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100 mg/mL is the most common compounded NAD+ concentration because it allows convenient dosing across the typical therapeutic range (20 to 200 mg per injection) with low injection volumes

The honest boundary is that even the coherent pairing is a mechanistic hypothesis with no human validation, so the most defensible research posture is to study the single compound at its documented dose first, and treat any combination as a further, clearly-labelled research question rather than a default

B12 injections for fatigue are most effective when fatigue is genuinely rooted in low B12

You may need two to three injections over several weeks to notice peak impact for mild deficiencies