Ganoderma Lucidum Extract

Ganoderma lucidum (reishi) extract is primarily used as an antioxidant/soothing botanical at low concentrations (typically well under a few percent) and is generally well-tolerated in routine cosmetic use. However, as a complex fungal extract (mixture of polysaccharides/triterpenes and potential residual proteins depending on processing), it carries a non-zero risk of irritation or allergic contact dermatitis in highly reactive or eczema-prone patients, especially with leave-on use. Given limited standardized patch-test data across preparations and the variability between extracts, I score it as gentle but not “very gentle” for compromised skin. Safety Notes: In mass-market leave-on products (creams/lotions/toners/cleansers), Ganoderma Lucidum Extract is frequently used at very low levels (around 0.0005–0.1%) as a label claim/antioxidant-support botanical within broader blends, consistent with typical supplier recommended use rates for standardized mushroom extracts. Higher-strength OTC serums/ampoules and “mushroom-focused” products marketed around reishi commonly formulate at ~0.5–2%, with the upper end (~3–5%) seen in niche consumer concentrates where the extract is a primary featured active (often dependent on extract type/solids and solvent system). Rinse-off formats tend to sit toward the low-to-mid end due to cost and limited contact time, while leave-on formulas more often occupy the mid-to-high end when positioned for soothing/anti-redness or antioxidant benefits.