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Description
The enzyme NNMT normally changes nicotinamide, a form of vitamin B3, by using methyl groups, which lowers nicotinamide adenine dinucleotide (NAD+) levels

The mechanism is well-established
[DOI] [PubMed] [Google Scholar] 37.Akyol O, Zoroglu SS, Armutcu F, Sahin S, Gurel A

"They're going to have chemicals used in the purification process and fragments of peptides that you don't want." On platforms like TikTok, companies in China and other countries offer to ship dozens of peptide varieties to the U.S