Vitamin B3
Vitamin B3 is a moderate-risk supplement with an RDA of 16 mg and a tolerable upper intake level (UL) of 35 mg per day according to NIH/NASEM standards. CNS lists a RDA of 15 mg with the same UL. Use NutriAudit to check if your supplement stack keeps this ingredient within safe limits.
Quick take
Vitamin B3 sits in the B Vitamins category. This page consolidates 4 regional standards, and the limits vary enough that you should not treat one region's rule as universal.
For this ingredient, the main task is usually not a binary yes/no question but checking the label dose, your total intake, and possible overlap with the rest of the stack.
Taking multiple supplements? Check Vitamin B3 for overlap
If Vitamin B3 appears on two product labels, enter each daily amount and check the combined label total.
Check Vitamin B3 across my supplementsFree. No account required.
Overdose Risk Warning
High-dose vitamin B3 (niacin) can cause flushing and liver stress.
Regional Reference Values
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| 🇺🇸 United States | FDA | 16 | 35 | mg |
| 🇪🇺 Europe | EFSA | 16 | 35 | mg |
| 🇦🇺 Australia | TGA | 16 | 35 | mg |
| 🇨🇳 China | 中国营养学会 | 15 | 35 | mg |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level; some authorities have not established one.
How to use this page
First match your product label against the dose table above, then check whether the known interaction list includes anything in your current stack.
If you are taking multiple supplements, the safest approach is usually to audit the whole stack instead of judging a single bottle in isolation.
Frequently Asked Questions
How much Vitamin B3 is too much?
FDA lists a formal upper limit (UL) of 35mg per day for Vitamin B3. Other regions may use a different value or have no established UL.
What is the recommended daily dose of Vitamin B3?
The RDA for Vitamin B3 is 16mg per day for most adults. This amount is sufficient to meet the needs of 97-98% of healthy individuals.
Are you taking Vitamin B3?
Check if your supplement stack keeps Vitamin B3 within safe limits.
Audit My SupplementsDisclaimer: NutriAudit is a decision-support tool designed to help you review your supplement stack for potential duplicate, conflicting, or excessive ingredients. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your supplement routine, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Uses cited public reference data where the current dataset has a verified entry.