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For anyone seeking the most evidence-supported, accessible anti-aging intervention, NAD+ precursor supplementation has a stronger foundation

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BUT: If you want the most accurate baseline B12 level: Overnight fast preferred Avoid liver and supplements for days before Regular meat consumption the day before has a minimal effect The bigger concern is B12 supplements , not dietary meat, which can dramatically alter results

GRAS simply means the FDA agrees that the substance, at intended use levels as a food additive or supplement, is safe based on common use history or expert opinion and does not pose acute toxicity concerns