Vitamin

Niacin

Niacin requires 14 mg daily for adult women and 16 mg for men. The tolerable upper intake level is 35 mg from supplements.

Last reviewed: 2026-09-20Reviewed by: StackingRight clinical reviewPrimary source

What Niacin does

Supports NAD/NADP-dependent energy metabolism and DNA repair.

The UL applies to supplemental nicotinic acid and nicotinamide.

How much you need

Reference intakes for Niacin in adults
MeasureAdult maleAdult female
Recommended intake16 mg14 mg
Upper intake level35 mg (supplemental only)
Typical supplement dose1 capsule

Interactions involving Niacin

0 sourced rules

No interaction rules are currently recorded for Niacin. That does not mean none exist — it means none met the sourcing bar for inclusion.

Questions people ask about Niacin

Sources