Unique Retinol encapsulated delivery system provides maximum release with reduced irritation typically associated with retinoid use. Retinol diminishes the appearance of fine lines and deep wrinkles by stimulating collagen production. Additionally, Retinol stimulates cell regeneration to enhance skin tone and texture and to reduce the appearance of discolorations, age spots, and occasional blemishes. 2.5% retinol. Strongest amount you can get without a prescription.