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It does not approve an indication, dose, route, duration, combination, or claim of patient benefit

NCBI Pugliese et al

Tryptophan is also used by our body to produce the sleep hormone melatonin [5] , which is essential for the internal biological clock to function properly

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Common Concentrations Used in Published Research Published in-vitro work commonly uses GHK-Cu at concentrations between 10 nM and 10 M in fibroblast culture, with 1 M representing a frequently reported working concentration [2][3]