glutathione dangers What Is Glutathione? Health Benefits, Risks, and More FDA Advisory No. 2019-182 ||
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So should you just take more vitamins

Cysteine, unlike most other amino acids, is extremely unstable and rapidly autoxidizes to cystine which is the oxidized disulphide form

We also test each batch for any possible additives, contaminants, and impurities to ensure the highest level of quality.
Also, it has been shown that GSH reduced peripheral vascular endothelium-dependent vasodilation, in patients with atherosclerosis by increasing NO activity [150]