Hoya Lacunosa Flower Extract

Hoya Lacunosa Flower Extract is a botanical extract used mainly for marketing/sensory and potential antioxidant/soothing claims, typically at low concentrations, but it is not a standardized, well-characterized therapeutic active. Like many plant extracts, it contains complex mixtures of small molecules that can trigger irritant or allergic contact dermatitis in reactive or eczema-prone skin, and reliable human patch-test data are limited. Given the uncertainty and the higher baseline risk of botanicals in sensitized populations, I rate it as mild with occasional sensitivity possible. Safety Notes: Hoya Lacunosa Flower Extract is a niche botanical typically supplied as a diluted glycerin/propylene glycol/butylene glycol extract and is most often used at trace-to-low levels for marketing/skin-conditioning in leave-on products (serums, essences, creams), with some formulas listing it below 0.01% consistent with late-INCI placement. In consumer products positioned as “extract-forward” or single-hero botanical (often in watery toners/essences or lightweight serums), inclusion can reach around 0.5–2.0% active extract (as supplied), above which sensorial impact, odor/color, and preservation burden typically limit use; rinse-off products generally sit at the low end due to limited benefit from higher loading. No specific FDA/EU maximum is set for this botanical extract, so practical formulation constraints and market practice drive the observed upper bound.