Skincare Ingredients

Glycyrrhiza Glabra Root Extract

MVP Approved - Glycyrrhiza Glabra Root Extract is a botanical extract widely used for its skin-brightening, soothing, and dark spot reduction properties, with a low potential for irritation.

Glycyrrhiza Uralensis Root Extract

Glycyrrhiza uralensis (licorice) root extract is primarily a soothing/anti-inflammatory botanical used at low concentrations (typically well under a few percent) and is generally well-tolerated in sensitive-skin products, including those aimed at redness and eczema-prone users. Clinical experience and patch-test data suggest a low overall irritation rate, but as a complex plant extract it carries a small, real risk of irritant or allergic contact dermatitis in highly reactive individuals, so it cannot be scored as inert. Safety Notes: In mass-market leave-on products (lotions, toners, cleansers) Glycyrrhiza uralensis root extract is often used as a supporting soothing/brightening botanical at very low levels (≈0.01–0.1%), especially when it appears mid-to-late INCI and is part of a multi-extract blend. Dedicated brightening/anti-redness serums and creams sold OTC commonly use ~0.5–2% of the extract, while a small number of high-strength consumer products and ampoules list licorice root extract at ~3–5% (typically standardized extracts; higher levels are uncommon due to odor/color, potential tack, and batch-to-batch variability). Rinse-off products generally sit toward the low end because contact time is short, whereas leave-on formulas more often reach the upper end of the observed range.

Gold

In cosmetics, gold is typically used as colloidal gold, gold flakes, or gold salts at very low concentrations for marketing/optical effects rather than true barrier support. While metallic gold itself is relatively inert, gold compounds are well-documented causes of allergic contact dermatitis in patch testing, and reactions can be significant in eczema-prone or compromised skin. Given the non-essential benefit and credible sensitization/irritation risk in a sensitive-skin population, I score it as moderate. Safety Notes: In mass-market and prestige leave-on skincare (serums, creams, eye gels, sheet masks), gold is typically included at trace/marketing levels (often as colloidal gold or CI 77480) around ~0.0001–0.05%, with some products listing “gold” low in the INCI. High-strength consumer-available products (not prescription/pro-only), especially peel-off masks, luxury creams, and “24K gold” treatments using gold powder/flake or higher-load colloidal dispersions, can reach ~0.1–1.0% total gold-containing material; levels above ~1% are uncommon due to cost, aesthetics (visible particles), and stability/suspension constraints. Rinse-off products generally sit at the lower end because deposition is limited, while leave-on and peel-off formats are where the highest market levels are observed.

Gossypium Herbaceum Seed Oil

Gossypium Herbaceum (cottonseed) oil is a primarily emollient lipid used in leave-on products typically at a few percent up to higher levels, and it is generally well tolerated with low rates of irritation in patch testing for most users. However, as a natural triglyceride oil it can contain minor impurities/oxidation byproducts depending on refinement, and rare contact reactions can occur in highly reactive or eczema-prone patients, so it is not truly inert. For patient safety in compromised skin, I score it as very gentle but not zero. Safety Notes: In commercial skincare, cottonseed oil is often used at very low levels (~0.1–1%) as an emollient/solubilizing carrier within emulsions (lotions, creams, cleansers) and to support skin feel, especially when it is not a hero ingredient. At the high end, it is sold directly as a single-ingredient cosmetic oil and also appears as the predominant base oil in some body oils/balms, reaching 90–100% in leave-on products available to consumers. Rinse-off products typically sit toward the low-to-mid range due to surfactant dilution, while leave-on oils/butters can legitimately approach neat oil levels.

Grifola Frondosa Fruiting Body Extract

Grifola frondosa (maitake) fruiting body extract is typically used at low concentrations as a soothing/antioxidant, polysaccharide-rich botanical with generally good tolerability in leave-on products. However, as a complex fungal-derived extract it contains multiple bioactive fractions and can still trigger irritation or rare allergic reactions in highly reactive or eczema-prone patients, especially when the extract is less purified. Given this sensitization uncertainty despite low intrinsic irritancy, it fits best as a generally gentle ingredient rather than “very gentle.” Safety Notes: In commercial skincare, Grifola frondosa (maitake) fruiting body extract is most often used as a minor supportive botanical in multi-extract serums/creams/toners at very low levels (around 0.001–0.1%), consistent with typical supplier use-rates for standardized mushroom extracts and INCI placements near the end of lists. Higher-strength consumer products marketed around “mushroom/maitake” benefits (leave-on essences/ampoules/creams) and some mask formats can reach ~1–5% when the formula is built around the extract and tolerability/stability allows. Rinse-off cleansers typically sit toward the low end due to brief contact time and cost, while leave-on treatments span the full range.

Guaiazulene

Guaiazulene is a soothing, anti-inflammatory azulene derivative typically used at low concentrations (about 0.01–0.1%) in creams and after-sun or “calming” products. It is generally well tolerated and often included for redness reduction, but there are occasional reports of irritation or contact allergy in highly reactive or eczema-prone skin (especially in leave-on products with multiple botanicals). Given the low typical dose yet non-zero sensitization potential, I score it as gentle but not inert. Safety Notes: In commercial skincare, guaiazulene is frequently used as a color/soothing marker ingredient at trace levels (around 0.0001–0.01%) in creams, serums, and aftershaves where it mainly imparts a light blue tint and marketing story. Many consumer "azulene" soothing products sit in the ~0.01–0.1% range, while the upper end observed in OTC retail products is typically ~0.2% in targeted calming balms/spot products and sensitive-skin leave-ons; higher levels are uncommon due to strong coloration and potential for staining/instability rather than regulatory limits. Rinse-off cleansers generally use the low end of the range because of short contact time and color constraints.

Guar Hydroxypropyltrimonium Chloride

Guar Hydroxypropyltrimonium Chloride is a cationic guar-derived conditioning polymer used mainly in hair care and some cleansers/lotions at low levels (typically well under a few percent) to improve slip and reduce static. As a high–molecular weight film-former, it has minimal skin penetration and generally shows low irritancy in routine-use and patch test contexts, but cationic polymers can occasionally sting or trigger mild irritation on compromised or highly reactive skin. For patient safety in eczema-prone populations, I rate it as very gentle rather than exceptionally gentle. Safety Notes: In commercial consumer haircare and conditioning systems, guar hydroxypropyltrimonium chloride is commonly used at very low levels (~0.05–0.2%) for light detangling/slip in shampoos and rinse-off cleansers, with many INCI lists reflecting sub-0.5% usage. Higher levels are seen in richer rinse-off conditioners, co-washes, and some leave-on detanglers/creams where enhanced deposition and combability are targeted, reaching about 1.0–1.5% in high-slip/high-build OTC products (above this, viscosity, tackiness, and buildup typically become limiting).

Haematococcus Pluvialis Extract

Haematococcus pluvialis extract is primarily used as an antioxidant source (notably astaxanthin) and is typically included at low concentrations in leave-on products, where it is generally well tolerated. However, as a biologically derived algal extract, it can contain multiple constituents and is associated with occasional irritation or allergy in highly reactive or eczematous patients, especially depending on extraction solvents and formulation. Given the variability of botanical extracts and the need to protect compromised skin, I score it as gentle but not inert. Safety Notes: In mass-market leave-on skincare (serums, creams, eye products), Haematococcus pluvialis extract is often used at very low levels (around 0.001–0.05%) as an antioxidant/marketing extract, frequently via a diluted astaxanthin-containing carrier. Higher-strength consumer products marketed for “astaxanthin” antioxidant benefits (typically an oil dispersion or standardized extract) are commonly formulated around ~0.1–1%, with a practical upper end around ~2% in OTC leave-on products due to intense coloration, odor, cost, and solubility/stability constraints; rinse-off formats are usually toward the low end because of short contact time.

Hamamelis Virginiana Water

Hamamelis Virginiana Water (witch hazel distillate) is used as an astringent/soothing water phase in toners and cleansers, typically at high levels, and can contain tannins and volatile constituents that increase sting and barrier disruption in reactive skin. Clinical experience and patch/usage reports show it is a frequent trigger for irritation in eczema/rosacea-prone patients, and sensitization can occur depending on composition and co-occurring ethanol/fragrance in formulas. Given its common use across leave-on products and the risk profile in compromised skin, a moderate irritancy score is the safest benchmark-aligned assessment. Safety Notes: In commercial skincare, Hamamelis Virginiana (Witch Hazel) Water is often used at very low levels (~0.1–1%) as a minor soothing/astringent component in creams, cleansers, and toners where the base is primarily water or other botanicals. At the high end, consumer-available witch hazel toners/astringents and facial mists commonly use it as the primary solvent phase (often 50–90%+), with some products effectively being near-neat witch hazel distillate (approaching ~99%) depending on added humectants, preservatives, and/or alcohol. Leave-on toners/astringents are the main category reaching the highest concentrations, while rinse-off products typically sit at lower mid-range levels for tolerability and cost.

Haslea Ostrearia Extract

Haslea ostrearia extract is a microalgae-derived antioxidant/skin-conditioning ingredient typically used at low concentrations, and it is not a known primary irritant like acids or retinoids. However, botanical/marine extracts are complex mixtures with variable composition and are a recognized source of occasional irritation or sensitization in eczema-prone and highly reactive patients, even when marketed as “soothing.” Given limited robust clinical patch-test data specific to this extract and the need to err on patient safety, I rate it as mild with occasional sensitivity possible. Safety Notes: Haslea ostrearia extract (often standardized to the blue pigment marennine or sold as a microalgae extract blend) is typically used at very low levels in mass-market leave-on serums/creams (around 0.001–0.1%) for marketing/antioxidant/anti-pollution claims, and at similar or lower levels in rinse-off cleansers where deposition is limited. Higher-strength consumer products (concentrated “blue microalgae” boosters/ampoules and some niche masks/serums) can reach ~1–5% when supplied as a diluted extract solution or glycerin/water carrier, with practical limits driven by color impact, odor, stability, and cost rather than specific regulatory caps.

Hayflower Extract

Hayflower extract is a botanical mixture (commonly derived from meadow grasses/herbs) used for soothing/fragrance marketing at low concentrations, but it can contain multiple plant allergens (e.g., sesquiterpene lactones, phenolics) that are well-represented in patch-test datasets for allergic contact dermatitis. In patients with eczema or compromised barriers, these complex extracts have a clinically meaningful risk of both stinging/irritant reactions and delayed sensitization, especially when layered with other actives. Given the variability in composition and the non-essential nature of the ingredient, I score it as a notable sensitization-prone botanical requiring caution. Safety Notes: In commercial skincare, hayflower extract (often listed as Hayflower Extract/Heublumenextrakt, typically a glycolic or glycerinic extract) is commonly used at very low levels (~0.01–0.1%) in leave-on creams/lotions and soothing products primarily for marketing and mild sensorial/skin-feel support. Mid-range use (~0.2–2%) appears in botanical-heavy “alpine/herbal” moisturizers and body care. The upper end in OTC consumer products is observed in specialty spa-style body balms, massage creams, and concentrated herbal gels where supplier-recommended maxima and skin comfort typically cap practical use around ~5% (higher levels are uncommon due to odor/color load and irritation/sensitization risk from complex botanical constituents).

Hectorite

Hectorite is an inert clay mineral used primarily as a thickener/suspending agent in low-to-moderate concentrations (often ~0.5–5%) and is generally non-reactive on intact skin. Clinical experience and patch-testing data for cosmetic clays show very low intrinsic irritancy, with problems usually limited to mechanical dryness/tightness in highly compromised barriers or when used in leave-on products that absorb lipids. Given severe-sensitivity populations, I rate it as exceptionally gentle rather than fully inert to reflect the small but real risk of barrier-drying discomfort. Safety Notes: In commercial skincare and color-cosmetic products, hectorite (often as disteardimonium hectorite or stearalkonium hectorite) is used at very low levels (~0.05–0.3%) as a suspending/thixotropic aid in low-viscosity serums, sprays, and some emulsions, especially when paired with other rheology modifiers. Typical leave-on creams/lotions, masks, and gel products more commonly sit around ~0.5–5% depending on the targeted yield value and sensory. The highest OTC consumer-available uses are seen in clay-heavy purifying masks and some makeup bases where total hectorite/clay structurant load can reach ~10–15% to build strong structure and oil/impurity adsorption; rinse-off products can tolerate the upper end more readily than elegant leave-ons.

Hedera Helix Extract

Hedera helix (ivy) extract is a botanical additive typically used at low concentrations for soothing/toning claims, but it contains saponins and polyacetylenes that have been associated with irritant reactions and occasional allergic contact dermatitis in patch-test and case-report literature. In sensitized or eczema-prone skin, botanicals with this profile can provoke stinging, erythema, or flares, especially when layered with other actives or on a compromised barrier. Given the documented irritation/sensitization potential despite low use levels, a moderate score with patch-testing is the safest clinical assessment. Safety Notes: In mass-market leave-on moisturizers, toners, and eye products, Hedera helix (ivy) extract is typically used as a low-level soothing/anti-oxidant botanical or part of a multi-extract blend, often in the ~0.001–0.1% active extract range. Higher levels are observed in consumer-available body firming/anti-cellulite gels, massage creams, and “slimming” products where ivy is a hero botanical, commonly around 0.5–3% and occasionally up to ~5% depending on extract type/strength and sensory/tolerance limits. No specific FDA/EU maximum applies to the botanical itself, so practical market use is mainly constrained by supplier use-level guidance, odor/color impact, and irritation potential in leave-on formats.

Helianthus Annuus Seed Cera

Helianthus Annuus (sunflower) Seed Cera is a plant-derived wax used primarily as an emollient/structuring agent in balms, sticks, and creams, typically at low-to-moderate concentrations to increase viscosity and occlusivity. As an inert lipid-wax mixture it has a low rate of irritation in patch testing and clinical use, but it is not completely risk-free in highly reactive or eczematous skin (rare intolerance/contaminant-related reactions), so it scores as very gentle rather than inert. Safety Notes: Helianthus Annuus Seed Cera (sunflower seed wax) is used at very low levels (~0.05–0.5%) as a viscosity/structure aid in emulsions and leave-on lotions/creams, and around 0.5–5% in stick products, balms, and butters to build body and improve payoff. In high-structure anhydrous consumer products (lip balms, deodorant sticks, solid balms, and some waterless salves), it can be pushed into the ~10–20% range as a primary structuring wax; higher levels are generally limited by hardness, drag, and crystallization/texture control rather than regulation (no specific EU/FDA maximum for this cosmetic wax).

Helianthus Annuus Seed Oil

Helianthus Annuus (Sunflower) Seed Oil is primarily an emollient/occlusive lipid used at relatively high concentrations in moisturizers and cleansers, and it is generally well-tolerated in patch testing with low irritancy rates. However, in severely compromised barriers (e.g., active eczema) and in rare cases of contact allergy to seed-derived components or oxidation byproducts in aged oils, mild reactions can occur. Given sensitive-skin safety considerations, it fits best as very gentle rather than completely inert. Safety Notes: In commercial skincare, Helianthus Annuus (Sunflower) Seed Oil is used at very low levels (~0.1–1%) as an emollient/solvent or to help disperse oil-soluble ingredients in lotions, serums, and cleansers (both leave-on and rinse-off). Mid-range use (2–30%) is common in creams, balms, and cleansing oils where it contributes slip and barrier support. The high end includes anhydrous body oils and single-ingredient carrier oils sold to consumers that can be 95–100% sunflower seed oil, so the observed OTC market maximum reaches 100%.

Helianthus Annuus Seed Oil Unsaponifiables

Helianthus Annuus (sunflower) seed oil unsaponifiables are the minor lipid fraction (e.g., phytosterols, tocopherols) used at low levels to support barrier function and reduce dryness, and they are generally well-tolerated in sensitive and eczematous skin. Clinical and patch-test experience suggests a low irritation rate compared with many botanical extracts, but as a plant-derived lipid fraction it still carries a small risk of contact allergy or intolerance in highly reactive individuals, so it is not scored as completely inert. Safety Notes: In commercial leave-on skincare, Helianthus Annuus (Sunflower) Seed Oil Unsaponifiables are most often used as a minor lipid-active fraction (tocopherols/sterols) at low levels (~0.05–0.5%) to support barrier and antioxidant claims in emulsions and serums. Higher-strength consumer products (typically richer creams, balms, and lipid concentrates) use dedicated “unsaponifiables” fractions at ~1–5% when positioned as a primary actives blend, with practical upper limits driven by supply/formulator convention and sensorial/waxiness rather than specific regulatory caps. Rinse-off formats generally sit toward the low end because benefits are contact-time limited and the fraction is costly relative to bulk oils.

Helianthus Annuus Seed Wax

Helianthus Annuus (sunflower) seed wax is a non-volatile, occlusive structuring agent/emollient used at low-to-moderate levels in balms, sticks, and creams, and it is not an active with pH-dependent irritancy. Clinical experience and patch testing trends for plant-derived waxes show low irritation potential, though rare reactions can occur due to trace impurities or individual allergy. Given sensitive-skin safety priorities, it merits a very gentle score rather than inert. Safety Notes: In commercial leave-on products (lotions, creams, serums, sunscreens, and makeup) Helianthus Annuus Seed Wax is often used as a minor structurant or texture modifier at ~0.05–1%, with very low levels also appearing in multi-wax systems where it mainly supports feel and stability. Higher levels (typically 5–15%) are seen in anhydrous balms, stick products (lip balms, solid moisturizers), and high-wax pomades where it functions as a primary hardening/structuring wax; consumer-available specialty sticks/balms can reach ~20–25% when combined with other waxes/butters. Use at the high end is overwhelmingly in leave-on anhydrous formats rather than rinse-off products, which generally keep wax levels low to avoid deposition and rinsing issues.

Helianthus Annuus Sprout Extract

Helianthus Annuus (sunflower) sprout extract is primarily used as an antioxidant/soothing botanical at low concentrations, and sunflower-derived materials are generally well-tolerated in leave-on products. However, as a plant extract it contains a complex mix of proteins and phytochemicals that can trigger irritation or rare allergic reactions in eczema-prone or highly reactive patients, especially with compromised barriers and cumulative exposure in multi-step routines. Given this low-but-nonzero sensitization/irritation potential compared with inert humectants, it fits a gentle (not exceptionally gentle) score. Safety Notes: Helianthus Annuus (Sunflower) Sprout Extract is typically used as a marketing/antioxidant-support botanical in leave-on serums, lotions, and eye products at trace levels (often below 0.01%) when supplied as a preserved, glycerin/propylene glycol carrier extract and listed low on the INCI. Higher-strength consumer products (especially “sprout/antioxidant” concentrates and some K-beauty style ampoules) can reach around 0.5–2% active extract addition, with >2% uncommon due to cost, odor/color impact, and limited evidence that higher dosing improves performance; rinse-off uses tend to sit at the low end because of short contact time.

Heptyl Glucoside

Heptyl glucoside is a non-ionic alkyl polyglucoside surfactant/solubilizer typically used around ~0.5–5% in cleansers and micellar-type formulas, where surfactant contact can disrupt the stratum corneum. APG surfactants are generally milder than sulfates, but clinical experience and patch/usage data show they can still cause stinging, dryness, or eczema flares in compromised or highly reactive skin—especially with frequent use or when combined with other cleansing agents. Given its surfactant function and cumulative barrier effects in real routines, I score it as mild with occasional sensitivity risk. Safety Notes: Heptyl glucoside is a mild nonionic alkyl polyglucoside surfactant/solubilizer most often used in rinse-off cleansers, micellar waters, and cleansing oils; in leave-on emulsions or sprays it is typically present at low solubilizing levels (~0.05–1%). In consumer-available rinse-off formulas (facial/body cleansers, shampoos, foaming hand washes), it is commonly used in the ~1–8% active range as part of a surfactant blend, with higher-strength “concentrated” or low-water cleansers reaching about 10–15% active without being professional-only. There is no specific EU/FDA maximum concentration set for heptyl glucoside; practical upper limits are driven by irritation potential, viscosity/salt response, and clarity/stability in the chosen system.

Hesperidin

Hesperidin is a citrus-derived flavonoid antioxidant/vasoprotective used at low levels in topical formulas (commonly ~0.1–2%) and is generally well-tolerated in clinical use with low rates of irritation in patch testing compared with acids, retinoids, or fragrance components. While sensitization is uncommon, botanical origin and potential impurities mean reactive eczema patients can still flare, so I score it as very gentle rather than exceptionally gentle. Safety Notes: In commercial skincare, hesperidin (typically as hesperidin or hesperidin methyl chalcone) is most often used in leave-on eye/anti-redness and “circulation” formulas at very low levels around 0.001–0.1% due to solubility and color/stability constraints. The highest OTC consumer-available products observed (targeted vascular/dark-circle/anti-bruising creams and specialty serums) reach about 1–2% total hesperidin-type flavonoid, generally in leave-on systems using solubilizers/encapsulation; rinse-off products are uncommon and usually sit at the low end because contact time is short.

Hesperidin Methyl Chalcone

Hesperidin methyl chalcone is a flavonoid derivative used mainly for vascular-support/anti-redness and antioxidant benefits, typically at low concentrations (about 0.1–1%) in leave-on products. Human experience and patch-test data suggest low inherent irritancy and low sensitization risk, but as a bioactive polyphenol it can rarely provoke stinging or dermatitis in highly reactive or eczematous skin. Given the sensitive-skin population and cumulative routine exposure, it fits best as very gentle rather than inert. Safety Notes: In commercial OTC skincare, Hesperidin Methyl Chalcone is most often used in leave-on eye/circulation-targeted products at low levels (~0.01–0.1%) as part of anti-dark-circle/anti-puffiness complexes (often paired with dipeptide/caffeine). Higher-strength consumer-available serums and vascular/redness-support creams can reach ~0.5–2%, with a small number of specialized OTC formulations listing up to ~3% as a primary active; above this becomes uncommon due to solubility, color/odor, and stability constraints. Rinse-off products, when they include it, generally sit toward the low end because contact time limits benefit.

Heterotheca Inuloides Flower Extract

Heterotheca inuloides (Mexican arnica) flower extract is used as a botanical soothing/anti-inflammatory agent, but like many Asteraceae (Compositae) extracts it carries a meaningful risk of irritant or allergic contact dermatitis, especially in eczema-prone or highly reactive patients. Reported sensitization to sesquiterpene lactones and related constituents, plus variability in extract composition, makes reactions plausible even at typical low leave-on concentrations. Given the potential for delayed sensitization and real-world cumulative exposure in routines, I score it as moderate and patch-testing is prudent for sensitive skin. Safety Notes: In commercial skincare, Heterotheca inuloides (Mexican arnica) flower extract is most often used as a minor soothing/antioxidant botanical in leave-on products (creams, serums, after-sun, post-procedure calming) at trace-to-low levels around 0.001–0.1%, consistent with typical supplier recommended use levels for standardized extracts. Higher-strength OTC products marketed for redness relief, bruising/irritation support, or botanical “active” positioning (often gels/balms/spot products) can use it at ~1–5% when formulated as a glycerin/propylene glycol extract or concentrated botanical solution; this upper end reflects observed consumer-available specialty formulations rather than typical mass-market usage.

Hexanoyl Dipeptide-3 Norleucine Acetate

Hexanoyl Dipeptide-3 Norleucine Acetate (often marketed as a mild “peptide exfoliant”/skin-smoothing signal peptide) is typically used at low concentrations (about 0.5–2%) and is generally well tolerated in patch testing compared with true acids or retinoids. However, because it is designed to influence desquamation/skin renewal and is delivered in a lipophilic (hexanoyl) form that can increase skin interaction, reactive or barrier-impaired patients can experience mild stinging or erythema, so it cannot be scored as exceptionally gentle or inert. Safety Notes: Hexanoyl Dipeptide-3 Norleucine Acetate (commonly marketed as a micro-exfoliating/renewal peptide in leave-on serums and creams) is typically dosed at very low levels because it is supplied as a dilute active and is used for signaling/enzymatic exfoliation rather than bulk functional effects; commercial products at the low end often sit around ~0.0005–0.005% active. High-strength consumer-available “peptide peeling/renewal” serums and targeted treatments generally top out around ~0.05% active due to cost, sensitization risk, and diminishing returns, with rinse-off formats usually using similar or lower levels because of reduced contact time.

Hexapeptide-11

Hexapeptide-11 is a synthetic signal peptide used in anti-aging products at very low concentrations (typically well below 0.1–1%), and peptides as a class have a low rate of irritant reactions in clinical and consumer patch testing. It is not pH-dependent and is generally non-stinging and compatible with compromised skin when properly formulated, though rare irritation can occur due to individual reactivity or formulation context (e.g., solvent/preservatives), so it is not scored as completely inert. Safety Notes: In commercial INCI lists, Hexapeptide-11 is most often used in leave-on anti-aging serums/creams at very low levels (commonly around 0.0005–0.01%), frequently as part of a peptide blend, with the lowest observed use around 0.0001% when included mainly for marketing or as a minor component of a complex. The highest OTC consumer-available claims and supplier-use practices for neat peptide actives put Hexapeptide-11 up to ~0.05% in high-strength leave-on peptide serums and concentrated ampoules; above this is uncommon due to cost and formulation/stability constraints. Rinse-off usage is rarer and typically stays at the low end because short contact time limits benefit.

Hexapeptide-47

Hexapeptide-47 is a synthetic signaling peptide used in very low concentrations (typically well under 1%) to support barrier/anti-aging or calming claims, and peptides as a class show low irritancy in repeat-insult patch testing and clinical use. While true irritation is uncommon, any bioactive peptide can rarely trigger stinging or dermatitis in highly reactive or eczematous skin, so I do not score it as inert. At typical use levels and neutral formula pH, it is generally very gentle with a low but non-zero risk for compromised skin. Safety Notes: In commercial leave-on products (serums/creams/eye products), Hexapeptide-47 is most often used at very low levels typical of specialty peptides, with some formulas listing it at trace “label-claim” amounts around 0.0001–0.001% when supplied as a diluted peptide-in-solvent blend. Higher-strength consumer products that position peptides as a primary active generally top out around ~0.01–0.05% active Hexapeptide-47 due to cost, solubility, and stability constraints (peptides are commonly used well below 0.1% active in OTC skincare). Rinse-off usage is uncommon and, when present, tends to sit at the low end because of limited contact time.

Hexapeptide-48 Hcl

Hexapeptide-48 HCl is a small synthetic signaling peptide typically used at very low concentrations (generally well under 1%) in anti-aging/soothing formulations and is not pH-dependent like exfoliating acids. Available safety and patch-test experience with cosmetic peptides suggests a low rate of irritation or sensitization, with most reactions more often attributable to the overall formula rather than the peptide itself. Because it is a hydrochloride salt and still a bioactive peptide (rare idiosyncratic reactions are possible in highly compromised skin), I rate it as very gentle rather than inert. Safety Notes: Hexapeptide-48 HCl is a specialty signaling peptide typically supplied as a diluted aqueous/glycerin solution, so finished-product usage in commercial leave-on serums and eye/face creams is often very low (down to ~0.0001% active when brands include it as part of multi-peptide blends or at trace ‘label claim’ levels). High-strength consumer-available leave-on treatments that position a single peptide as a hero ingredient generally top out around ~0.1% active due to cost, solubility/stability in water phases, and diminishing returns above typical peptide dosing. It is uncommon in rinse-off products; when used, levels are usually at the low end because of limited skin contact time.

Hexyl Benzoate

Hexyl Benzoate is primarily an emollient/solvent and fragrance-adjacent ingredient used at low-to-moderate levels to improve slip and product feel. It is generally well tolerated with low rates of irritation in leave-on products, but as an aromatic ester it can still provoke mild stinging or contact reactions in highly reactive or eczematous skin, especially when layered with other potential irritants. Given sensitive-skin safety priorities, I rate it as gentle rather than very gentle. Safety Notes: Hexyl benzoate is most commonly used as a low-level emollient/solvent and fragrance component in leave-on lotions/creams and color cosmetics, where it is frequently present around 0.05–1% as part of a broader ester/emollient blend. In oil-based or anhydrous consumer products (facial oils, makeup primers/foundations, lip products, and some sunscreen/skin-feel modifier systems), it can be used as a primary emollient/texture agent and reach ~10–25% in high-slip, ester-heavy formulations available at retail. There is no specific EU/FDA maximum limit for hexyl benzoate as a cosmetic ingredient; practical upper use is driven by sensorial targets, solvency needs, and overall oil-phase balance rather than regulatory caps.

Hexyl Cinnamal

Hexyl cinnamal is a fragrance ingredient (perfuming allergen) typically used at low concentrations in leave-on and rinse-off products, but it is a well-documented cause of allergic contact dermatitis in patch testing populations. In patients with eczema or impaired barriers, even low-level fragrance allergens can trigger significant irritation or delayed sensitization, so I score it as significant risk for sensitive skin routines. Safety Notes: Hexyl Cinnamal is a fragrance allergen used primarily as part of perfume compositions; in commercial products it is often present only as an impurity/trace within a fragrance blend, with finished-product levels commonly around ~0.00005–0.01% in lightly scented or “fragrance (parfum)” products. In strongly scented consumer products (fine-fragrance-adjacent body lotions, body sprays, and fragranced hair/body washes), finished-product concentrations can reach the low tenths of a percent, with the upper end around ~0.3–0.4% observed in high-fragrance, OTC leave-on and rinse-off items. Practical upper limits are driven more by IFRA/brand allergen management and scent profile than by a fixed global regulatory maximum, and leave-on products typically target lower levels than rinse-off when sensitization risk management is prioritized.

Hexyldecanol

Hexyldecanol is a long-chain fatty alcohol used mainly as an emollient/slip agent and co-emulsifier, typically at low-to-moderate concentrations in leave-on products. Fatty alcohols of this type are generally well tolerated in patch testing and are not common primary irritants, but they can occasionally provoke stinging or dermatitis in highly reactive or eczema-prone skin when barrier function is impaired. Given the low intrinsic reactivity yet non-zero risk in compromised skin, it fits a very gentle score rather than inert. Safety Notes: Hexyldecanol is most often used as an emollient/texture and slip modifier in leave-on creams/lotions, sunscreens, and makeup at low levels around 0.05–1% (often part of a fatty alcohol/emollient blend). In richer barrier creams, balms, sticks, and anhydrous oil phases it can be pushed into the mid-to-high single digits, with some consumer-available high-slip anhydrous/balm formats reaching ~10–15% when it functions as a primary emollient component. Rinse-off products typically sit at the low end because it’s mainly used for skin feel and phase structuring rather than cleansing performance.

Hexylene Glycol

Hexylene glycol is a solvent/humectant used typically around ~0.5–5% (sometimes higher) to improve texture and enhance penetration. Clinical and patch-test data generally show low irritation at common levels, but it can sting or irritate compromised skin (eczema, barrier disruption) and around the eyes, especially in leave-on products or when paired with other irritants. Given its known potential for irritant contact dermatitis in reactive patients despite being widely tolerated, I rate it as mild rather than “gentle.” Safety Notes: Hexylene glycol is used in consumer skincare primarily as a solvent/humectant and preservative-booster, and it often appears at low levels (~0.1–1%) in leave-on creams/serums and many rinse-off cleansers where it supports solubilization and sensory. In higher-solvent systems (toners/essences, makeup-removing liquids, exfoliant/active solutions), commercial OTC products commonly reach ~3–5% and, more rarely, up to about 10% where stronger solvency and antimicrobial-boost effects are needed. Hexylene glycol is not subject to a specific EU/FDA maximum for cosmetics, so the practical upper end is typically set by irritation/sensory limits and formula compatibility rather than a hard regulatory cap.