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Therefore, highly dynamic ratio of cystine/cysteine couple in vivo can explain the discrepancy with in vitro phenotype
The regulatory situation in the US remains unsettled as of 2026, so access through an accredited compounding pharmacy under physician supervision is essential, and competitive athletes subject to WADA testing should not use it
Scientific and analytical testing
doi:10.1159/000158636 [PubMed] [Karger] Koenig G, Seneff S
The most common side effects include dryness, mild irritation, or increased sensitivity to sunlight
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