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In a pilot trial of NAD+ intravenous infusion in healthy adults, subjects receiving 750 mg of NAD+ over 6 hours reported no negative symptoms, and there were no vital sign abnormalities or serious laboratory derangements compared to placebo

That said, my experience and thousands of user reports suggest quality oral tablets/capsules can work

[DOI] [PubMed] [Google Scholar] 85

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6 S0 applies to pharmacological substances that are not addressed by another section of the List and do not have current approval by a governmental regulatory health authority for human therapeutic use

subsequent doses should be administered at the recommended intervals