Geri-Hydrolacâ„¢ is a dual-action moisturizer that helps to exfoliate and soften the elbows knees feet and hands. It contains a gentle alpha hydroxy acid (AHA) ammonium lactate which sloughs off old skin cells to reveal smoother and fresher-looking skin. Geri-Hydrolacâ„¢ can be used to treat a number of dry skin conditions including eczema icthyoses and psoriasis.