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glutathione skin whitening randomized trial Full article: as an oral agent: A randomized, double-blind, placebo-controlled study A New Skin Lightening Procedure
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doi:10.3389/fnins.2022.874750

Injectable GHK-Cu offers systemic and often faster-acting effects, delivering higher bioavailability to deeper tissues

No long-term safety trial exists for injectable use

Such a metabolic landscape suggests that HGSC depends on cystine uptake to counteract high levels of iron-dependent oxidative stress and maintain redox homeostasis, thereby preventing ferroptosis-induced cell death [16]
