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Unlike direct NAD+ supplements, these precursor compounds are better absorbed and more effectively transported into cells, resulting in higher NAD+ levels

Proponents argue this maintains more stable tissue levels, though others find once-daily dosing equally effective with better compliance

doi: 10.3389/fimmu.2017.01908 119 ItohTFairallLAminKInabaYSzantoABalintBLet al

There are several B12 supplements available in the market
