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Niacin (Vitamin B3)
NAD+ precursor that raises HDL, lowers LDL and triglycerides, and fuels cellular energy metabolism at therapeutic doses.
What the evidence says
Niacin helped in about half (8/15) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 2007–2026 with a typical study size of 3,414 participants.
Based on 45 studies · 22 meta-analyses · 11 RCTs · 625,598 total participants
Confidence
HighWhat the studies found
By outcome
Niacin has an evidence score of 9/10 — very strong evidence based on 45 indexed studies, including 23 meta-analyses. NAD+ precursor that raises HDL, lowers LDL and triglycerides, and fuels cellular energy metabolism at therapeutic doses.
The commonly studied dose of Niacin is 500-2000mg daily for lipid effects; 50-500mg for general health. Research points to an estimated optimal dose around 1500mg, with a minimum effective dose near 500mg. Individual response varies — start low and adjust.
The best time to take Niacin is with meals. Take it with food. Niacin (vitamin B3) in the nicotinic acid form causes prostaglandin-mediated vasodilation (flushing) that is significantly reduced by taking with food.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Niacin (Vitamin B3) is essential for energy metabolism and is a precursor to NAD+, a critical coenzyme for cellular energy and longevity. At higher doses, niacin has well-documented effects on improving cholesterol profiles, raising HDL and lowering LDL and triglycerides. The flush form is most effective for lipids, while niacinamide avoids flushing but doesn't affect cholesterol.
Converts to NAD+ for cellular energy
Dramatically affects cholesterol levels
Causes vasodilation (the 'niacin flush')
How Niacin works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
500-2000mg daily for lipid effects; 50-500mg for general health
Loading: Start with 100mg and gradually increase over weeks to minimize flush
Take with food
| Form | Type |
|---|---|
| 💊Immediate-release niacin (nicotinic acid) | Recommended |
| 💊Extended-release niacin (less flush but more liver risk) | Alternative |
| 💊Niacinamide (no flush, no lipid effects) | Alternative |
| 💊Inositol hexanicotinate ('no-flush' - less effective) | Alternative |
Immediate-release is most effective for lipids. Avoid sustained-release due to liver concerns. Niacinamide doesn't affect cholesterol.
Minimum: 8 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Taking with food and aspirin (30 min before) can reduce flushing. Build up dose slowly over 2-4 weeks.
Based on multiple meta-analyses showing HDL increases. Higher doses increase discontinuation rates due to side effects (RR 2.17). Immediate-release forms have better lipid effects but more flushing.
Significant increase in 'good' cholesterol
Significant reduction in triglycerides
Temporary skin flushing, warmth, itching
Monitor blood sugar; may need medication adjustment
Combination may increase myopathy risk
May enhance hypotensive effects
Tip: Start low, take with food, aspirin 30 min before
Tip: Monitor liver enzymes; avoid sustained-release forms
Tip: Monitor glucose if diabetic
Niacin is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are flushing, liver enzyme elevation, blood sugar elevation. Use caution if any of these apply to you: Active liver disease; Active peptic ulcer; Severe gout.
Berberine
Likely helpsActivates AMPK to regulate blood sugar, improve insulin sensitivity, and support lipid metabolism — comparable to metformin in some trials.
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