Quick summary

Niacinamide, also known as nicotinamide, is a water-soluble form of vitamin B3, one of the B complex vitamins. It acts as an active vitamin form of B3 and is involved in essential cellular processes related to energy metabolism and repair. Niacinamide is distinct from niacin (nicotinic acid) but contributes similarly to vitamin B3’s nutritional roles.

What is it?

Niacinamide (nicotinamide) is a chemical compound that belongs to the vitamin B complex group, specifically as a form of vitamin B3. It is water-soluble, meaning it dissolves in water and excess amounts are typically excreted in urine rather than stored extensively in the body. As a vitamin form, niacinamide is crucial for maintaining normal cellular function and serves as a precursor to coenzymes NAD+ (nicotinamide adenine dinucleotide) and NADP+ (nicotinamide adenine dinucleotide phosphate), which are vital for various metabolic processes.

Main functions in the body

Niacinamide’s primary biological role is related to its involvement in the production of NAD+ and NADP+, coenzymes that support critical redox reactions in cellular metabolism. These cofactors participate in energy production pathways, including glycolysis, the citric acid cycle, and oxidative phosphorylation. Additionally, NAD+ plays an important role in DNA repair, gene expression regulation, and cellular signalling. Although the specific mechanisms linking niacinamide to these processes are complex, the vitamin is essential for maintaining cellular health and energy homeostasis.

Recommended intake and upper limit

Intake recommendations for vitamin B3, which includes niacinamide, vary by age, sex, and life stage, and typically cover niacin expressed in niacin equivalents (NE). Specific Recommended Dietary Allowances (RDA), Adequate Intake (AI), or Tolerable Upper Intake Levels (UL) for niacinamide alone are not provided here. For accurate guidance, reference to authoritative nutritional guidelines such as those from the European Food Safety Authority (EFSA) or national agencies is advised.

Best food sources

Niacinamide itself is usually obtained through dietary niacin, which the body can convert to niacinamide. Rich sources of vitamin B3 include:

  • Meats, especially liver, poultry, and fish
  • Whole grains and enriched grain products
  • Legumes
  • Nuts and seeds
  • Dairy products
  • Some vegetables such as mushrooms and asparagus

Niacinamide is also commonly available in fortified foods and multivitamin preparations.

Deficiency: causes, symptoms and risk groups

Deficiency of vitamin B3 can lead to pellagra, a condition characterized by dermatitis, diarrhea, dementia, and if untreated, can be fatal. Pellagra arises from insufficient dietary niacin or tryptophan (an amino acid precursor to niacin). Risk groups may include individuals with malnutrition, certain malabsorption disorders, chronic alcoholism, or those on diets very low in niacin and tryptophan. Specific symptoms related solely to niacinamide deficiency versus overall niacin deficiency are not well differentiated in the evidence.

Supplement forms

Niacinamide is widely available as a dietary supplement, commonly found as:

  • Pure nicotinamide capsules or tablets
  • Multi-B vitamin complexes
  • Fortified foods and beverages

Unlike niacin (nicotinic acid), niacinamide does not generally cause flushing, a common side effect of niacin supplementation. This difference makes niacinamide a preferred form for some therapeutic or supplementation purposes.

Potential benefits: what does the evidence say?

Research has explored various potential benefits of niacinamide beyond its nutritional role, including:

  • Skin health: Topical and oral niacinamide may support skin barrier function, hydration, and anti-inflammatory effects. It is investigated for conditions like acne, rosacea, and aging skin.
  • Cellular energy and repair: By acting as a NAD+ precursor, niacinamide may influence cellular energy metabolism and DNA repair mechanisms.
  • Neurological function: Some preliminary studies explore neuroprotective roles, but definitive clinical evidence is limited.

However, robust clinical trials demonstrating clear therapeutic benefits of niacinamide supplementation in specific conditions remain limited or inconclusive. There are no European Union authorized health claims specifically for niacinamide as a supplement for disease treatment or prevention described here.

Side effects and toxicity

Niacinamide is generally considered safe at typical dietary intakes and standard supplement doses. It usually does not cause the flushing associated with niacin supplementation. However, very high doses of niacinamide might pose risks, although specific upper intake levels and toxicity data were not provided here. Common side effects and more detailed safety data are lacking in the current evidence set.

Drug and nutrient interactions

No specific drug-nutrient interaction information related to niacinamide has been detailed in the available evidence. It is always advisable for individuals to consult healthcare professionals when taking niacinamide supplements alongside medications, especially for chronic conditions or polypharmacy.

Who should be careful?

Individuals who are pregnant, breastfeeding, have underlying medical conditions, or are taking medications should seek medical advice before starting niacinamide supplementation. Due to incomplete safety data and potential unknown interactions, professional guidance is important.

Frequently asked questions

  • Is niacinamide the same as niacin?
    Niacinamide and niacin (nicotinic acid) are two forms of vitamin B3. While both can fulfill the body’s vitamin B3 requirements, niacinamide does not cause flushing, a common side effect of niacin.
  • Can niacinamide prevent pellagra?
    Yes, by providing an active form of vitamin B3, niacinamide can help prevent pellagra caused by vitamin B3 deficiency.
  • Is niacinamide only available as a supplement?
    No, niacinamide is naturally available through the body’s conversion of dietary niacin and tryptophan and is present in many foods.
  • Can I take high doses of niacinamide safely?
    High-dose supplementation should only be done under medical supervision due to potential risks, and evidence for benefits beyond nutritional needs is limited.

Evidence limitations

The evidence supporting niacinamide’s health roles and supplementation benefits is incomplete in several areas. There is a lack of detailed clinical supplementation studies, comprehensive nutritional intake recommendations specifically for niacinamide, and safety data including upper intake thresholds. Furthermore, no EU-authorized health claims or extensive drug interaction information are available here, highlighting the need for cautious interpretation and consultation with healthcare professionals.

References

Last reviewed

June 2024

Disclaimer: This page provides general information about niacinamide based on currently available scientific evidence. It is not intended to provide medical advice, diagnosis, or treatment. Individual nutritional needs and responses vary. People who are pregnant, breastfeeding, have medical conditions, or take medications should consult a qualified healthcare professional before starting new supplements.