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Heres why this matters: B12 injections are most beneficial for people with a diagnosed deficiency or absorption issue

This is more common in the case of vitamin B12

Over the following 6 to 8 days, the concentration gradually declines as your body metabolizes the compound, primarily through hepatic pathways that do not interact with cytochrome P450 enzymes

Weaker bones can put more stress on joints, ligaments, and muscles

As Kannt & Pfenninger highlight in Frontiers in Physiology , maintaining NAD levels is a cornerstone of metabolic health, supporting mitochondrial function and improving resistance to metabolic stress (Kannt & Pfenninger, Frontiers in Physiology )