Editor, Science of NAD
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Can Niacin Boost NAD Levels?
Niacin is the first form of Vitamin B3. It works sometimes, but not always, and there are issues...
PROs: Niacin is inexpensive, easily available, good in some cell types
CONs: Niacin causes uncomfortable flushing, is toxic at higher doses, and cannot do much for some cell types, like neurons, or for some situations, like coronavirus infection.
Although Niacin may be the least expensive and most easily available of the NAD precursors, it might do the least for you. First, you may already be getting moderate amounts in your diet anyway. Second, you can't take large amounts without risking multiple types of toxicity. Third, it may not be available at the times and places when you need it most, like your brain and during a viral infection.