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Causes of deficiency may include a diet low in cysteine and other essential nutrients, increased pollution, excessive alcohol consumption, and certain medical conditions

Plasma concentrations of L-citrulline and L-arginine were significantly elevated immediately post-exercise and 30 minutes post-exercise following supplementation

References and citations RESEARCH CITATIONS [1] Pickart L, Margolina A

Preliminary data suggest that GHK-Cu can partially reverse age-related epigenetic changes, supporting the concept of "epigenetic rejuvenation." This line of research connects GHK-Cu with the broader field of reprogramming research and cellular aging