They concluded current evidence of the skin-whitening effect of glutathione is still inconclusive however there is a trend that glutathione might brighten skin colour at sun-exposed area. A review specifically focusing on topical glutathione (and melanogenesis) found that though topical forms (e.g., GSH 0.5% vs 0.1%) had more effect, the studies were small, short term and lack longterm data
doi: 10.1111/1756-185x.12820 9
Some groups have spreadsheets comparing 40 different Chinese suppliers by price, shipping time and claims of purity. Most of the compounds arrive as white powder in unmarked vials with labels reading not for human consumption . Buyers mix them with bacteriostatic water, draw doses into insulin syringes bought on Amazon and inject them subcutaneously, guided by TikTok tutorials or Reddit threads
In finished products, this also creates a formulation concern: oxygen, heat, and carrier-oil quality can affect product stability
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[DOI] [PubMed] [Google Scholar] 103.Liu P, Xue Y, Zheng B, Liang Y, Zhang J, Shi J, Chu X, Han X, Chu L
