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Loren Pickart, who pioneered much of the research, suggested that GHK-Cu levels decrease significantly with age (1), although the exact extent of this decline varies across studies

The circadian protein period 1 contributes to blood pressure control and coordinately regulates renal sodium transport genes

Vitamin B12 deficiency occurs when the body does not have enough vitamin B12 to support normal health

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Competition for Vitamin B12 by intestinal parasites or bacteria