What is the shelf life of L-ascorbic acid?

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• A. Testing has shown that once opened a product may lose 2% in 6-8 month, however that it is still effective and the product is still viable. (Some have stated that the shelf life of ascorbic acid is only 3 weeks and that there is none left after 3 months since the concentration drops by 10%. This is simply not accurate). Vitamin C Facts • L-ascorbic acid is the only form of Vitamin C that the body can recognize and utilize. • A product must have a pH lower than 4.0 in order to be effective and penetrate the skin. • A product must have a minimum of 10% L-ascorbic acid in order to create change in the skin (for eye area levels higher than 5% are not recommended). However, skin cannot utilize more than 17.5% L-ascorbic acid. • Powder or crystal forms of L-ascorbic acid that are mixed with diluents can be effective. However, formula can vary, as it can be difficult to get a homogeneous solution with this method. • The stabilization of L-ascorbic acid is relative. When L-ascorbic acid ... more
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