Some older studies have evaluated NAD+ at high doses (1-2g daily) for conditions such as chronic schizophrenia, but no improvement was noted in these studies.3 This may be because NAD+ is expected to have poor oral bioavailability.12 For this reason, when trying to boost NAD+ levels using an oral route, precursors such as nicotinamide or nicotinamide mononucleotide are typically used instead of NAD+
Lasting tiredness can have many causes beyond B12, such as iron levels, thyroid issues, or sleep problems, and a check-in helps make sure you are treating the right thing
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In summary, NaBPC157 could interfere with the NO-effects in both gastric mucosal integrity and blood pressure maintenance in a particular way, especially when combined with L-arginine, having a more prominent and/or particularly different effect on NO