Random, interesting studies
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 Topical Oxidized Vitamin C (DHA) permeates through skin 12x faster than ascorbic acid. Even though the human study below is from a company that produced the product with DHA, it seems to be very carefully done with practical considerations. 
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 @Lejeboca yes I saw that one too but hadn't clicked on it. Thanks for sharing. 
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 Sorbitol I'd be careful with sorbitol. The issue with sorbitol is that it is often made with a nickel catalyst, which leaches into the endproduct. " The Cr/Fe promoted system exhibits the highest activity but the Fe leaches from the catalyst into the reaction mixture. Moreover, this catalyst deactivates after successive runs. For all Raney-type Ni catalysts leaching of Ni in the product mixture occurs." 
 https://www.sciencedirect.com/science/article/abs/pii/S0920586103000403?via%3DihubAlthough Ray said a little is ok: Post 28 Title: Bryan · Feb 4, 2013 at 5:00 PM Author: Bryan Post Content: Me: Is sorbitol o.k. to eat? I got some gummy bears that have it in them. Peat: A little is o.k. 

