Nicotinic Acid – Vitamin B3: Functions, Deficiency & Uses
Nicotinic acid is a form of vitamin B3 and a water-soluble vitamin essential for energy metabolism. It is also used therapeutically to lower elevated blood lipid levels.
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Nicotinic acid is a form of vitamin B3 and a water-soluble vitamin essential for energy metabolism. It is also used therapeutically to lower elevated blood lipid levels.
What is Nicotinic Acid?
Nicotinic acid is a form of vitamin B3 and belongs to the group of water-soluble vitamins. It is an essential nutrient required by the body for numerous metabolic processes. Nicotinic acid occurs naturally in many foods and can also be synthesized in small amounts by the body from the amino acid tryptophan.
Biological Functions
Nicotinic acid plays a central role in cellular energy metabolism. It is a precursor to the coenzymes NAD (nicotinamide adenine dinucleotide) and NADP, which are involved in hundreds of enzymatic reactions in the human body. Key functions include:
- Supporting carbohydrate, fat, and protein metabolism
- Participation in DNA repair and cell division
- Promoting normal function of the nervous system
- Contributing to the maintenance of healthy skin and mucous membranes
- Supporting psychological health and normal cognitive function
Dietary Sources
Nicotinic acid is found in many animal and plant-based foods. Particularly rich sources include:
- Meat (especially poultry, pork, and beef)
- Fish (e.g., tuna, salmon, sardines)
- Liver and organ meats
- Legumes (e.g., peanuts, lentils)
- Whole grain products
- Mushrooms
Recommended Daily Intake
The European Food Safety Authority (EFSA) and the World Health Organization (WHO) recommend the following daily intake levels for niacin (expressed as niacin equivalents):
- Adult men: 16 mg per day
- Adult women: 13 mg per day
- Pregnant women: 15 mg per day
- Breastfeeding women: 17 mg per day
Medical Use
At high, pharmacological doses (far above the dietary requirement), nicotinic acid is used as a medication to treat lipid disorders. It can:
- Lower LDL cholesterol (bad cholesterol) levels
- Raise HDL cholesterol (good cholesterol) levels
- Reduce elevated triglyceride levels in the blood
Due to these effects, nicotinic acid has been used in combination with statins for the prevention of cardiovascular disease. However, more recent clinical trials have shown that the additional benefit in combination with statins is limited, which has led to restrictions on its use in Europe.
Mechanism of Action (Pharmacological)
At pharmacological doses, nicotinic acid inhibits the synthesis of VLDL (very low density lipoprotein) in the liver, leading to reduced production of LDL cholesterol. At the same time, it slows the breakdown of HDL cholesterol. In adipose tissue, it inhibits the release of free fatty acids, which reduces the availability of substrates for triglyceride synthesis in the liver.
Deficiency Symptoms
Severe deficiency of nicotinic acid leads to the disease pellagra, characterized by the classic triad:
- Dermatitis (skin inflammation, especially on sun-exposed areas)
- Diarrhea
- Dementia (mental confusion; together often referred to as the three Ds)
Pellagra occurs mainly in regions where maize is the staple food and a balanced diet is not achievable. Severe niacin deficiency is rare in high-income countries.
Side Effects and Risks at High Doses
Nicotinic acid at high doses can cause side effects. The most common and characteristic is the so-called flush – a sudden sensation of warmth and redness of the skin, particularly on the face and arms. Other possible side effects of high doses include:
- Gastrointestinal complaints (nausea, vomiting)
- Elevated blood sugar levels (particularly relevant for patients with diabetes)
- Elevated uric acid levels (risk of gout)
- Liver damage with very high and prolonged dosing
High doses of nicotinic acid should therefore only be taken under medical supervision.
Interactions
Nicotinic acid can interact with various medications, including:
- Statins: increased risk of muscle damage (myopathy)
- Antidiabetic drugs: nicotinic acid can raise blood sugar and weaken the effect of these medications
- Alcohol: intensifies the flush effect
References
- European Food Safety Authority (EFSA): Dietary Reference Values for niacin. EFSA Journal, 2014.
- World Health Organization (WHO): Vitamin and Mineral Requirements in Human Nutrition, 2nd edition, 2004.
- Kamanna VS, Ganji SH, Kashyap ML: Niacin: an old drug rejuvenated. Current Atherosclerosis Reports, 2009;11(1):45–51.
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