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L-Ascorbic Acid is water-soluble and works at the skin surface, directly inhibiting tyrosinase

The GSH and GSSG concentrations in 15 commercial YDs of 6 different brands were measured (Figure 2)

doi: 10.1089/ars.2021.0063 131 TianSWangMLiuCZhaoHZhaoB

Transparency is the whole game in a market with no retail pharmacy oversight

Journal of Clinical Psychopharmacology, 21 (3), 335-339

The severity and duration of deficiency are perhaps the most significant factors
