[DOI] [PMC free article] [PubMed] [Google Scholar] McFarland A
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Vitamin B12 deficiency may contribute to neurological symptoms such as numbness, tingling, reduced sensation, and peripheral neuropathy, as well as megaloblastic anemia caused by impaired red blood cell production
Rare serious adverse events: pancreatitis, gallbladder disease, acute kidney injury
Because it works at the cellular level restoring NAD+ so fat cells become metabolically active again changes tend to be gradual and build over weeks, and they show up best alongside solid nutrition, training, and the rest of your plan
Many people are comfortable with that distinction and find value in it