side effects of high dose glutathione as a skin whitening agent: Facts, myths, evidence and controversies Glutathione Side Effects: Everything You

Given that there is no placebo-controlled human data, no established dose, and a mechanism whose foundational papers were retracted, an absence of noticeable effect is fully consistent with the current evidence it does not necessarily indicate a defective product, the wrong route, or an insufficient duration

Mao S, Wang L, Zhao X, Guo L, Lin Q, Wang X, et al

In normal red blood cells, pentose phosphate pathway and glycolysis are enhanced and G6PD is sufficient to produce NADPH efficiently for GSSG reduction and maintenance of GSH pool (311)

While direct glutathione from food doesnt absorb well, you can eat foods that help your body produce more glutathione

PMID: 7065145

Common sites are the abdomen or thigh