glutathione is safe to take Tablets For Skin Whitening: How Use, Benefits & Side Effects How to Take Glutathione Effectively:

These results demonstrate that the low molecular weight bioactive peptides contained in CPNS, such as Gly-Pro and Pro-Hyp, exert positive effects on skin hydration, elasticity, desquamation, and wrinkling

Abstract We report a simple surface functionalization of glutathione-capped gold nanoclusters by hydrophobic ion pairing with alkylamine followed by a complete phase transfer to various organic solvents with maintained colloidal stability and photoluminescence properties

The takeaway: oral glutathione supplementation can work, but form and delivery matter enormously

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Non-injectable (topical) formulations are Category 1 and eligible for compounding

BMC Biochem