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Even with B12 in the diet, absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age and with certain medications
Especially recommended for individuals with heavy workloads, chronic stress, or emotional exhaustion
The page is built around comparison and decision support, with the highest-value checks sitting around the main claim, safety boundary, and next practical step
That is what makes NAD+ a systemic lever, a way to support the cellular energy and repair machinery broadly rather than in one isolated spot
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