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As a recent scientific review explains, 4 Owing to its size and charged nature, NAD+ cannot passively pass through cellular membranes, including the plasma membrane. ...this probably occurs indirectly through the generation of NAD+ degradation products, such as NMN, NR or NAM, which act as precursors. In other words, NAD+ taken orally must first be broken down into these smaller molecules before it can re-enter cells and contribute to NAD+ synthesis

Instead, they use different mechanisms of action which are part of the innate immune system

If you are deemed suitable for treatment, hydroxocobalamine 1mg will be prescribed

Im pretty sure I put in 150 milligrams of vitamin C