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NAD+ doesn't do any of this
[Google Scholar] 5.Lehmann H.C., Wunderlich G., Fink G.R., Sommer C
Adults need around 2.4 micrograms (mcg) of vitamin B12 a day

doi: 10.1016/j.jcis.2020.09.081
In many cases, it will involve diet, exercise, and prescription weight loss medication like Semaglutide.
