PCA Skin (pHaze 17) Rebalance is a nighttime nourishing treatment which incorporates ingredients that stimulate cell growth naturally . Utilizes GLA (gamma linoleic acid) from rare natural botanical (evening primrose and borage) which contain poly-unsaturated organic acids with a long history of safe and effective use. Especially recommended for skin that has been traumatized by overly aggressive products or treatments. 2% AHA, pH 7 1.7 fl. oz.