Vitamin B3: Benefits, Food Sources and Niacinamide for Skin

CVS brand Vitamin C supplements, sold in the United States. Each tablet contains 500 mg ascorbic acid, 25 mg citrus biof

Vitamin B3 is an essential nutrient your body uses to turn food into energy and repair cells. Most people get enough from meat, fish, peanuts and fortified grains. It comes in two main forms: niacin, used at high doses for cholesterol under medical supervision, and niacinamide, the gentle form used in skincare for oiliness, redness and dark marks.

This guide is for anyone confused by the two names on supplement labels and serum bottles, and wondering whether they need more B3 at all.

Key takeaways

  • Adults need 14 to 16 mg of niacin equivalents a day, an amount most varied diets provide without supplements.
  • Niacin and niacinamide are both vitamin B3, but they act differently. Niacin causes flushing at higher doses; niacinamide doesn't.
  • High-dose niacin can improve cholesterol numbers but didn't reduce heart attacks or strokes in large trials, and it carries real side effects.
  • Topical niacinamide has good evidence for oil control, barrier support and evening out skin tone.
  • Oral nicotinamide reduced new non-melanoma skin cancers in high-risk people in one major trial, but that's a doctor-guided treatment, not a routine supplement.

What is vitamin B3, and why does it have two names?

Vitamin B3 is a water-soluble B vitamin. Your body turns it into two coenzymes, NAD and NADP, which help run energy production, DNA repair and cell signaling. According to the US Office of Dietary Supplements (ODS), more than 400 enzymes need NAD to work, more than for any other vitamin-derived coenzyme.

On labels you'll see two main forms:

Niacin (nicotinic acid)Niacinamide (nicotinamide)
FlushingYes, at roughly 30 to 50 mg or moreNo
Main medical useHigh doses for blood fats, under supervisionSkin cancer prevention in high-risk patients (oral), various skin uses (topical)
Skincare useRareVery common in serums and moisturizers
In foodYesYes

Your body can also make some niacin from tryptophan, an amino acid in protein foods. That's why requirements are given in "niacin equivalents" (NE).

The flush from niacin is redness, warmth, tingling and itching of the skin, mainly the face and chest, caused by blood vessels widening. ODS describes it as unpleasant rather than dangerous, and it's the main reason many people stop taking high-dose niacin.

How much vitamin B3 do you need each day?

GroupRecommended daily amount (mg NE)
Men 19+16
Women 19+14
Pregnancy18
Breastfeeding17

The tolerable upper intake level for adults is 35 mg a day from supplements and fortified foods. That limit is based on flushing and doesn't apply to people taking niacin under medical supervision. It also isn't a target. Many multivitamins already contain around the daily requirement, so stacking a B-complex on top of a multivitamin can push you toward the limit without you realizing.

Very high doses of niacinamide don't cause flushing but aren't risk-free either; stomach upset and, rarely, liver problems have been reported. Large doses of either form belong under a doctor's care.

Which foods are good sources of vitamin B3?

B3 is one of the easier nutrients to get from food. ODS figures for common sources (Daily Value 16 mg):

FoodNiacin% Daily Value
Beef liver, pan-fried, 3 oz14.9 mg93%
Chicken breast, grilled, 3 oz10.3 mg64%
Sockeye salmon, cooked, 3 oz8.6 mg54%
Light tuna, canned in water, 3 oz8.6 mg54%
Peanuts, dry roasted, 1 oz4.2 mg26%

Other useful sources include turkey, pork, brown rice, whole grains, mushrooms, potatoes and fortified breakfast cereals and breads. In many countries, refined flour is enriched with niacin, which is a big reason deficiency became rare.

If you eat little or no meat, a mix of peanuts, legumes, whole grains, mushrooms and fortified foods usually covers your needs. Getting nutrients from whole foods tends to bring other benefits too; our guide on real food vs supplements explains how to strike that balance.

What does vitamin B3 deficiency look like?

Severe deficiency causes pellagra, classically described by the "four Ds": dermatitis, diarrhea, dementia and, if untreated, death. The skin rash typically appears on sun-exposed areas and can look like a bad sunburn that darkens and thickens.

Pellagra was once common where people relied on untreated corn. Corn contains niacin, but in a bound form the body can't easily use. Traditional nixtamalization, soaking corn in an alkaline solution as done for tortillas, releases it. Communities that adopted corn without that step saw epidemics.

Today pellagra is rare in countries with fortified foods, but it still occurs in people at higher risk:

  • People with alcohol use disorder
  • Very restrictive or limited diets
  • Long-term malabsorption, such as from Crohn's disease or untreated celiac disease
  • Hartnup disease, a rare genetic condition affecting tryptophan absorption
  • Some people on certain long-term medicines that interfere with niacin

Milder low intake can cause vaguer problems: tiredness, poor concentration, rough or sensitive skin, digestive upset and low mood. These have many other causes, so don't self-diagnose. If you have cracked mouth corners or skin problems that won't settle, B vitamin status is one of several things worth checking, alongside more common causes like irritation, eczema or infection.

What are the proven health benefits of vitamin B3?

Preventing and treating deficiency

This is the clearest benefit. Adequate B3 keeps the nervous system, skin and digestive tract working, and treating pellagra reverses its symptoms.

Cholesterol: better numbers, but not fewer heart attacks

At pharmacological doses, far above dietary amounts, niacin raises HDL ("good") cholesterol and lowers triglycerides and LDL. That made it a popular heart drug before statins. Two large trials then tested whether adding niacin to statins helped. In AIM-HIGH, extended-release niacin at 1,500 to 2,000 mg a day improved blood fats but didn't reduce cardiovascular events, and the niacin group had more ischemic strokes. In HPS2-THRIVE, with over 25,000 participants, 2 g a day didn't significantly reduce major vascular events and was linked to more diabetes, stomach problems, bleeding and skin reactions.

So high-dose niacin is a prescription decision with clear trade-offs, not a wellness supplement.

Brain and mood

Deficiency causes confusion, anxiety and depression that improve with treatment. Whether extra B3 above normal needs helps memory or mood in healthy people is still being studied, and the evidence isn't strong enough to recommend supplements for that.

What does niacinamide do for your skin?

This is where vitamin B3 gets most attention now, and the evidence is better than for most skincare ingredients.

  • Oil control. In a placebo-controlled study, a 2% niacinamide moisturizer reduced the rate of facial oil production after two to four weeks in Japanese participants and reduced surface oil in a smaller Caucasian group. That's why it's popular for oily skin and visible pores, including the sebaceous filaments covered in our guide to fixing damaged sebaceous filaments.
  • Acne. Niacinamide has anti-inflammatory effects and has performed reasonably against mild inflammatory acne in small trials. It's a useful partner to other acne treatments rather than a replacement for them; see our look at combining niacinamide with other cystic acne treatments.
  • Barrier support. It helps skin make ceramides and other lipids in the outer layer, reducing water loss. That makes it a good fit for dry, sensitive or eczema-prone skin and alongside potentially irritating products like retinoids.
  • Dark marks and uneven tone. Niacinamide reduces the transfer of pigment to surface skin cells, a different route from vitamin C or other brighteners, so it can be combined with them. Improvement usually takes a couple of months.
  • Fine lines. Small trials show modest improvement, smaller than with retinoids. For a reality check on anti-aging claims, see what actually slows skin aging.

Oral nicotinamide and skin cancer

In a phase 3 randomized trial published in the New England Journal of Medicine in 2015, people with a history of several non-melanoma skin cancers who took nicotinamide 500 mg twice daily for 12 months had about 23% fewer new non-melanoma skin cancers than those on placebo. It's a meaningful result for a high-risk group, and dermatologists sometimes recommend it. It isn't a substitute for sunscreen or skin checks, and the benefit was seen while people were taking it.

How do you use niacinamide in a skincare routine?

  1. Pick a moderate strength. Products from about 2% to 5% are effective for most people. Higher strengths are widely sold and usually fine, but some sensitive skin reacts to them.
  2. Apply after cleansing, before heavier creams and sunscreen, once or twice a day.
  3. Combine freely. It works with hyaluronic acid, retinoids, sunscreen and vitamin C. The old worry that niacinamide and vitamin C cancel each other out or cause flushing doesn't hold up under normal skincare conditions.
  4. Patch-test if your skin is reactive: apply to a small area for a few days first.
  5. Give it time. Expect changes in oiliness within about a month and in tone after two to three months.

A common mistake we see is layering three niacinamide products at once, then blaming the ingredient when the skin gets itchy or red. One product is enough.

Does anyone need to pay closer attention to vitamin B3?

Most people don't need to think about B3 at all. A few groups benefit from a quick check of their diet or labels:

  • Pregnant and breastfeeding women. Needs rise slightly, to 18 mg and 17 mg NE a day. A prenatal vitamin plus a normal diet usually covers this. Avoid high-dose B3 supplements unless your doctor recommends them.
  • Older adults with small appetites. When portions shrink, protein foods are often the first to go. Adding an egg, some fish, chicken or a handful of peanuts helps with B3 and protein at the same time.
  • Vegans and vegetarians. Usually fine with a varied diet, but intake can be low if meals lean heavily on refined, unfortified foods. Peanuts, legumes, mushrooms, whole grains and fortified cereals are easy wins.
  • People who drink heavily. Alcohol affects how B vitamins are absorbed and used, and diets are often poor at the same time. This is one of the most common settings for pellagra in wealthier countries.
  • People with gut conditions or after weight loss surgery. Absorption can be reduced. Your care team may check vitamin levels and recommend a specific supplement.

If you fall into one of these groups and have symptoms like a sun-sensitive rash, ongoing diarrhea, confusion or unusual tiredness, raise it with your doctor rather than guessing with supplements. A blood test and a look at your overall diet are more useful than adding another bottle to the cupboard. Timing matters less for B3 than for some nutrients, but if you take several supplements, our guide to timing your daily vitamins can help you keep things simple.

Should you take a vitamin B3 supplement?

For most healthy people eating a varied diet, no. A standard multivitamin covers any small gap. Separate B3 supplements make sense mainly when:

  • A doctor has confirmed deficiency or a high-risk condition.
  • A dermatologist recommends oral nicotinamide because you've had multiple non-melanoma skin cancers.
  • A doctor prescribes niacin for a specific lipid problem and monitors you.

Check with a doctor before high doses if you have liver disease, diabetes, gout, stomach ulcers, or take cholesterol medicines, blood thinners or blood pressure medicines. "No-flush" niacin products sometimes contain forms that don't deliver the same effects as niacin, and sustained-release niacin has been linked to liver problems.

FAQ

What is the difference between niacin and niacinamide?

Both are forms of vitamin B3 and both prevent deficiency. Niacin (nicotinic acid) causes skin flushing at doses above roughly 30 to 50 mg and is used at high doses for blood fats under medical care. Niacinamide (nicotinamide) doesn't cause flushing, is common in multivitamins, and is the form used in skincare and in skin cancer prevention for high-risk patients.

Can I use niacinamide every day?

Yes. Niacinamide is one of the better tolerated skincare ingredients and is usually applied once or twice daily. If your skin gets red, itchy or bumpy, try a lower concentration or use it once a day. It pairs well with moisturizers, sunscreen and retinoids. Stop and see a dermatologist if irritation continues after you reduce how often you use it.

What are the signs of too much niacin?

The most common sign is flushing: warm, red, itchy or tingling skin soon after a dose. Higher, ongoing doses can cause nausea, stomach pain, raised blood sugar and, rarely, liver damage, which may show as tiredness, dark urine or yellowing skin or eyes. Get medical advice promptly if you notice those liver warning signs while taking niacin.

What to do next

  • Check your multivitamin and any B-complex labels so your combined niacin stays within the 35 mg upper limit unless your doctor says otherwise.
  • Include a B3-rich food at most meals, such as poultry, fish, peanuts, whole grains or fortified cereal.
  • If you want niacinamide for your skin, start with one product at a moderate strength and give it two to three months.
  • If you've had several non-melanoma skin cancers, ask your dermatologist whether oral nicotinamide is right for you.

This article is for general information and is not medical advice. Talk to your doctor before taking high-dose niacin or nicotinamide, or if you're pregnant, breastfeeding or take regular medicines. See a doctor if you have ongoing skin rashes, diarrhea, confusion or unexplained fatigue, or signs of liver problems such as yellowing skin or eyes.

Sources

Last reviewed: October 2026.

Comments

Post a Comment

Popular Posts

Muscle Gain Diet: What Actually Works, Kept Simple

Image
To build muscle, most people who lift regularly need about 1.4 to 2.0 grams of protein per kilogram of body weight a day, spread over meals of roughly 20 to 40 grams each, plus enough total food to fuel training. Add consistent strength training and decent sleep, and that covers most of the results. Everything else is fine-tuning. This guide is for anyone who has started lifting and feels buried in conflicting advice about meal timing, shakes and supplement stacks. Here's the short, evidence-based version. Key takeaways The International Society of Sports Nutrition (ISSN) says 1.4 to 2.0 g of protein per kg per day is enough for most exercising people building muscle. Spread protein across the day, about 20 to 40 g per meal, every 3 to 4 hours. Exact timing around your workout matters less than total daily intake. Eating before or after training both work. Creatine monohydrate is the best-supported supplement. Protein powder is a convenience, not a requirement. If you...
Read more

Top 10 Exercises to Help You Sleep Longer and Better

Image
The best exercises for sleep are the ones you'll do most days: brisk walking, yoga, swimming, cycling, strength training and gentle evening stretching all have research linking them to falling asleep faster and sleeping more deeply. Moderate activity can fit almost any time of day. Hard, sweaty workouts are usually best kept away from the last couple of hours before bed. This guide is for you if you lie awake at night, wake up unrefreshed, or want a drug-free way to sleep better, and you'd like to know which kind of movement to try first. Key takeaways Regular activity over weeks matters more than any single workout. Expect gradual change, not an overnight fix. Morning walks outdoors pair movement with daylight, which helps set your body clock. Slow, breath-focused practices such as yoga, tai chi and stretching are the best fit for evenings. Save high-intensity workouts for morning or early afternoon if late sessions keep you up. Exercise helps most sleep problems but...
Read more

Plant-Based Diet for Kidney Disease: Foods, Benefits, Meals

Image
A plant-based diet can suit many people with chronic kidney disease (CKD), and kidney organizations say eating more plants in place of red meat may help slow its progression. The catch is that potassium, phosphorus, protein and sodium still need managing, and your limits depend on your lab results. A renal dietitian should set them. This guide is for people living with CKD, and the family members who cook for them, who want to eat more plants without upsetting their blood work. Key takeaways The National Kidney Foundation says eating more plant-based foods in place of red meat may help prevent and slow the progression of chronic kidney disease. The body absorbs more phosphorus from animal foods than from plant foods, and phosphate additives in processed foods are almost completely absorbed. Foods with 200 mg or more of potassium per serving count as high-potassium, and that includes many fruits, vegetables, beans and nuts. Most adults should keep sodium to no more than 2,300 m...
Read more

Can Pinworms Last for Years? Why Infections Keep Coming Back

Image
No, a single pinworm can't live in your body for years. Adult worms live for only a few weeks. What makes an infection seem to last for months, or even years, is reinfection: eggs get swallowed again and start a new cycle before the old one ends. Break that cycle and the infection clears. This is for parents who've treated a child, seen the itching come back a few weeks later, and started to wonder whether something more serious is going on. Key takeaways Pinworms live for weeks, not years. Long-running "infections" are almost always repeated reinfections. Treatment is two doses of medicine, two weeks apart, because the medicine kills worms but not eggs. Everyone in the household needs treating at the same time, even people with no symptoms. Eggs can survive on bedding, clothes and surfaces for around two to three weeks, so cleaning matters as much as medicine. Pinworm rarely causes serious harm, but see a doctor for babies under 2, during pregnancy, or if t...
Read more

Plant Protein Powder for Acne-Prone Skin: What to Know

Image
If your skin broke out after you started whey protein shakes, switching to a plant-based protein powder is a reasonable experiment. Cow's milk has been linked with acne, and case reports describe acne flares that cleared after whey was stopped. A pea protein powder can support muscle growth, and one trial found results similar to whey. This guide is for people who lift or train and want to keep building muscle without guessing about their skin. It covers what the evidence does and doesn't show, how to choose a powder and how to run a fair test. Key takeaways The milk link is real but not fully explained: the American Academy of Dermatology (AAD) says studies link cow's milk with acne, though the reason isn't clear. Whey evidence is limited: it comes mostly from small case reports and observational studies, not large trials. Pea protein can build muscle: in a 12-week trial, pea and whey produced similar gains in muscle thickness. Sugar matters too: high-gly...
Read more

Soursop Benefits and Risks: Fruit, Leaves and Tea

Image
Soursop fruit is a healthy, fibre-rich tropical fruit that's safe to enjoy in normal amounts. Its leaves and tea have traditional uses with some early lab and animal evidence, but no human trials show soursop treats or cures cancer. High-dose leaf extracts and supplements also raise real concerns about nerve damage, so they deserve caution. This is for anyone who enjoys soursop, has been told to drink the leaf tea for a health problem, or has seen posts claiming it beats chemotherapy and wants a straight answer. Key takeaways The fruit pulp offers fibre, vitamin C and potassium, and fits well in a varied diet. Soursop extracts kill some cancer cells in lab dishes, but that hasn't been shown in people. No reputable cancer organisation supports it as a treatment. Compounds in soursop, especially concentrated in leaves, seeds and bark, can harm nerve cells. Heavy long-term use has been linked to Parkinson-like symptoms. Occasional leaf tea is different from daily concentr...
Read more

Calorie Deficit and Insomnia: Why Dieting Keeps You Awake

Image
Yes, a calorie deficit can cause insomnia. Eating less than you burn lowers overnight blood sugar, raises the hunger hormone ghrelin and nudges cortisol up, and together those signals can wake you at 2 or 3 a.m. The bigger and faster the deficit, the more likely your sleep suffers. This guide is for anyone who started a diet and suddenly sleeps worse. You'll learn how to recognize diet-related sleep trouble, and how to adjust your plan so you keep losing fat without lying awake staring at the ceiling. Key takeaways Diet-related sleep trouble usually looks like waking in the second half of the night, not trouble falling asleep. Large, fast deficits disrupt sleep more than small, steady ones. Keeping protein adequate and saving some carbohydrate for the evening often helps. Poor sleep makes dieting harder: it raises hunger and can shift weight loss away from fat and toward muscle. Loud snoring, gasping, or insomnia that started before the diet needs a medical check, not a ...
Read more

Fruits That Help Reduce Cholesterol and What to Avoid

Image
Avocado, berries, oranges and an apple, fruits that fit a cholesterol-friendly diet Fruits that are rich in soluble fiber, such as apples, pears, oranges, bananas and prunes, can help lower LDL ("bad") cholesterol as part of an overall heart-healthy diet. Avocado can help too when it replaces saturated fat. Fruit alone won't fix high cholesterol, but it's one of the easiest changes to stick with. This guide is for anyone who's just seen a high cholesterol result and wants to know what to put on the plate, and what to watch out for, especially if you take a statin. Key takeaways MedlinePlus lists apples, bananas, oranges, pears and prunes as fruit sources of soluble fiber, which helps lower cholesterol. The suggested target is 10 to 25 grams of soluble fiber a day, from fruit, oats, beans and other foods. In a small controlled study, a moderate-fat diet with one avocado a day lowered LDL more than a similar diet without avocado. Grapefruit, Seville ora...
Read more

No-Sugar Diet: How to Cut Added Sugar Step by Step

Image
A no-sugar diet means cutting added sugars, not the natural sugar in whole fruit, vegetables and plain dairy. You drop soda, sweets and sweetened snacks first, then hunt down hidden sugar in sauces, bread, yogurt and cereal. Most people get through the hardest cravings within one to two weeks. It sounds simple until you start reading labels and find sugar in pasta sauce, salad dressing and "healthy" granola. This guide is for anyone who wants to cut back without a miserable, all-or-nothing approach that collapses by week two. Key takeaways The target is added and free sugars: table sugar, syrups, honey, fruit juice and sweeteners added to processed food. The WHO advises keeping free sugars under 10% of daily calories, with extra benefit below 5%, about 25 grams or 6 teaspoons a day. The CDC reports that US adults average about 17 teaspoons of added sugar a day. Expect cravings, irritability or low energy for the first few days; they usually ease within one to two we...
Read more

Why Am I Losing Muscle Mass? Causes, Signs and Fixes

Image
Most unexplained muscle loss comes from using your muscles less, getting older, or eating too little protein and energy. Less often, it's a sign of nerve damage, a hormone problem or another illness. The good news is that the common causes respond well to regular strength training and enough protein at each meal. Maybe your legs look thinner after a few months at a desk job, or the stairs feel harder than they did last year. This guide is for anyone who has noticed that change and wants to know what's behind it and what to do next. Key takeaways Disuse is the most common cause: muscles shrink when they aren't worked regularly, and this type can often be reversed with exercise and better nutrition. Age plays a part: Cleveland Clinic says age-related muscle loss (sarcopenia) starts in your 30s or 40s and speeds up between ages 65 and 80. Strength training is the main fix: adults should do muscle-strengthening activity on at least 2 days a week, according to the CD...
Read more