http://www.smartskincare.com/treatments/topical/vitcderiv.ht...

is this to do with baseline solutions as vehicles for vitamin C??

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Note added at 14 mins (2012-12-11 15:41:35 GMT)
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look at this:

http://naturalskinstore.com/vitaminc.html

Although Vitamin C is widely used in dietary supplements. *****Its use in dermatologicals and cosmetics has been inhibited due to its lack of stability in the vehicles employed in these products.***** This important use can now be implemented on the basis of the availability of L-Ascorbic Acid Polypeptide, the stable form of ascorbic acid. Vitamin C+ has a pronounced toning and firming effect on the skin, making it suitable as an ingredient in cosmetics intended for use in the vicinity of the eyes (reduction of puffiness, etc.) as well as skin care products for aging and mature skin.

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Note added at 16 mins (2012-12-11 15:43:24 GMT)
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and here

lack of stability in aqueous solutions


http://books.google.co.uk/books?id=jFurh7g1Uz8C&pg=PA710&lpg...

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Note added at 16 mins (2012-12-11 15:43:39 GMT)
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I don't think the Portuguese is that clear, FWIW.