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Over-supplementing can be harmful as well, especially for B6, since high doses over time may be linked to nerve damage, and studies show that getting too much of either type of B vitamin may be detrimental to bone health

NAD is necessary for: Cellular energy production DNA repair Metabolic function Longevity and cellular vitality As we age, natural NAD levels decline , which can contribute to fatigue, slower metabolism, and reduced cellular repair

It participates in over 500 enzymatic reactions and is essential for energy production, DNA repair, and cellular signaling

There is inconclusive evidence linking very high or very low levels of vitamin B12 to cancer risk