Use twice weekly at night. Apply a small amount all over face after cleansing, leave on and allow to absorb. No rinsing required. Complete your nightly routine with the Reversaderm Collagen Accelerator Serum and Reversaderm Cellular Regeneration Cream. Cleanse face the following morning with Reversaderm Glycolic Cleanser. A light tingling sensation and cold feeling can occur as the product activates, this is normal but rinse immediately if the tingly becomes too uncomfortable. The intensity of the sensation may increase if serum or cream is applied before the peel has fully absorbed into the skin. We recommend patch testing before use. For external use only. Avoid contact with eyes. If contact occurs, rinse immediately. Alpha Hydroxy Acids can make skin sensitive to the sun, so we recommend using a sunscreen in conjunction with this product.