Beyond the Glow: A Critical Pharmacological Review of Glutathione in Skin Lightening

Background: Glutathione is an endogenous tripeptide with well-established antioxidant and detoxifying properties. In recent years, it has gained widespread popularity as a cosmetic skin-lightening agent, particularly in Asian and African countries, despite limited scientific evidence supporting its efficacy and safety. Objective: This review critically evaluates the pharmacological rationale, clinical evidence, safety profile, and ethical and regulatory concerns related to glutathione use for skin lightening. Methods: A narrative review of experimental studies, clinical trials, systematic reviews, and regulatory advisories was conducted to assess glutathione?s mechanisms of action in melanogenesis and outcomes following oral, topical, and parenteral administration. Results: Glutathione demonstrates plausible ant melanogenic mechanisms through tyrosinase inhibition, antioxidant activity, and modulation of melanin synthesis pathways. Oral and topical formulations show modest and inconsistent skin-lightening effects with acceptable short-term safety. In contrast, intravenous glutathione lacks robust clinical evidence and is associated with serious adverse effects. Conclusions: Current evidence does not support the routine use of glutathione as a primary skin-lightening agent. Parenteral administration poses significant risks and should be discouraged. Well-designed randomized controlled trials are required to establish efficacy, standardized dosing, and long-term safety. Categories: Dermatology, Pharmacology, Public Health.