Niacin Supplement Guide
Evidence-based information on Niacin benefits, dosage, safety, and food sources — sourced from NIH, FDA, and PubMed.
Our assessment
The evidence shows that niacin is a well-studied B vitamin with a clear role in lipid modulation, specifically improving LDL profiles NIH ODS ↗. However, you need to be aware of a significant trade-off: the side effects are common and can be intense, especially at higher doses. Our assessment is that while niacin is effective for specific medical uses under a doctor's care, it is not a casual supplement for general wellness due to its predictable flushing reaction and potential for more serious side effects at high doses NIH ODS ↗.
How it works
Think of niacin as a lipid modulator. It works by influencing how your body processes fats, helping to improve your lipid profile by lowering LDL cholesterol NIH ODS ↗. This mechanism is why it has been used for decades in clinical settings. However, this same process is also responsible for the most common side effect: a harmless but uncomfortable flushing sensation caused by the widening of blood vessels in your skin NIH ODS ↗.
Safety profile
The safety profile of niacin is dose-dependent. The niacin naturally found in food is safe, but dietary supplements containing 30 mg or more of nicotinic acid can cause your skin to turn red, burn, tingle, and itch, along with headaches, rashes, and dizziness NIH ODS ↗. At prescription-level doses of 1,000 mg or more per day, more severe side effects can occur NIH ODS ↗. The FDA has received a total of 12,195 adverse event reports for this product FDA FAERS ↗. Niacin can also interact with certain medicines, including tuberculosis drugs NIH ODS ↗.
Our recommendation
Our recommendation is to not take niacin supplements for general health or "cleaning your arteries" without first consulting your doctor. The flushing side effect is very common and can be alarming. If your doctor prescribes niacin for a specific condition like high cholesterol, follow their dosing instructions carefully. For general nutrition, you should get niacin from food sources, which are safe and do not cause flushing NIH ODS ↗.
AI-assisted analysis based on NIH ODS, FDA, and PubMed data. Citations are linked to original sources.
Recommended Dosage
| Life Stage | Recommended Amount |
|---|---|
| Birth to 6 months | 2 mg |
| Infants 7–12 months | 4 mg NE |
| Children 1–3 years | 6 mg NE |
| Children 4–8 years | 8 mg NE |
| Children 9–13 years | 12 mg NE |
| Teen boys 14–18 years | 16 mg NE |
| Teen girls 14–18 years | 14 mg NE |
| Adult men 19+ years | 16 mg NE |
| Adult women 19+ years | 14 mg NE |
| Pregnant teens and women | 18 mg NE |
| Breastfeeding teens and women | 17 mg NE |
Source: National Academies of Sciences, Engineering, and Medicine. Always consult your healthcare provider for personalized dosage recommendations.
Drug Interactions
Niacin dietary supplements can interact or interfere with certain medicines that you take, and some medicines can lower niacin levels in your body. Here are some examples: Tuberculosis drugs (such as isoniazid and pyrazinamide) interfere with the body’s ability to convert tryptophan to niacin. This interference can lower niacin levels in your body. High doses of nicotinic acid (1,500 mg/day or more) can raise blood sugar levels and interfere with the effectiveness of diabetes medications. These doses can even raise blood sugar levels in people who don’t have diabetes. Tell your doctor, pharmacist , and other health care providers about any dietary supplements and prescription or over-the-counter medicines you take. They can tell you if the dietary supplements might interact with your medicines. They can also tell you if the medicines might interfere with how your body absorbs , uses, or breaks down niacin and other nutrients.
Check All InteractionsClinical Evidence
Niacin has been studied in 3+ clinical studies:
Prevalence and Associated Factors of Excessive Dietary Supplement Use Among Japanese Adults: Cross-S...Sugimoto M · 2026
Effects of a Novel Prebiotic and Postbiotic Dietary Supplement on Gut Microbiota, Intestinal Barrier...Yi C · 2026
Prevalence and patterns of dietary supplement use and potential drug interactions among older adults...Khawagi WY · 2025
Health Goals This Supplement Supports
Frequently Asked Questions
How much Niacin should I take daily?
Refer to the Recommended Dosage table above. Individual needs vary by age, gender, and health status. Always follow the dosage on your supplement label and consult your healthcare provider.
What are the side effects of Niacin?
The niacin that food and beverages naturally contain is safe. However, dietary supplements with 30 mg or more of nicotinic acid can make the skin on your face, arms, and chest turn red and burn, tingle, and itch. This can also lead to headaches, rashes, and dizziness. If you take nicotinic acid as a medication in doses of 1,000 or more mg/day, it can cause more severe side effects . These include:
Does Niacin interact with medications?
Niacin dietary supplements can interact or interfere with certain medicines that you take, and some medicines can lower niacin levels in your body. Here are some examples: Tuberculosis drugs (such as isoniazid and pyrazinamide) interfere with the body’s ability to convert tryptophan to niacin. Thi
Medical Disclaimer: The information on this site is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider before starting any supplement regimen.
FDA Disclaimer: * These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.