Print Friendly, PDF & Email

Disclaimer: This post is currently being reviewed because it does not fit our standards for quality.

Vitamin B3, also known as niacin, is found in most foods. It has many beneficial effects on our health – it lowers cholesterol, protects the brain, helps keep the heart healthy, and improves the skin. Read more below to find out more about this powerful substance.

Introduction to Vitamin B3/Niacin

Vitamin B3 consists of two molecules: nicotinamide and nicotinic acid   – sometimes collectively termed “niacin” (R).

Niacin improves cardiovascular health and reduces cholesterol, improves circulation, and suppresses inflammation. Most people get their recommended daily intake of Vitamin B3 from their diet.

Health Benefits of Niacin

1) Niacin Lowers Cholesterol

Niacin can lower cholesterol in many ways.

First, it decreases LDL-cholesterol (also known as “bad” cholesterol), which can cause blockages in blood vessels (R, R2, R3, R4, R5).

It increases HDL cholesterol (or “good cholesterol”), which can remove other cholesterol from the body (R, R2, R3, R4, R5).

In total, niacin decreases triglyceride levels and overall cholesterol (R, R2, R3).

It also decreases lipoprotein and can reduce lipid accumulation in the liver (RR2, R3, R4).

2) Niacin Improves Heart Health

Taken daily with each meal, niacin prevents coronary heart disease events like non-fatal heart attacks and death (R).

The same study also found that niacin is protective in that niacin may halt or even reverse artery disease progression (R).

One study on humans showed that compared to the placebo group, niacin therapy significantly reduced coronary artery disease and nonfatal heart attacks (R).

3) Niacin Protects the Brain After a Stroke

A study on rats found that niacin is neuroprotective after a stroke (R).

Niacin therapy has also been shown to significantly reduce the chance of a stroke occurring (R).

4) Niacin Has Anti-Inflammatory Properties

It has been found that 1-methylnicotinamide, a metabolite of nicotinamide, possesses significant anti-inflammatory properties. Daily treatment resulted in reduced inflammation symptoms  (R).

5) Niacin Improves Skin

Niacin substantially accelerated healing processes of burned skin (R).

When applied topically to the skin, niacin reduces fine lines and wrinkles, redness, and skin yellowing (R).

Niacin also improves skin elasticity (R).

6) Niacin May Promote Longevity

Niacin increase NAD+ concentrations which could confer pro-longevity effects (R).

Technical Section

  • The level of hs-CRP decreased significantly in patients treated with niacin for 1 month (R).
  • GPR109A,a niacin receptor, seems to mediate anti-lipolytic, anti-inflammatory, and antiatherogenic effects of niacin (R).
  • Niacin binds to adipocyte membrane-bound GPR109A, thereby inhibiting adenylyl cyclase, lowering intracellular cAMP concentrations, and subsequently reducing protein kinase A-mediated activation of hormone-sensitive lipase (HSL) (R).
  • It directly inhibits hepatocyte Acyl-CoA: diacylglycerol acyltransferase 2, a key enzyme catalyzing the terminal step in hepatic triglyceride synthesis (R).
  • Niacin retards apoB-100 production rates, thus limiting LDL production (R).
  • Niacin was recently found to inhibit proprotein convertase subtilisin-like/Kexin-type 9, a protease which accelerates hepatic LDL-receptor degradation and increases LDL-cholesterol  (R).
  • Increases Adiponectin levels (R).
  • Increases Leptin levels (R).
  • Increase in Ketone Bodies (R).
  • Reduces HIF-1a expression (R).
  • The increase of PPARa and PPARy expression in adipocytes (R).

Sources of Vitamin B3/Niacin

You can meet all of your body’s needs for B3 through diet. Niacin is most abundant in meat, eggs, fish, dairy products, certain vegetables, and whole wheat (R).

Vitamin B3 deficiency can cause many problems.

Symptoms of mild Vitamin B3 deficiency include:

  • Indigestion
  • Fatigue
  • Canker sores
  • Vomiting
  • Poor circulation
  • Depression

Severe deficiency can cause a condition known as pellagra, which is characterized by skin problems, diarrhea, and mental problems (R).


The recommended daily allowance of niacin is 16mg daily in adult men and 14mg daily in adult women, which can easily be obtained from a normal diet since vitamin B3 can be found in all animal, plant, and fungal food sources (R).

For supplementation, several studies used 1 Gram, administered three times a day with meals (R).

At high doses, niacin can be toxic. You should not take doses higher than the Recommended Daily Allowance (RDA) except under your doctor’s supervision (R).

Side Effects

Flushing of the face is the most common side effect. Flushing can result cause burning, tingling, itching, and redness of the face, arms, and chest, as well as headaches (R).

An overdose of niacin can cause thrombocytopenia or low blood platelet count. This causes bruising and blood to bleed into tissues (R).

Although there is no evidence that taking large doses of niacin can let you pass drug tests, there have been people who tried doing so.  Niacin toxicity caused organ failures, fever, skin problems, and other disorders (R).

Buy Vitamin B3 (Niacin) Supplement

FDA Compliance

The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition.


1 Star2 Stars3 Stars4 Stars5 Stars (5 votes, average: 4.20 out of 5)

Why did you dislike this article?



  • Linda

    Nicotinamide has been discovered to lower occurrence of Basal Cell Carcinoma and Actinic Keratosis if taken in doses of 500 mg twice a day. The benefit ends when the nicotinamide is discontinued. This has been researched, studied and tested in Australia by Professor Diona Damian and her team at the University of Sydney. Dr Andrew Chen, a final year PhD student who worked with Professor Damian on the trial, won The Rising Star PhD Award in 2016 for Outstanding Cancer Research.

  • carl

    How do I check my niacin level the quickest and cheapest way?

  • Cindi Anderson

    I used to take a lot of niacin because my family has high lp(a) and a lot of heart disease. I didn’t mind the flush, actually came to like it. But then my ears started hurting really badly, and that is harder to deal with. I’m thinking of dropping to a lower dose more often. But do you think niacin works for NAD+ if you don’t flush? I have a theory that the flushing is important for effectiveness.

  • Ash

    Niacin doesn’t appear to be toxic until it’s prolonged and quite a ways over the insanely low RDA.
    I have noticed the best benefits (for sleep, mood) from doses between 300-500mg/day.

    I do agree that very high-dose Niacin CAN be toxic and that taking it over 500mg/daily wouldn’t be a good idea.

    There is a good breakdown here:

    “Hepatotoxicity (liver cell damage), including elevated liver enzymes and jaundice, has been observed at intakes as low as 750 mg of niacin per day for less than three months” (84, 85)

    Also, “Hepatitis has been observed with timed-release niacin at dosages as little as 500 mg/day for two months, although almost all reports of severe hepatitis have been associated with the timed-release form of niacin at doses of 3 to 9 grams per day used to treat high cholesterol for months or years” (25)

    25. Food and Nutrition Board, Institute of Medicine. Niacin. Dietary Reference Intakes: Thiamin, Riboflavin, Niacin, Vitamin B6, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, D.C.: National Academy Press; 1998:123-149. (National Academy Press)

    84. Hendler SS, Rorvik DR, eds. PDR for Nutritional Supplements. Montvale: Medical Economics Company, Inc; 2001.

    85. Vitamins. Drug Facts and Comparisons. St. Louis: Facts and Comparisons; 2000:6-33.

  • Leave a Reply

    Your email address will not be published. Required fields are marked *

    This site uses Akismet to reduce spam. Learn how your comment data is processed.