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FDA's 2024 review states the mechanism of action is still unknown, which limits how confidently any specific physiological effect can be predicted in humans

Effects can last a week or longer depending on your body and how often you get the injections

Vitamin A, for instance, can degrade when exposed to oxygen, while vitamin E may be affected by exposure to light and heat

Some clients benefit from weekly injections, while others may need them less often

Always consult a licensed healthcare provider before beginning any new treatment

Studies in hundreds of participants have found that higher blood levels of 1-methylnicotinamide (a marker related to NNMT activity) correlated with greater NNMT in adipose tissue, and were inversely related to insulin sensitivity