![]() We have better news regarding the three magic abilities of vitamin C: there is in-vivo (tested on real people) data showing that SAP does have photo-protective (aka antioxidant) properties, though less than pure AA. Regarding conversion to AA, there seems to be no data about it, so we can neither deny nor confirm it. ![]() Unfortunately, it seems to be limited, or to quote a great article from the Journal of Cosmetic Dermatology "topically applied ascorbyl phosphate salts are, at very best, poorly absorbed in comparison with AA". The challenge with it though is skin penetration. SAP (the vit C derivative, not the enterprise software, obvs) is a promising derivative that has great stability up to pH 7.
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