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This vitamin is often added to foods like breakfast cereal, bread, or nutritional yeast known as fortified foods

Your body keeps a small amount in circulationroughly 200 nanograms per milliliter at age 20, dropping to under 80 by age 60

However, the risk of bone fractures may be increased by supplements containing 25 mcg or more daily, according to some research

showed that upregulation of surface CD38 leads to intracellular NAD + depletion, which induces mitochondrial alterations and increases oxidative stress (44)
