glutathione peroxidase antioxidant is an enzyme and cell protector Insights into the Role of
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D.McMahanW

J Environ Manag 307:114521 Ali B, Xu X, Gill RA, Yang S, Ali S, Tahir M, Zhou W (2014) Promotive role of 5-aminolevulinic acid on mineral nutrients and antioxidative defense system under lead toxicity in Brassica napus

closest topical glutathione-family evidence, not reduced GSH. Topical plus oral glutathione showed skin-whitening activity in a double-blind randomized controlled trial
What actually matters is whether you can tolerate the injection consistently enough to maintain the protocol long-term
doi: 10.1053/meta.2001.24914

It is extensively studied in preclinical models for its role in cellular protection, signaling pathways, and tissue-specific stress response research
