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N., Sun, L., Rahman, M
Compared with native GLP-1 which has a half-life of only a couple of minutes because the enzyme DPP-4 rapidly inactivates it semaglutide carries an Aib substitution at position 8 that resists DPP-4 cleavage, plus a C18 fatty-diacid side chain that binds albumin and extends its half-life to about a week
Daneshpour et al
Supplement companies originally tried using niacin (which we've added below) as well as "NR" (nicotinamide riboside) to increase NAD+, but it turns out that NR is converted to NMN anyway, [46,52] making it costly and more wasteful
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