Most cosmetic chemists target 0.025%–0.3% active retinol in finished formulas, depending on the delivery system. Encapsulated retinol can be dosed at the higher end because the capsule wall delays exposure to oxygen and skin enzymes. Potency should be confirmed by HPLC testing at 0, 3, 6, and 12 months. AJ Cosmo Labs connects you with formulators who specify and validate these concentration ranges routinely.
Read the full guide on Retinol stabilization →