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VITAMINS
Niacin (nicotinic acid)
Nicotinic acid is a form of vitamin B3 that supports energy metabolism.
Also known as: vitamin B3, nicotinic acid, niacinamide, nicotinamide, flush niacin, niacin (nicotinic acid)
At a glance
- Form
- Nicotinic acid
- Category
- Vitamins
- In an apiece formula
- 25 mg a day (you can change it)
- Recommended intake
- 14 mg (women), 16 mg (men)
- Upper limit
- 35 mg a day from supplements and fortified foods
- Studied for
- Heart & metabolic health, Energy & vitality*
- Reference
- NIH ODS: Niacin fact sheet
Who should be careful
Our safety rules leave niacin out of a formula, or keep the amount lower, with:
Medicines and supplements
- Statin
- Beta blocker
- ACE inhibitor or ARB
- Potassium-sparing diuretic
- Thiazide water pill
- Loop water pill
- Water pill
- Other blood pressure medicine
- Nitrate
- Lactulose or rifaximin
- Hepatitis B or C medicine
Health conditions
- Alcohol use disorder
- Liver disease
- Cirrhosis or advanced liver disease
- Gout
Life stage
- Pregnancy
- Breastfeeding
- Trying to conceive
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Other forms of niacin
- Niacinamide
Niacinamide is a non-flushing form of vitamin B3 that supports energy metabolism and healthy skin.
Questions
How much niacin a day?
apiece formulas usually include 25 mg a day. The recommended intake for adults is 14 mg (women), 16 mg (men). Upper limit: 35 mg a day from supplements and fortified foods.
What is niacin used for?
Nicotinic acid is a form of vitamin B3 that supports energy metabolism. In apiece it is part of formulas for Heart & metabolic health, Energy & vitality.*
Who should be careful with niacin?
apiece’s safety rules leave it out or limit it with: Statin; Beta blocker; ACE inhibitor or ARB; Potassium-sparing diuretic; Thiazide water pill; Loop water pill; Water pill; Other blood pressure medicine; Nitrate; Lactulose or rifaximin and others. Check with your doctor or pharmacist if any apply to you.
Can I get niacin in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. Niacin can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.