Allantoin Glycyrrhetinic Acid

Allantoin Glycyrrhetinic Acid is typically used as a soothing/anti-irritant complex (allantoin plus glycyrrhetinic acid from licorice) at low concentrations in barrier-support and post-procedure products. Both components are generally well-tolerated in clinical use, with glycyrrhetinic acid showing low irritancy in standard cosmetic concentrations, though rare contact allergy to licorice-derived constituents can occur in highly reactive individuals. Given its intended calming function and low sensitization rate but acknowledging non-zero allergy potential, it fits best as very gentle rather than inert. Safety Notes: In commercial OTC skincare, this soothing/anti-irritant complex is typically present at very low levels (~0.01–0.1%) in mass-market creams, toners, aftershaves, and cleansers where it functions as a supportive calming agent rather than a primary active. Leave-on sensitive-skin serums, post-procedure recovery products sold to consumers, and targeted redness/spot-care formulas can reach ~0.5–2.0% total, reflecting the upper end seen in high-strength OTC offerings (higher levels are uncommon due to solubility, sensory, and stability constraints). Rinse-off products generally sit toward the low end because contact time is short and higher loading offers limited incremental benefit.