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Amino acids are generally used by the body for protein synthesis and/or as a neurotransmitter.

For example, GHK suppresses gene ACBC1 (ATP-binding Cassette) by 1,536% but only suppresses a similar gene ACCB4 by only 70%

Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I by CJC-1295 in animal models. Journal of Clinical Endocrinology & Metabolism , 91(3), 799805

A phase I clinical trial in patients with advanced colorectal cancer found that doses up to 3.6 g/day for four months were well tolerated, although the systemic bioavailability of oral curcumin was low (77)