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A small molecule inhibitor of nicotinamide N-methyltransferase for the treatment of metabolic disorders

Allometric scaling: Using the FDA's standard body surface area conversion (rat dose x 0.162), the human equivalent range is roughly 110-560 mcg/day -- which is where the community's 250-500 mcg/day window comes from

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Neuroscience Letters Pickart (2008) "The human tri-peptide GHK and tissue remodeling." Published in Journal of Biomaterials Science

10.1371/journal.pbio.3001025 227 WangL.LiuY.DuT.YangH.LeiL.GuoM.et al (2020b)

They are manufactured for laboratory use only and are explicitly labeled not for human use. Research-grade peptides are not regulated by the FDA