Flash Skin Tips #4 DIY SKINCARE? Think again.
The Science Behind Vitamin C Serum Formulations
Stability
L-ascorbic acid is the active molecule from raw vitamin C which works on skin. It is also highly unstable, meaning it gets oxidised rapidly upon exposure to environmental oxygen. Once it is oxidised, it is rendered useless. By default, all vitamin C serums are packaged in an amber glass bottle to minimise oxidation by light as well. The best vitamin C serum formulations get around this problem by:
Increasing the concentration of L-ascorbic acid to ensure there is still a sufficient amount that works on skin taking into account the oxidation process
Ensuring the companion ingredients have anti-oxidant properties i.e. green tea extracts can synergise and boost the effectiveness of L-ascorbic acid
Instead of L-ascorbic acid, vitamin C can be formulated as a salt known as sodium ascorbyl phosphate (SAP) which is highly stable and resistant to oxidation.
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