when determining ascorbic acid by titration against 2,6-dichlorophenolindophenol. We have accordingly investigated the rate of oxidation of ascorbic acid in 5 per cent metaphosphoric acid solution ...

Of all the vitamin-C options, our experts generally recommend looking for serums that contain ascorbic acid, also known as L-ascorbic acid, which is the most active and purest form of vitamin C.

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