vitamin-c-serums
Vitamin C Suspension 23% + HA Spheres 2%
This product uses the gold-standard L-Ascorbic Acid in a stable, water-free suspension that prevents oxidation, but it lacks the stabilizing Vitamin E and Ferulic Acid found in the 'Duke Parameters.' While the 23% concentration is high and potentially irritating, and the texture is notoriously gritty, its stability in a tube and extremely low price point make it an excellent budget-friendly alternative to expensive serums.
Sources & References
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