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Conversion is fine for most healthy younger adults, but can be less efficient in people with MTHFR genetic variants (an estimated 25 to 40% of the population carries at least one variant), people with liver function decline (more common with age), and smokers and former smokers

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Effects on cellular NAD+ and SAM pools in vitro

For long-term storage, it should be stored at -80 in deep cold and avoid repeated freezing and thawing

For those living in New York City, where fast-paced lifestyles and unhealthy diets are more prevalent, the need for proper nutrition is even greater

10.1186/s13098-019-0484-0 107 PicardF.KurtevM.ChungN.Topark-NgarmA.SenawongT.Machado De OliveiraR.et al (2004)