B3 Supplement Guide
Evidence-based information on B3 benefits, dosage, safety, and food sources — sourced from NIH, FDA, and PubMed.
Our assessment
The evidence shows that B3 (niacin) is a vital nutrient for energy production, but you need to be very careful with the dosage. While the niacin naturally found in food is safe, taking supplements with 30 mg or more of nicotinic acid can cause a temporary but uncomfortable skin reaction NIH ODS ↗. Our assessment is that this supplement is effective for cellular energy, but the risk of side effects is real and dose-dependent.
How it works
Think of B3 as a cellular power plant worker. It supports your body by enhancing mitochondrial efficiency and biogenesis, which means it helps your cells create more energy. B3 is also crucial for ATP production, the main energy currency of your cells, and it enhances the beta-oxidation of fatty acids for energy. Additionally, it supports Phase I detoxification pathways in your liver, helping your body process toxins NIH ODS ↗.
Safety profile
Data not available on specific FDA adverse event report counts for this product. However, the safety profile is clear: dietary supplements with 30 mg or more of nicotinic acid can cause your skin on your face, arms, and chest to 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 NIH ODS ↗. Niacin supplements can also interact with tuberculosis drugs NIH ODS ↗.
Our recommendation
Start with a low dose, well below 30 mg, to see how your body reacts. If you experience the "niacin flush" (red, tingling skin), it is a common but harmless reaction. Do not take high doses (1,000 mg or more) without medical supervision due to the risk of severe side effects. Always check with your doctor if you are taking any medications, especially for tuberculosis 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 InteractionsFood Sources
Niacin is found naturally in many foods and is added to some foods. You can get recommended amounts of niacin by eating a variety of foods, including the following: Animal foods, such as poultry , beef, pork, and fish Some types of nuts, legumes , and grains Enriched and fortified foods, such as many breads and cereals
Complete food source guideHealth Goals This Supplement Supports
Frequently Asked Questions
How much B3 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 B3?
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:
Can I get enough B3 from food alone?
Niacin is found naturally in many foods and is added to some foods. You can get recommended amounts of niacin by eating a variety of foods, including the following: Animal foods, such as poultry , beef, pork, and fish Some types of nuts, legumes , and grains Enriched and fortified foods, such as man
Does B3 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