Vitamin B3 explained:
niacinamide vs niacin, and
what the flush really means.
Vitamin B3 helps every cell in your body turn food into energy. It comes in two main forms: niacin, which can make your face go warm and red, and niacinamide, which does the same vitamin job with no flush. Here’s what B3 does, how the two forms differ, which is the best form, how much you need, the signs of low B3, and the best Indian foods for it.
Niacin vs niacinamide: the short answer
What is the difference between niacin and niacinamide?
Niacin (nicotinic acid) and niacinamide (nicotinamide) are two forms of vitamin B3. Your body turns both into NAD, a helper that more than 400 enzymes need. The difference: niacin can cause a warm, red flush at about 30 to 50 mg or more, and niacinamide does not. The flush is harmless and is not a sign that a supplement is working.
If a tablet has ever made your face turn warm, red and tingly, that was the niacin flush. It comes from one form of vitamin B3, called nicotinic acid. The other form, niacinamide, gives your body the same vitamin without the flush, which is why it is the form most daily multivitamins use.1
What vitamin B3 does in your body
What is B3 vitamin for?
Vitamin B3 helps your cells turn food into energy. Your body turns it into NAD and NADP. More than 400 enzymes need these helpers, more than for any other vitamin-made helper. They let your cells turn food into energy, build fats and cholesterol the body needs, and repair DNA.
Think of NAD as a tiny rechargeable battery inside every cell. It picks up energy from the food you eat and carries it to where the cell makes its fuel. Your body builds NAD from vitamin B3, and more than 400 enzymes depend on it.1
NAD does more than carry energy. Cells also use it to repair DNA and to switch genes on and off.2
These jobs are recognised in European food law. Niacin has approved claims for normal energy-yielding metabolism, the reduction of tiredness and fatigue, a normal nervous system, normal psychological function and normal skin.3
“Niacinamide and niacin become the same helper inside your cells. One of them just skips the red face on the way there.”
The one-line difference
The two forms of vitamin B3, side by side
What is the best form of vitamin B3?
For everyday use, niacinamide. Both forms meet your daily vitamin B3 need equally well, but niacinamide does not cause flushing, so it suits daily multivitamins. Niacin (nicotinic acid) can cause a flush, and at very high prescription doses doctors have used it to change cholesterol levels.
| Feature | Niacinamide (nicotinamide) | Niacin (nicotinic acid) |
|---|---|---|
| Becomes NAD in the body | Yes | Yes |
| Meets your daily B3 need | Yes | Yes |
| Causes a flush | No | Yes, at about 30–50 mg or more |
| Where you see it | Most multivitamins and B-complex tablets; skin serums | Some B-complex tablets; high-dose prescription tablets |
| Best for | Comfortable everyday use | Doctor-guided use at high doses |
For everyday nutrition the two forms do the same job. Niacinamide is simply the more comfortable one to take every day.1,2
The niacin flush: what it is and why it happens
Is the niacin flush harmful?
No, it is harmless. The niacin flush is a warm, red, tingly feeling on the face, arms and chest. It starts within about 30 minutes of taking 30 to 50 mg or more of nicotinic acid and fades on its own. It happens because small blood vessels in the skin widen. It is harmless, and it does not show that a supplement is working.
Nicotinic acid makes skin cells release natural signals called prostaglandins. These tell the tiny blood vessels under your skin to widen. More warm blood flows near the surface, so the skin looks red and feels hot or prickly.2
The flush usually starts within 30 minutes and passes by itself.1 It tells you which form of B3 you took, and nothing more. A tablet with niacinamide gives your cells the same vitamin with no flush at all, so “no flush” never means “not working”.
How much vitamin B3 do you need?
How much vitamin B3 do I need each day?
ICMR-NIN sets the daily vitamin B3 target at 18 mg for moderately active adult men and 14 mg for moderately active adult women. The target is counted in “niacin equivalents” because your body also makes B3 from tryptophan, a part of protein: about 60 mg of tryptophan gives 1 mg of B3.
The daily target set by ICMR-NIN is 18 mg for adult men and 14 mg for adult women with moderate activity. Needs rise with activity, because B3 helps burn the extra fuel: about 14 mg (men) and 11 mg (women) if you sit most of the day, and 23 mg and 18 mg for heavy physical work.4
Your body has a clever backup. It can make its own B3 from tryptophan, a building block found in protein foods like dal, milk, paneer, eggs and nuts. About 60 mg of tryptophan makes 1 mg of B3. That is why the target is written as “niacin equivalents” (NE): it counts both the B3 you eat and the B3 you make.1
This backup needs helpers of its own: vitamin B2, vitamin B6 and iron.1,2 It is one more reason B vitamins work best as a team. Our vitamin B2 guide and vitamin B6 guide cover the other two.
Best Indian foods for vitamin B3
What foods are high in vitamin B3?
Peanuts, chicken, fish, brown rice, whole wheat, potatoes and dals are good everyday sources of vitamin B3. Protein foods such as milk, paneer, eggs and dal add more, because the body makes B3 from the tryptophan in them.
| Food | Serving | Vitamin B3 (about) |
|---|---|---|
| Chicken breast | 85 g, cooked | 10.3 mg |
| Salmon and other fish | 85 g, cooked | 8.6 mg |
| Brown rice | 1 cup, cooked | 5.2 mg |
| Peanuts | A small handful (28 g) | 4.2 mg |
| Potato | 1 medium, baked | 2.3 mg |
| Whole wheat bread | 1 slice | 1.4 mg |
| Masoor and other dals | ½ cup, cooked | 1.0 mg, plus tryptophan |
| Milk, curd, paneer, eggs | Daily servings | Mostly as tryptophan the body turns into B3 |
A plate with whole grains, dal, a handful of peanuts and some milk or curd covers most of the day’s vitamin B3 for a vegetarian.1
Signs of vitamin B3 deficiency, and who can run low
What are the signs of vitamin B3 deficiency?
Early signs of low vitamin B3 are tiredness, low mood, headaches and a sore, bright red tongue. Severe deficiency, called pellagra, causes a dark, rough rash on sun-exposed skin, diarrhoea and confusion. It is rare with a mixed diet that has enough protein, and more likely with very limited one-grain diets, heavy alcohol use, gut conditions, low B2, B6 or iron, and the TB medicine isoniazid.
Because the body can make its own B3 from protein, a varied diet usually covers it. The groups below have a higher chance of running low:1,5
- Very limited diets built on one grain. In maize and jowar (sorghum), much of the B3 is locked in a form the body can’t use well. In 1960, Indian scientists recorded B3 deficiency among farm workers near Hyderabad whose diet was mostly jowar.
- Heavy alcohol use, which lowers both intake and absorption.
- Gut conditions that reduce absorption.
- Low vitamin B2, vitamin B6 or iron, which slow the body’s own B3 production.
- Some medicines. The TB medicine isoniazid interferes with the pathway that makes B3 from tryptophan. If you take it, ask your doctor about B vitamins.2
The signs of vitamin B3 deficiency. Early on, low B3 can bring tiredness, low mood, headaches, a poor appetite and a sore, bright red tongue.1 Severe, long-lasting B3 deficiency is called pellagra. Its classic signs are a dark, rough rash on sun-exposed skin, an upset stomach with diarrhoea, and confusion or low mood. Pellagra needs a doctor’s care and responds well to treatment.1,5
Energy is teamwork: B vitamins and magnesium.
Vitamin B3 helps your cells make energy, and magnesium is needed for the same job. Like niacin, magnesium has approved claims for normal energy-yielding metabolism and the reduction of tiredness and fatigue.
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Join the waitlist →Nutrient Gap Finder
Answer a few quick questions about your food, routine and symptoms to see which nutrients you may be running low on, and which tests to ask your doctor about.
Try the Nutrient Gap Finder →How to check vitamin B3 on a supplement label
How do I check vitamin B3 on a supplement label?
On a label, vitamin B3 appears as “niacinamide” or “nicotinamide” (no flush), or as “niacin” or “nicotinic acid” (may flush). Check which form it is, and how many milligrams you get per serving compared with the daily target of 18 mg for men and 14 mg for women.
“Niacinamide” or “nicotinamide”
The no-flush form, comfortable for daily use.
An amount near the daily target
About 14 to 18 mg a day covers an adult’s need.
“Flush means it’s working”
The flush only tells you the form is nicotinic acid.
Very high doses without a doctor
Hundreds of milligrams of niacin is a medical dose, not a daily vitamin.
- The US upper level for B3 from supplements is 35 mg a day for adults. It is set to avoid flushing, and it does not apply to B3 that occurs naturally in food.1
- High-dose nicotinic acid (1,000 to 3,000 mg a day) is a prescription matter. In two large trials, adding it to statin treatment did not lower heart attacks or strokes and caused more side effects.6,7
- A 2024 study linked high blood levels of 4PY, a breakdown product of excess niacin, with a higher risk of heart events. It shows a link, not proof of cause, and concerns excess intake rather than meeting the daily target.8
- In whole grains, some B3 is bound; plant sources can be only about 30% available, which is one reason protein foods matter too.1
- The jowar finding comes from one recorded outbreak among very poor farm workers on a limited diet; jowar eaten as part of a mixed diet is a healthy grain.5,9
- ICMR-NIN’s niacin targets rise with physical activity (sedentary, moderate, heavy); the 18 and 14 mg figures used here are for moderate activity.4 Food values are from US food tables and vary with variety and cooking.1
- For high-dose nicotinic acid, the US fact sheet lists cautions for people with liver disease, stomach ulcers, gout or diabetes; these apply to medical doses, not to the daily target.1
- European approved claims describe what a nutrient does in the body at adequate intakes; they are not claims to treat any illness.3
Vitamin B3, answered plainly.
What is the difference between niacin and niacinamide?
Does the niacin flush mean the supplement is working?
Is the niacin flush harmful?
Why doesn’t niacinamide cause a flush?
What does vitamin B3 do in the body?
How much vitamin B3 do I need each day?
What are niacin equivalents (NE)?
Which Indian foods are rich in vitamin B3?
What is pellagra?
Is niacinamide in a tablet the same as niacinamide in a skin serum?
Do other B vitamins affect vitamin B3?
What is B3 vitamin for?
What are the signs of vitamin B3 deficiency?
What foods are high in vitamin B3?
Which fruits are rich in vitamin B3?
How to cure vitamin B3 deficiency?
Who should avoid vitamin B3?
What is the best form of vitamin B3?
What drink has niacin?
Is vitamin B3 safe to take daily?
Who needs to take vitamin B3?
What organ does niacin affect?
Studies behind this guide
- National Institutes of Health, Office of Dietary Supplements. Niacin: Fact Sheet for Health Professionals. ods.od.nih.gov
- Linus Pauling Institute, Oregon State University. Niacin. Micronutrient Information Center. lpi.oregonstate.edu
- Commission Regulation (EU) No 432/2012: list of permitted health claims made on foods — niacin and magnesium entries.
- ICMR-National Institute of Nutrition. Nutrient Requirements for Indians: Recommended Dietary Allowances and Estimated Average Requirements, 2020. nin.res.in
- World Health Organization. Pellagra and its prevention and control in major emergencies. WHO/NHD/00.10. Geneva: WHO; 2000.
- AIM-HIGH Investigators. Niacin in patients with low HDL cholesterol levels receiving intensive statin therapy. N Engl J Med. 2011;365(24):2255–2267.
- HPS2-THRIVE Collaborative Group. Effects of extended-release niacin with laropiprant in high-risk patients. N Engl J Med. 2014;371(3):203–212.
- Ferrell M, Wang Z, Anderson JT, et al. A terminal metabolite of niacin promotes vascular inflammation and contributes to cardiovascular disease risk. Nat Med. 2024;30(2):424–434. doi:10.1038/s41591-023-02793-8
- Gopalan C, Srikantia SG. Leucine and pellagra. Lancet. 1960;1(7131):954–957.