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C20 Ferulic L-Ascorbic Acid Serum Keep the cap tight andOur original 20% L ascorbic acid serum, boosted with ferulic acid and hyaluronic acid. Blended in small batches and hand dated so the vitamin C reaches your skin at full strength, not months past its prime. Why fresh matters L ascorbic acid is the most studied, most effective form of vitamin C and the least stable. Once it's mixed, it slowly oxidizes into a form your skin can't use. That's why a serum bottled months ago on a warehouse shelf isn't the