*** A CONSULTATION IS REQUIRED IN ORDER TO PURCHASE THIS PRODUCT 5% Mandelic Serum is an alpha hydroxy acid serum that contains the chirally correct versions of both L-Mandelic Acid and L-Lactic Acid. These key ingredients offer exfoliating properties and can help diminish the appearance of discoloration. Niacinamide offers antioxidant support for the skin. This water-based serum is appropriate for all skin types when 8% Mandelic Serum cannot be tolerated. Safe for use on skin prone to all types of acne and can be used on skin that is not prone to acne. Mandelic acid has a larger molecular weight than other alpha hydroxy acids, slowing down epidermal penetration resulting in a more even exfoliation with less irritation. Apply 2 to 3 pumps all over a clean face or affected area.