Food and Drug Administration
NNMT is overexpressed in adipose tissue of obese subjects, and its inhibition has been explored as a strategy to modulate methyl group flux and NAD+ precursor availability
Fermented foods (such as tempeh), nori, spirulina, chlorella algae, and unfortified nutritional yeast cannot be relied upon as adequate or practical sources of B-12.39,40 Vegans must regularly consume reliable sourcesmeaning B-12 fortified foods or B-12 containing supplementsor they could become deficient, as shown in case studies of vegan infants, children, and adults
If you are on these medications, the providers can assess your risk and recommend appropriate supplementation
doi:10.1093/nutrit/nuu011