Niacin
Niacin (Vitamin B3)
An essential B vitamin that supports energy metabolism, cardiovascular health, and NAD+ production for longevity.
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.
Mechanisms of Action
NAD+ Precursor
Converts to NAD+ for cellular energy
Lipid Modification
Dramatically affects cholesterol levels
Prostaglandin Release
Causes vasodilation (the 'niacin flush')
Recommended Dose
500-2000mg daily for lipid effects; 50-500mg for general health
Loading: Start with 100mg and gradually increase over weeks to minimize flush
Optimal Timing
- With food (reduces flush)
- Evening for lipid effects
- Split doses for high amounts
Take with food
Best Form
Immediate-release niacin (nicotinic acid)
Alternatives: Extended-release niacin (less flush but more liver risk), Niacinamide (no flush, no lipid effects), Inositol hexanicotinate ('no-flush' - less effective)
Immediate-release is most effective for lipids. Avoid sustained-release due to liver concerns. Niacinamide doesn't affect cholesterol.
Duration
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.
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Increased HDL
Significant increase in 'good' cholesterol
Lower Triglycerides
Significant reduction in triglycerides
Niacin Flush
Temporary skin flushing, warmth, itching
Monitor blood sugar; may need medication adjustment
Who Should NOT Take This
- Active liver disease
- Active peptic ulcer
- Severe gout
Drug Interactions
Combination may increase myopathy risk
May enhance hypotensive effects
Possible Side Effects
Tip: Start low, take with food, aspirin 30 min before
Tip: Monitor liver enzymes; avoid sustained-release forms
Tip: Monitor glucose if diabetic
Warnings
- Flush is harmless but uncomfortable
- Monitor liver enzymes at high doses
- Can raise blood sugar and uric acid
Top studies from 40+ peer-reviewed papers
Schandelmaier S et al. • The Cochrane database of systematic reviews (2017)
“Moderate- to high-quality evidence suggests that niacin does not reduce mortality, cardiovascular mortality, non-cardiovascular mortality, the number of fatal or non-fatal myocardial infarctions, nor the number of fatal or non-fatal strokes but is associated with side effects.”
Key Findings:
- Participants randomised to niacin were more likely to discontinue treatment due to side effects than participants randomised to control group (RR 2.17, 95% CI 1.70 to 2.77; participants = 33,539; studies = 17; I2 = 77%; moderate-quality evidence).
- Moderate- to high-quality evidence suggests that niacin does not reduce mortality, cardiovascular mortality, non-cardiovascular mortality, the number of fatal or non-fatal myocardial infarctions, nor the number of fatal or non-fatal strokes but is associated with side effects.
- Benefits from niacin therapy in the prevention of cardiovascular disease events are unlikely.
Xie S et al. • Atherosclerosis (2025)
“Among available LLTs, PCSK9mAbs, inclisiran, CETPi, and niacin significantly decreased Lp(a) levels.”
Key Findings:
- Among available LLTs, PCSK9mAbs, inclisiran, CETPi, and niacin significantly decreased Lp(a) levels.
- Further research is necessary to understand whether this effect would translate into a clinically relevant cardiovascular benefit.
- Further research warranted to confirm findings
Ferrell M et al. • Nature medicine (2024)
“The Author(s), under exclusive licence to Springer Nature America, Inc.”
Key Findings:
- Lastly, treatment with physiological levels of 4PY, but not its structural isomer 2PY, induced expression of VCAM-1 and leukocyte adherence to vascular endothelium in mice.
- Collectively, these results indicate that the terminal breakdown products of excess niacin, 2PY and 4PY, are both associated with residual CVD risk.
- They also suggest an inflammation-dependent mechanism underlying the clinical association between 4PY and MACE.© 2024.
- The Author(s), under exclusive licence to Springer Nature America, Inc.
Nicola CA et al. • Nutrients (2024)
“Daily dietary intake of niacin is significantly lower in patients with glaucoma compared to the general population.”
Key Findings:
- Daily dietary intake of niacin is significantly lower in patients with glaucoma compared to the general population.
- Given different average daily intakes of niacin in these populations, different glaucoma definitions and several confounding variables which weaken the associations, large sample, standardised randomised controlled trials are needed to confirm the potential benefits of niacin in glaucoma.
- Further research warranted to confirm findings
Xia J et al. • Pharmacological research (2023)
“All rights reserved.”
Key Findings:
- Low to very low certainty evidence established chromium supplements as the most effective in reducing fasting blood glucose levels and homeostasis model assessment of insulin resistance (SUCRAs: 90.4% and 78.3%, respectively).
- Vitamin K supplements ranked best in reducing glycated hemoglobin A1c and fasting insulin levels (SUCRAs: 97.0% and 82.3%, respectively), with moderate to very low certainty evidence.
- Vanadium supplements ranked best in lowering total cholesterol levels with very low evidence certainty (SUCRAs:100%).
- Niacin supplements ranked best in triglyceride reductions and increasing high-density lipoprotein cholesterol levels with low to very low evidence certainty (SUCRAs:93.7% and 94.6%, respectively).
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.