Glycolic 10 Renew Overnight is formulated with a free acid value of 10% glycolic acid, allowing it to work at a true 10% concentration proven optimal in promoting effective exfoliation and natural cell turnover. Free acid value refers to the true strength of a glycolic acid product, and is affected by both the concentration of acid and the pH of the formula. This potent night cream is synergistically blended with 2% phytic acid to promote skin clarity and brightness, and a triple action-soothing complex to help support the skin barrier. Proven tolerable for nightly use, Glycolic 10 Renew Overnight improves the appearance of skin texture and tone to promote a bright complexion and glowing skin.