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What Is Niacin?

Niacin, also called vitamin B3, is a water-soluble vitamin involved in energy metabolism and normal cellular function. It is found in foods, dietary supplements, and prescription medications. Dietary niacin helps prevent deficiency conditions such as pellagra, while prescription-strength niacin has been used to manage certain cholesterol disorders. High-dose niacin requires medical supervision because its risks differ substantially from those of normal dietary intake.

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What Is Niacin?

Niacin, also called vitamin B3, is a water-soluble vitamin involved in energy metabolism and normal cellular function. It is found in foods, dietary supplements, and prescription medications. Dietary niacin helps prevent deficiency conditions such as pellagra, while prescription-strength niacin has been used to manage certain cholesterol disorders. High-dose niacin requires medical supervision because its risks differ substantially from those of normal dietary intake.

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How Does Niacin Work?

Niacin is converted into compounds that form part of nicotinamide adenine dinucleotide (NAD) and related coenzymes, which help cells process nutrients and produce energy. At prescription doses, niacin can reduce triglycerides and low-density lipoprotein cholesterol while increasing high-density lipoprotein cholesterol. Its lipid-modifying effects involve several metabolic pathways. However, improvements in cholesterol measurements do not necessarily translate into additional cardiovascular benefits when niacin is added to effective statin treatment.

What Conditions Is Niacin Used to Treat?

Niacin is used nutritionally to prevent or treat vitamin B3 deficiency, including pellagra. Prescription extended-release niacin is approved for certain cholesterol and triglyceride disorders, including selected patients with primary hyperlipidemia or severe hypertriglyceridemia. Its role in cholesterol management is limited by adverse effects and the availability of other effective medications. Niacin should not be used at high doses for cardiovascular prevention without professional guidance.

How Should Niacin Be Taken?

Niacin dosing depends on whether it is taken as a vitamin supplement or prescription lipid-lowering medication. Prescription extended-release niacin is generally started at a low dose and increased gradually. Some products are taken once daily at bedtime with a low-fat snack. Immediate-release and extended-release formulations are not interchangeable at equivalent doses because their toxicity profiles differ. Follow the exact product instructions and avoid high-dose self-treatment.

What Are the Side Effects and Risks of Niacin?

High-dose niacin commonly causes skin flushing, warmth, itching, and gastrointestinal discomfort. Serious risks include liver injury, elevated blood glucose, increased uric acid levels, and gout. Muscle injury can occur, particularly when niacin is combined with certain statins. Rare eye-related reactions, including blurred vision and macular edema, have also been reported. Prescription treatment requires appropriate laboratory monitoring, especially for liver function and glucose control.

Common Questions About Niacin

Is niacin the same as vitamin B3?

Yes. Niacin is a form of vitamin B3. The term is also used for prescription products containing nicotinic acid at much higher doses than typical nutritional supplements.

Does niacin lower cholesterol?

Prescription-strength niacin can lower LDL cholesterol and triglycerides and raise HDL cholesterol. However, it has not consistently shown additional cardiovascular benefits when added to modern statin treatment.

Why does niacin cause flushing?

Niacin can trigger temporary widening of blood vessels near the skin, causing redness, warmth, itching, or tingling. This reaction is especially common with higher doses.

Can too much niacin cause liver damage?

Yes. High-dose niacin can cause serious liver injury, particularly when formulations are changed without medical guidance. Prescription treatment requires monitoring.

References

DailyMed - NIASPAN (niacin) extended-release tablet. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=f9b97613-c62e-40b0-a2aa-a7fde6bd5bc7. Date Accessed October 19, 2026.

Niacin - Health Professional Fact Sheet. National Institutes of Health Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/. Date Accessed October 19, 2026.

Niacin. LiverTox. https://www.ncbi.nlm.nih.gov/books/NBK548176/. Date Accessed October 19, 2026.

Niacin. MedlinePlus. https://medlineplus.gov/druginfo/meds/a682518.html. Date Accessed October 19, 2026.

Nicotinic Acid. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/niacin. Date Accessed October 19, 2026.