glutathione tyrosinase Modulating skin colour: role of the thioredoxin and systems in regulating melanogenesis Identification of Catechol-Type Diphenylbutadiene as

Anti-aging and longevity peptides Epithalon: Standard shelf life: 28-30 days refrigerated Maximum: 30-35 days Short peptide sequence, stable Thymosin Alpha-1: Standard shelf life: 28-30 days refrigerated Maximum: 45 days (pharmaceutical grade) Relatively stable peptide Semax and Selank: Standard shelf life: 28-30 days refrigerated Maximum: 30-35 days Short peptides, stable Sexual health peptides PT-141 (Bremelanotide): Standard shelf life: 28-30 days refrigerated Maximum: 45 days (pharmaceutical Vyleesi) Stable peptide Melanotan II: Standard shelf life: 28-30 days refrigerated Maximum: 35-40 days Relatively stable Copper peptides (GHK-Cu) GHK-Cu injectable: Standard shelf life: 28-30 days refrigerated Maximum: 30 days (copper can catalyze oxidation) More sensitive than other peptides due to copper ion Special note: Copper peptides may show visible degradation (color change to greenish/blue) if stored too long

Histamine binding to H 2 receptors can activate PKA and induce tyrosinase pathway, and therefore melanogenesis process (Malaviya et al., 1996

Purity Testing and Quality Assurance Analytical testing remains one of the most important aspects of peptide sourcing

J Biol Chem 244(22):60496055