Core stack: Glutathione + gentle brighteners + ceramides/panthenol
2 L-Glutathione The Master Antioxidant L-glutathione, often referred to as "the master antioxidant," is a tripeptide made from three amino acids: glutamate, cysteine, and glycine
References Noctor G, Mhamdi A, Chaouch S, Han Y, Neukermans J, Marquez-Garcia B, Queval G, Foyer CH

Additional Caution May Be Appropriate If You: Have highly sensitive or reactive skin Are prone to allergies or cosmetic skin irritation Have rosacea-prone skin Are currently utilizing strong exfoliating acids or active skincare ingredients Have a compromised, damaged, or irritated skin barrier Avoid Cosmetic Application To: Broken skin Open wounds Severely irritated areas Areas experiencing active irritation or heightened sensitivity Cosmetic Formulation Considerations Lower introductory concentrations are commonly preferred when beginning new cosmetic peptide formulations Patch testing is recommended before larger cosmetic application areas Gradual introduction into cosmetic skincare routines is generally preferred Formulation compatibility with other active skincare ingredients should be considered If uncertain whether a cosmetic peptide formulation is suitable for a specific skincare routine, consultation with a qualified skincare professional may be considered prior to cosmetic use

doi: 10.1111/ejn.15676 157
Furthermore, intravenous glutathione (12 injections of 1,200 mg) showed no benefit for skin lightening compared to placebo in a Pakistani study (Zubair et al., J Pakistan Assoc Dermatol, 2016) [64]