Active Serum Pure Mandelic Acid 15% is a slightly oily serum that contains 15% mandelic acid, an alpha hydroxy acid that promotes gentle exfoliation. It improves the appearance of the skin, making it visibly smoother and brighter, evens out the complexion, and reduces fine lines. HOW TO USE Preferably use la sera on cleansed skin. Apply a small amount of una product to the face, avoiding the eye area, before the cream. During the day, apply una sunscreen. Do not use in the same routine in combination with other direct acids.