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Nutrition

Vitamin B3: Benefits, functions & foods

06/08/20215 min read

Vitamin B3, or niacin, is 1 of 8 essential vitamins we need. It’s clever in supplying you with energy and supporting your nervous system, learn more, here.

Summary

1What does niacin do in the body?

Like all the B vitamins, niacin helps to break down fats and protein, converting our food into energy. There are two main forms of niacin...

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2What are the symptoms of a niacin deficiency?

A niacin deficiency is very rare in most Western countries. Symptoms include those related to the skin, nervous system and digestive system...

Jump to details below

3What are the potential benefits of taking a niaci

B vitamins have been shown to help brain function, with niacin in particular warding off cognitive decline and the development of Alzheimer’s...

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What does niacin do in the body?
How much niacin do I need?
Do children need niacin?
Vitamin B3 foods
Which foods are the best sources of niacin?
What are the symptoms of a niacin deficiency?
What happens if I consume too much niacin?
When should I take a niacin supplement?
Should children take a niacin supplement?
Should women take a niacin supplement during pregnancy?
What are the potential benefits of taking a niacin supplement?
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Nutrition

Vitamin B3 – also known as niacin – is one of the eight essential B vitamins.

It helps to release energy from the food we eat, supports normal nervous system function, fights fatigue and also helps to keep your skin healthy.¹

Niacin is water-soluble, so we need to find it in our daily diet. Our bodies do make a small amount of niacin, but we get most of it from our food.²

B3 is found in meat

Such as:^3,4

bruschetta with liver pate on a white ceramic plate , selective focus

Liver
Beef
Chicken
Turkey
Oily fish

Vegetarian sources include:

Eggs
Milk and dairy products
Bread
Fortified breakfast cereals
Broccoli
Asparagus
Peanuts
Mushrooms
Green peas
Sunflower seeds
Avocado

A niacin deficiency is rare in the UK, but a severe lack of vitamin B3 can lead to a condition called pellagra. Symptoms include dry, itchy skin (dermatitis) and diarrhoea.⁵

What does niacin do in the body?

Like all the B vitamins, niacin helps to break down fats and protein, converting our food into energy.

There are two main forms of niacin: nicotinic acid and niacinamide (or nicotinamide).

Nicotinic acid has been shown to help reduce LDL or ‘bad’ cholesterol and increase levels of HDL or ‘good’ cholesterol.⁶

The four main functions of niacin include:^7,8

Promoting skin health
Supporting the nervous system
Helping keep normal, psychological function
Reducing tiredness and fatigue

How much niacin do I need?

How much niacin vitamin B3 you need is dependent on your age and gender.

The reference nutrient intake (RNI) for vitamin B3 is:⁹

2mg a day for women
5mg a day for men

Our body can make small amounts of niacin from the amino acid tryptophan,10 but you still need to get enough from your diet every day.¹⁰

Do children need niacin?

The guidelines for children are as follows:¹¹

Age (years)	Recommended amount of B3 per day
	Boys	Girls
1	5mg	4.7mg
2-3	7.2mg	6.6mg
4-6	9.8mg	9.1mg
7-10	12mg	11.2mg
11-18	16.5mg	13.2mg

Vitamin B3 foods

Wondering how you can make sure you get your daily dose of B3? Read on to find out.

Food high in vitamin B3 on dark background. Healthy diet concept. Top view, flat lay

Which foods are the best sources of niacin?

The richest sources of niacin are animal-based foods, but if you’re vegetarian or vegan, you can find all the vitamin B3 you need in a wide variety of plant foods.

But how much is in each food? The below table should give a clearer picture of how much niacin is in each:^12,13,14

Food	Mg per serving	% RDA
Beef liver, pan fried, 3 oz	14.9	93
Chicken breast, meat only, grilled, 3 oz	10.3	64
Marinara sauce, ready to serve, 1 cup	10.3	64
Turkey breast, meat only, roasted, 3 oz	10	63
Salmon, sockeye, cooked, 3 oz	8.6	54
Tuna, light, canned in water, drained, 3 oz	8.6	54
Pork, tenderloin, roasted, 3 oz	6.3	39
Beef, ground, 90% leam, pan-browned, 3 oz	5.8	36
Rice, brown, cooked, 1 cup	5.2	33
Peanuts, dry roasted, 1 oz	4.2	26
Breakfast cereals fortified with 25% DV niacin	4	25
White rice, enriched, cooked, 1 cup	2.3	14
Potato (russet), baked, 1 medium	2.3	14
Sunflower seeds, dry roasted, 1 oz	2	13
Whole wheat bread, 1 slice	1.4
Pumpkin seeds, dry roasted, 1 oz	1.3	8
Soy milk, unfortified, 1 cup	1.3	8
White bread, enriched, 1 slice	1.3	8
Lentils, boiled and drained, 1/2 cup	1	6
Cooked bulgur, 1 cup	0.9	6
1 medium banana	0.8	5
Frozen edamame, 1/2 cup	0.7	4
Raisins, 1/2 cup	0.6	4
Cherry tomatoes, 1/2 cup	0.5	3
Broccoli, boiled, drained, 1/2 cup	0.4	3
Cry roasted cashews, 1 oz	0.4	3
Plain low fat yoghurt, 1 cup	0.3	2
1 medium apple	0.2	1
Canned chickpeas, drained, 1 cup	0.2	1
Milk, 1% milk fat, 1 cup	0.2	1
Frozen spinach, boiled, 1/2 cup	0.2	1
Raw firm tofu, 1/2 cup	0.2	1
Chopped onions, 1/2 cup	0.1	1
1 large egg	0	0

What are the symptoms of a niacin deficiency?

A niacin deficiency is very rare in most Western countries. Symptoms include those related to the skin, nervous system and digestive system - in severe cases this can include:

Thick, scaly pigmented rash on skin exposed to sunlight
Headache
Memory loss
Dry skin
Nausea / vomiting
Irritability
Disorientation
Fatigue
Feeling lethargic

If left untreated, a niacin deficiency can develop into pellagra that produces sore or ‘raw’ skin, similar to sunburn. It can also lead to dementia and could even be fatal.¹⁵

What happens if I consume too much niacin?

It’s not possible to overdose on niacin through your diet, but you can if you take too many supplements, for example taking a multivitamin and a separate B-complex.

Too much nicotinic acid can cause itching or flushing skin, and, over time, may lead to liver damage.

There’s not enough research to show what happens if you take too much nicotinamide.¹⁶

The NHS says taking less than 17mg of nicotinic acid, or less than 500mg of nicotinamide, a day is not likely to cause any harm.¹⁷

Yellow pills forming shape to B3 alphabet on wood background

When should I take a niacin supplement?

If you eat a balanced diet with a wide range of foods, you should get all the niacin you need.

Niacin is sometimes prescribed by health professionals to help with high cholesterol, but talk to your GP if you’re interested in taking it.¹⁸

Should children take a niacin supplement?

Children should be able to get all the niacin they need from their daily diet.

Should women take a niacin supplement during pregnancy?

If you are deficient in vitamin B3 – ask your doctor for a blood test – a niacin supplement may have the potential to help prevent miscarriage or developmental problems.

But the NHS doesn’t recommend that pregnant women in general take vitamin B3.¹⁹

What are the potential benefits of taking a niacin supplement?

B vitamins have been shown to help brain function, with niacin in particular warding off cognitive decline and the development of Alzheimer’s Disease.^20,21

A number of studies have found that certain B vitamins may benefit people with osteoarthritis.²²

It’s not fully understood how, but niacinamide can improve joint mobility and reduced inflammation in those with OA.²³

Disclaimer

The advice in this article is for information only and should not replace medical care. Please check with your GP or healthcare professional before trying any supplements, treatments or remedies. Food supplements must not be used as a substitute for a varied and balanced diet and a healthy lifestyle.