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Agsin in their guidelines
White C, Ji S, Cai H, et al (2012) Therapeutic potential of vasoactive intestinal peptide and its receptors in neurological disorders
Known to stimulate collagen production and improve skin elasticity, GHK-Cu plays a key role in promoting smoother, firmer skin and accelerating wound healing
See the Supplementary for further details on the MRS methods
These same findings have been replicated in a sleep study involving elderly monkeys, who also exhibited a significant increase in the night plasma melatonin following administration of either epithalamin or epithalon