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European Journal of Pharmacoly 2002
Through that reporting, we arrived at some metrics for the ideal formula: a vitamin C concentration of 5% to 20% an ideal pH for each specific type of vitamin C derivative we tried reliably effective derivatives of vitamin C Ultimately, we picked products that contained the following derivatives or modified versions of the chemical compound: L-ascorbic acid (sometimes labeled as ascorbic acid) is considered the gold standard for absorption, and it is especially effective when paired with additional ingredients like vitamin E and ferulic acid
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