Skin Functional - 5% Hydroxypinacolone Retinoate Serum 30ml AirlessBest Way To Use Slowly introduce into an evening routine, starting with application three times a week and gradually increase application frequency. Apply two to three drops in the evening to face, neck and dcolletage. Do not use with other retinoid products. Suitable Skin Types Combination Oily Say Goodbye To Dullness poor complexion Textural irregularities Uneven skin tone Fine lines and wrinkles Contraindications Alpha Hydroxy Acids, Beta Hydroxy