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NAD+ (Nicotinamide Adenine Dinucleotide) is a vital coenzyme found in all living cells, playing a central role in cellular energy metabolism , DNA repair , and mitochondrial function

Absorption issues: Some people, particularly those with gastrointestinal disorders or aging adults, may have trouble absorbing vitamin B12 through the digestive system

This section directly addresses the critical gap between animal research and established clinical efficacy

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