How much niacin (B3) do I need per day?

Most adult men need 16 mg NE per day and most adult women need 14 mg NE per day. Pregnancy is typically 18 mg NE per day and breastfeeding is typically 17 mg NE per day.

What foods are highest in niacin?

Common strong sources include poultry, fish, lean meats, peanuts, mushrooms, and fortified grains.

What does NE mean for niacin?

NE stands for niacin equivalents. It accounts for niacin from food plus niacin your body can make from tryptophan.

Do I need a niacin supplement?

Most people do not. High-dose niacin supplements are sometimes used medically, but they should not be used casually.

Why does niacin cause flushing?

Some forms and doses of supplemental niacin can cause skin flushing and warmth. It is dose-related and is a common side effect of supplements, not food.

Can you get too much niacin?

Yes, mainly from supplements. The tolerable upper intake level for adults is 35 mg per day for supplemental forms that cause flushing. Medical dosing is different and requires supervision.

Is niacin linked to cholesterol supplements?

Yes. Some products use high-dose niacin. Do not take these without clinician guidance due to side effects and safety concerns.

What is the easiest niacin strategy this week?

Add a repeatable protein anchor and one plant option like peanuts or mushrooms a few times per week. Track the pattern and keep the habit.

Niacin (Vitamin B3)

Niacin (vitamin B3) supports energy metabolism by helping your body run key reactions that convert food into usable energy. It also supports skin and nervous system function. Most people get enough niacin from protein-rich foods and fortified grains. The main niacin issue is not food deficiency, it is supplement misuse. High-dose niacin supplements can cause flushing and can be unsafe without medical supervision.

Supports energy metabolism and normal nervous system function
Supports skin and digestive system maintenance
Often found in poultry, fish, meats, peanuts, and fortified grains
Your body can make some niacin from the amino acid tryptophan
High-dose niacin supplements can cause flushing and other side effects

Try BeyondCal for free

How BeyondCal helps you track niacin

Track niacin automatically from logged foods and meals
See your rolling average over time after you log food
See how far you are from your daily target
Find which meals contribute most to your niacin intake

Exact values and your gap are shown in the app after you log food.

See this in the app

What this helps with

What niacin works with

Adequate protein supports niacin intake and also provides tryptophan, which can be converted to niacin in the body
Riboflavin and vitamin B6 support parts of the pathway involved in converting tryptophan into niacin
Overall diet variety often raises multiple B vitamins together, not just niacin

Playbook

Raise it fast

Fastest ways to raise niacin with food

Use a protein anchor consistently: poultry, fish, lean meat, or legumes. Many niacin sources are protein-rich
Add peanuts or peanut butter as a repeatable snack if it fits your calories and allergies are not a concern
Use mushrooms as a regular side, since they can contribute meaningful niacin for a vegetable
If you eat grains, fortified options can add niacin, but do not rely on ultra-processed foods as the plan
If you are tempted by high-dose niacin supplements, pause. Those are a medical tool, not a casual wellness add-on

Food swaps

Simple swaps that make niacin easier to hit

Low-protein lunch -> add chicken, tuna, tofu, or beans as the base
Candy snack -> peanut butter with fruit, or peanuts with fruit
No veggie side -> mushrooms as a side or mixed into meals
Refined grain base -> choose a more nutrient-dense grain or fortified option sometimes
Skipping meals -> keep a simple protein habit so B vitamins do not crash from low variety

Timing tips

Practical niacin rules

Niacin is water-soluble, so consistent intake matters more than big doses
Food sources are usually enough. Supplements at high doses can cause flushing and other issues
If you take a B-complex, check your niacin dose. Some products stack multiple forms
If you have liver disease, diabetes, gout, or take certain meds, do not use niacin supplements without clinician oversight

Absorption blockers and interactions

What can block or reduce absorption

What can create issues

High-dose niacin supplements can cause flushing and can be unsafe without medical guidance
Very high supplemental niacin can affect liver function in some people
Certain health conditions and medications change supplement risk, so self-dosing is a bad idea
Repetitive low-protein diets can reduce niacin intake because many niacin-rich foods are protein-rich

If you eat like this, watch out

You should pay extra attention if

Your diet is low in protein variety and relies heavily on refined carbs
You avoid both animal proteins and legumes and your diet is low variety
You drink alcohol heavily or have poor overall diet quality
You take B-complex products or "cholesterol" supplements that include niacin
You have liver issues, diabetes, or gout and are considering supplements (get clinician guidance)

Track together

Niacin is easiest to interpret with your overall protein intake and the rest of the B vitamins. If multiple B vitamins are low, the problem is usually diet structure and food variety, not one isolated nutrient.

Related nutrients

FAQ

Sources

Disclaimer: Educational only, not medical advice. Talk to a qualified clinician for personal guidance.

Read full disclaimer

The information provided is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Individual nutrient needs vary by age, sex, health status, medications, and other factors. High-dose niacin supplements can cause flushing and can have serious side effects, including effects on liver function, blood sugar, and uric acid. If you have liver disease, diabetes, gout, take medications, are pregnant, or are considering niacin supplements for cholesterol or any medical purpose, consult a qualified healthcare provider. BeyondCal helps you track intake from food logs, but it does not replace professional medical advice.