Water-soluble vitamins
Vitamin B3 (Niacin)
NAD+ precursor
NAD/NADP cofactors; energy metabolism, DNA repair.
Upper-limit caution
The Tolerable Upper Intake Level for Vitamin B3 (Niacin) is 35 mg per day. Routine intakes above this level — counting food + supplements — raise the risk of adverse effects. Multivitamins, fortified foods, and standalone supplements stack faster than people expect.
How Vitamin B3 (Niacin) appears on labels
Supplement labels list Vitamin B3 (Niacin) under several names depending on the chemical form used. Any of these on an ingredients panel counts toward your Vitamin B3 (Niacin) intake:
- niacin
- vitamin b3
- vitamin b-3
- nicotinic acid
- nicotinamide
- niacinamide
- inositol hexanicotinate
Deep dive
For mechanism of action, dosing protocols, evidence grade, and interaction warnings on Vitamin B3 (Niacin), see the full encyclopedia entry:
Niacin (Vitamin B3) encyclopedia entry →Related water-soluble vitamins
Track your full intake
Formulate's free desktop app aggregates Vitamin B3 (Niacin) (and ~40 other nutrients) across every supplement in your stack — flagging underdoses, overlaps, and upper-limit overshoots in one view.
Get the appMedical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Targets and upper limits are general adult reference values; individual needs vary by age, sex, pregnancy status, and clinical context.