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Foods such as avocados, spinach, broccoli, and garlic are excellent sources of the amino acids needed for glutathione synthesis
Understanding these pathways helps explain why certain peptide stacks work better than individual compounds, and why timing and sequencing affect outcomes so dramatically
Research status Not FDA-approved
Xiao B, Xu Z, Viennois E, et al
The recommended dose is 480 mg twice daily
While retinoids increase photosensitivity and require careful sun avoidance, GHK-Cu protects keratinocytes from lethal UV-B radiation and blocks UV-induced erythema without making skin more sensitive to sun exposure
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