vitamin-c-serums
Vitamin C Serum
While highly popular and stable, this serum uses Sodium Ascorbyl Phosphate (SAP) rather than the gold-standard L-Ascorbic Acid (L-AA) prioritized in clinical research for collagen synthesis. It earns a silver tier for being an excellent, non-irritating option for sensitive skin, but it falls short of gold due to the use of a dropper bottle and a less potent C-derivative.
Sources & References
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