This is not a settled question
Schilling Test: The flushing dose is 1000 mcg
Even in healthy controls without any supplementation blood glucose and insulin resistance correlate positively with NAD metabolites
A handful of studies have linked vitamin C intake to a lower risk of several cancers
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Most recently, a randomized, placebo-controlled trial in 40 obese men (ages, 40-70 years) found that daily supplementation with nicotinamide riboside (2,000 mg/day divided into two daily dosages) for 12 weeks was associated with reports of only minor side effects, including excessive sweating, pruritus, and mild gastrointestinal symptoms like bloating (139)