ghk-cu injection vs topical “Is actually worth it?” is genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, GHK-Cu Peptides Before and After:

AOD 9604 has an excellent safety profile and recently obtained Human GRAS status in the USA

The Chang study provides a mechanistic complement to the in vivo tendon-healing findings reported by Krivic and colleagues

Melanin biology = weeks to months Dose well below studied ranges (e.g., under 250mg) minimal supporting research at very low doses No ALA or NAC in formula these co-factors are commonly included to support glutathione regeneration, though not strictly mandatory No FSSAI number on label illegal in India Prices below 300/month raw material cost makes this difficult at consistent quality Clinical Research: What Studies Actually Show Rather than relying on marketing claims, here's a brief summary of the published research most relevant to oral glutathione and skin brightening: Oral glutathione and skin pigmentation Arjinpathana & Asawanonda (2012), Journal of Dermatological Treatment , found that subjects taking 500mg/day oral glutathione for 4 weeks showed a significant reduction in melanin index compared to placebo in a double-blind randomised trial

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It doesn't significantly increase cortisol or prolactin, hormones that often rise with other secretagogues