You may take care of the issue of instability in a number of ways- utilizing powdered vitamin C that may be blended at residence recent (fiddly), maintain it at low pH (lower than 3.5), use a vitamin C spinoff that will probably be extra secure (however perhaps much less efficient) like Magnesium Ascorbic Phosphate or formulate it with one thing like silicone, which could be very unreactive.
The Odd Vitamin C Choices-
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– “what is the best vitamin c from the ordinary”
“what is the best vitamin c from the ordinary”