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Do you take a B complex vitamin or exclusively B3?

Taking any single B vitamin can deplete other B vitamins. It is best to take a B Complex as a baseline and add to that.

Not all B vitamins have a wide safety profile, so I consider this poor advice if your goal is to get to 3 g/day of B3.

Do you have citation specific for B3?

Just niacinamide—non-flushing B3.