Moreover, derivatives not only have to be absorbed into the skin, they also have to be converted into pure AA. What is not so good is that, as the great review study about vitamin C derivatives in the Journal of Cosmetic Dermatology writes, MAP is "at very best, poorly absorbed in comparison to AA." MAP does solve the stability problem: it's stable up to pH 7, so far so good. Chamomilla Recutita (Matricaria) Flower Extract
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