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Additionally, recent studies have identified bacterial DNA in human and mouse adipose tissues 20,21

Journal of Peptide Research

A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default

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The reduced precursors NRH and NMNH show promise in overcoming this, although preclinical evidence for health benefits is still limited, and whether their efficacy on functional readouts would be superior to the classic counterparts NR and NMN is also unclear