is 50mg glutathione effective - an overview Intercellular antioxidant support | Glutathione,

Sadly, as you mention, theres no guarantee who youre actually buying from (unless youre specifically shopping the manufacturers store on Amazon), and you may be getting products that are past their expiry date, with no recourse from the manufacturer

No insurance billing, no enrollment fees, no annual contracts

Biochim Biophys Acta 1812:888892 Chen R, Mias GI, Li-Pook-Than J, Jiang L, Lam HY, Miriami E, Karczewski KJ, Hariharan M, Dewey FE, Cheng Y, Clark MJ, Im H, Habegger L, Balasubramanian S, OHuallachain M, Dudley JT, Hillenmeyer S, Haraksingh R, Sharon D, Euskirchen G, Lacroute P, Bettinger K, Boyle AP, Kasowski M, Grubert F, Seki S, Garcia M, Whirl-Carrillo M, Gallardo M, Blasco MA, Greenberg PL, Snyder P, Klein TE, Altman RB, Butte AJ, Ashley EA, Gerstein M, Nadeau KC, Tang H, Snyder M (2012) Personal omics profiling reveals dynamic molecular and medical phenotypes

This typically points to storage failure during shipping