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Niacinamide

What is it?

There are two forms of vitamin B3. One form is niacin, the other is niacinamide. Niacinamide is found in many foods including yeast, meat, fish, milk, eggs, green vegetables, beans, and cereal grains. Niacinamide is also found in many vitamin B complex supplements with other B vitamins. Niacinamide can also be formed in the body from dietary niacin.

Do not confuse niacinamide with niacin, inositol nicotinate (inositol hexaniacinate), or tryptophan. See the separate listings for these topics.

Niacinamide is taken by mouth for preventing vitamin B3 deficiency and related conditions such as pellagra. It is also taken by mouth for schizophrenia, hallucinations due to drugs, Alzheimer's disease and age-related loss of thinking skills, chronic brain syndrome, muscle spasms, depression, motion sickness, alcohol dependence, blood vessel swelling caused by skin lesions, and fluid collection (edema). Niacinamide is also taken by mouth for treating diabetes and two skin conditions called bullous pemphigoid and granuloma annulare.

Some people take niacinamide by mouth for acne, leprosy, attention deficit-hyperactivity disorder (ADHD), memory loss, arthritis, preventing premenstrual headache, improving digestion, protecting against toxins and pollutants, reducing the effects of aging, lowering blood pressure, improving circulation, promoting relaxation, improving orgasm, and preventing cataracts.

Niacinamide is applied to the skin for treating a skin condition called inflammatory acne vulgaris.

How effective is it?

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.

The effectiveness ratings for NIACINAMIDE are as follows:

Likely effective for...

  • Treatment and prevention of niacin deficiency, and certain conditions related to niacin deficiency such as pellagra. . Niacinamide is approved by the U.S. Food and Drug Administration (FDA) for these uses. Niacinamide is sometimes preferred over niacin because it does not cause "flushing," (redness, itching and tingling), a side effect of niacin treatment.

Possibly effective for...

  • Diabetes. Some research suggests that taking niacinamide might help prevent the loss of insulin production in children and adults at risk for type 1 diabetes. It might also prevent the loss of insulin production and reduce the dose of insulin needed by children recently diagnosed with type 1 diabetes. However, niacinamide does not seem to prevent the development of type 1 diabetes in at-risk children. In people with type 2 diabetes, niacinamide seems to help protect insulin production and improve blood sugar control.
  • Osteoarthritis. Taking niacinamide seems to improve joint flexibility and reduce pain and swelling. Some people who take niacinamide might be able to cut down on standard painkilling medications.

Possibly ineffective for...

  • Cancer. Early research suggests that treating people with bladder cancer or surgically removed brain tumors with radiotherapy, carbogen, and niacinamide does not improve survival or tumor control compared to radiotherapy and carbogen alone.

Insufficient evidence to rate effectiveness for...

  • Acne. Early research suggests that taking tablets containing niacinamide, zinc, copper, and folic acid for 8 weeks improves the appearance of skin in people with acne.
  • Age-related vision loss due to retina damage. Early research suggests that taking niacinamide, vitamin E, and lutein for a year improves how well the retina works in people with age-related vision loss due to retina damage.
  • Aging skin. Early research suggests that applying cream containing 5% niacinamide to the face improves blotchiness, wrinkles, elasticity, and redness in women with aging skin due to sun damage.
  • Eczema. Early research suggests that applying cream containing 2% niacinamide decreases water loss and improves hydrate in people with eczema.
  • Attention deficit-hyperactivity disorder (ADHD). There is conflicting evidence regarding the usefulness of niacinamide in combination with other vitamins for the treatment of ADHD.
  • Patches of skin that have darkened. Early research suggests that applying moisturizer containing 5% niacinamide for 4 weeks lightens skin in people with darkened patches of skin. However, it doesn't seem cause additional skin lightening after 8 weeks.
  • Kidney failure. Early research suggests that taking niacinamide for 12 weeks reduces excess blood levels of phosphate and parathyroid hormone in people undergoing dialysis due to kidney failure.
  • Alcohol dependence.
  • Alzheimer's disease and age-related mental decline.
  • Arthritis.
  • Depression.
  • High blood pressure.
  • Motion sickness.
  • Premenstrual headache.
  • Other conditions.
More evidence is needed to rate niacin and niacinamide for these uses.

How does it work?

Niacinamide can be made from niacin in the body. Niacin is converted to niacinamide when it is taken in amounts greater than what is needed by the body. Niacinamide is easily dissolved in water and is well-absorbed when taken by mouth.

Niacinamide is required for the proper function of fats and sugars in the body and to maintain healthy cells.

Unlike niacin, niacinamide has no beneficial effects on fats and should not be used for treating high cholesterol or high fat levels in the blood.

Are there safety concerns?

Niacinamide is LIKELY SAFE for most people when taken by mouth. Unlike niacin, niacinamide does not cause flushing. However, niacinamide might cause minor adverse effects such as stomach upset, intestinal gas, dizziness, rash, itching, and other problems.

When doses of over 3 grams per day of niacinamide are taken, more serious side effects can happen. These include liver problems or high blood sugar.

Niacinamide is POSSIBLY SAFE when taken by mouth and appropriately in children or when applied to the skin of adults.

Special precautions & warnings:

Pregnancy and breast-feeding: Niacinamide is LIKELY SAFE for pregnant and breast-feeding women when taken in the recommended amounts. The recommended amount of niacin for pregnant or breast-feeding women is 30 mg per day for women under 18 years of age, and 35 mg for women over 18.

Allergies: Niacinamide can make allergies more severe because they cause histamine, the chemical responsible for allergic symptoms, to be released.

Diabetes: Niacinamide might increase blood sugar. People with diabetes who take niacinamide should check their blood sugar carefully.

Gallbladder disease: Niacinamide might make gallbladder disease worse.

Gout: Large amounts of niacinamide might bring on gout.

Liver disease: Niacinamide might increase liver damage. Don't use it if you have liver disease.

Stomach or intestinal ulcers: Niacinamide might make ulcers worse. Don't use it if you have ulcers.

Surgery: Niacinamide might interfere with blood sugar control during and after surgery. Stop taking niacinamide at least 2 weeks before a scheduled surgery.

Are there interactions with medications?

Moderate
Be cautious with this combination.
Carbamazepine (Tegretol)
Carbamazepine (Tegretol) is broken down by the body. There is some concern that niacinamide might decrease how fast the body breaks down carbamazepine (Tegretol). But there is not enough information to know if this is important.
Medications that can harm the liver (Hepatotoxic drugs)
Niacinamide might harm the liver, especially when used in high doses. Taking niacinamide along with medication that might also harm the liver can increase the risk of liver damage. Do not take niacinamide if you are taking a medication that can harm the liver.

Some medications that can harm the liver include acetaminophen (Tylenol and others), amiodarone (Cordarone), carbamazepine (Tegretol), isoniazid (INH), methotrexate (Rheumatrex), methyldopa (Aldomet), fluconazole (Diflucan), itraconazole (Sporanox), erythromycin (Erythrocin, Ilosone, others), phenytoin (Dilantin), lovastatin (Mevacor), pravastatin (Pravachol), simvastatin (Zocor), and many others.
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs)
Niacinamide might slow blood clotting. Taking niacinamide along with medications that also slow clotting might increase the chances of bruising and bleeding.

Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, indomethacin (Indocin), ticlopidine (Ticlid), warfarin (Coumadin), and others.
Primidone (Mysoline)
Primidone (Mysoline) is broken down by the body. There is some concern that niacinamide might decrease how fast the body breaks down primidone (Mysoline). But there is not enough information to know if this is important.

Are there interactions with herbs and supplements?

Herbs and supplements that might harm the liver
Niacin, especially in higher doses can cause liver damage. Taking niacin along with other herbs or supplements that might harm the liver could increase this risk. Some of these products include androstenedione, borage leaf, chaparral, comfrey, dehydroepiandrosterone (DHEA), germander, kava, pennyroyal oil, red yeast, and others.
Herbs and supplements that might slow blood clotting
Niacinamide might slow blood clotting. Using niacinamide along with other herbs and supplements that also slow blood clotting might increase the risk of bleeding in some people. Some other herbs of this type include angelica, clove, danshen, garlic, ginger, Panax ginseng, and others.

Are there interactions with foods?

There are no known interactions with foods.

What dose is used?

ADULT

BY MOUTH:
  • For preventing and treating vitamin B3 deficiency and pellagra: For mild vitamin B3 deficiency, 50-100 mg per day of niacinamide is used. For pellagra, 300-500 mg per day of niacinamide is given in divided doses.
  • To slow disease progression of newly diagnosed type 1 diabetes: 25 mg/kg of niacinamide is used daily.
  • For treating type 2 diabetes: 0.5 grams of niacinamide three times daily for 6 months has been used.
  • For treating osteoarthritis: 3 grams of niacinamide per day in divided doses for 12 weeks.
CHILDREN

BY MOUTH:
  • For pellagra: 100-300 mg of niacinamide is given daily in divided doses.
  • To prevent type 1 diabetes in high-risk children: 1.2 grams/m² (body surface area) of sustained-release niacinamide is used daily.
  • To slow disease progression of newly diagnosed type 1 diabetes: Niacinamide 25 mg/kg daily.
The daily recommended dietary allowances (RDAs) of niacin are: Infants 0-6 months, 2 mg; Infants 7-12 months, 4 mg; Children 1-3 years, 6 mg; Children 4-8 years, 8 mg; Children 9-13 years, 12 mg; Men 14 years and older, 16 mg; Women 14 years and older, 14 mg; Pregnant women, 18 mg; and Lactating women, 17 mg. The maximum daily dose of niacin is: Children 1-3 years, 10 mg; Children 4-8 years, 15 mg; Children 9-13 years, 20 mg; Adults, including Pregnant and Lactating women, 14-18 years, 30 mg; and Adults, including pregnant and breast-feeding women, older than 18 years, 35 mg.

Other names

3-Pyridine Carboxamide, Amide de l'Acide Nicotinique, B Complex Vitamin, Complexe de Vitamines B, Niacinamida, Nicamid, Nicosedine, Nicotinamide, Nicotinic Acid Amide, Nicotylamidum, Vitamin B3, Vitamina B3, Vitamine B3.

Methodology

To learn more about how this article was written, please see the Natural Medicines Comprehensive Database methodology.

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Last reviewed - 03/09/2017