What is Vitamin B3 (Niacin)?
A water-soluble vitamin with two main forms: niacin and niacinamide.
Niacin (nicotinic acid) and niacinamide (nicotinamide) are forms of vitamin B3. Both support energy metabolism. Niacin at high doses can improve lipid profiles but causes flushing. Niacinamide does not flush or affect lipids but supports NAD+ production.
What the evidence says
The overall evidence grade for Vitamin B3 (Niacin) is A (strong — consistent, high-quality human evidence (systematic reviews, well-powered RCTs)). Essential nutrient. High-dose niacin effects on lipids well-documented.
Specific findings with supporting evidence:
- Essential for NAD+ production. Evidence grade A.
- High-dose niacin improves lipid profile. Evidence grade A.
Best-supported outcomes:
- Energy metabolism.
- Lipid improvement (niacin).
- Skin health (niacinamide topical).
Where marketing outpaces evidence:
- The claim that "Niacinamide causes flushing" is not supported by the evidence (grade A).
- Marketing often overstates: Niacinamide has same lipid effects as niacin.
Dose and timing
The typical effective dose for Vitamin B3 (Niacin) is 14–500 mg. Higher doses for lipids require monitoring.
Take it in the morning and afternoon with food. Food reduces flushing.
Who it's for, and who should skip it
Most relevant for:
- Those with B3 deficiency.
- Lipid management under medical supervision (niacin).
Not appropriate for:
- Those with liver disease.
- People who cannot tolerate flushing.
Safety and cautions
Caution: Niacin flush. High-dose niacin causes temporary flushing, itching, and warmth. Caution: Liver. High-dose niacin can affect liver function; monitoring recommended.
Common mistakes
- Confusing niacin and niacinamide effects.
- Taking high doses without monitoring.
- Stopping due to flush without trying low-dose.
Myths vs reality
A common misconception: Niacin and niacinamide do the same thing. In reality, niacin affects lipids and flushes; niacinamide does neither.
How it interacts with other compounds
- Vitamin B3 (Niacin) works well alongside b complex — part of B vitamin family.
Questions people ask
What causes the niacin flush? Prostaglandin release causes blood vessel dilation, warmth, and redness.
How do I reduce flushing? Take with food, start low, or use extended-release formulations.
Editorial note
This guide summarizes the published evidence on Vitamin B3 (Niacin). It is educational content, not medical advice. Confirm with your clinician if you take prescription medications or manage a chronic condition.