Get 50% Back, After $100 M2 Purchase (mail-in rebate) Expires May 31, 2013 - Print Rebate Form Eliminate all your skin care woes with one easy-to-use serum. M2 Skin Refinish 20% (High Potency) is a multi-purpose facial treatment that uses a potent combination of Mandelic and Malic Acids to rapidly even skin tone, reduce breakouts, and soften wrinkles. (Previously known as MaMa Lotion)