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Iron deficiency can result from inadequate dietary intake, poor absorption, or increased iron requirements during pregnancy or growth
Exercise: Combine resistance and cardiovascular training, scaled to your goals

They also have an impact on NAMPT levels 6 , which fluctuate to meet cellular NAD+ demand

(Hydrochloric acid separates B12 from the protein it's attached to in food

Therefore, further investigation is required to determine optimal safe and efficacious doses of the currently clinically available NAD + precursors