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The even better news: side effects from vitamin B12 supplements are usually mild, says Richard Foxx, M.D., a board-certified physician who treats hormonal disorders and nutritional deficiencies

The recommended dose of general health is to start out with 0.1ml (20mg NAD+) and, as desired, slowly ramp up to 0.4ml (100mg NAD+) 1-3 times per week

Potential Side Effects and Limited Human Data While preclinical studies have not shown significant toxicity at standard doses, the research in humans is still in its early stages

Measure Oral bioavailability Published finding 38.4% in rats What it means Shows that some oral absorption occurred in that model

If you have one of those conditions, getting B12 injections can prevent a deficiency before it starts

Rare but Serious Adverse Effects Even though rare, serious side effects can happen