Vitamin B3 (Niacin)
Also known as Niacin, Nicotinic acid, Niacinamide
Niacin is a precursor to NAD and NADP, coenzymes that fuel cellular energy production, DNA repair, and sirtuin signalling. It has strong evidence for raising HDL and lowering LDL/triglycerides at high pharmacological doses, but flushing and liver concerns limit its use. Niacinamide does not cause flushing but lacks the lipid effects.
Benefits
Improves cholesterol profile
StrongHigh-dose niacin raises HDL and lowers triglycerides; it also lowers LDL modestly.
Supports NAD+ production
StrongNiacin is a direct precursor for NAD+, which declines with age and supports cellular repair.
May benefit skin
ModerateTopical and oral niacinamide is used for acne, barrier function, and pigmentation.
Pros & cons
Pros
- Strong lipid-modifying effects at high doses
- Boosts NAD+ levels
- Niacinamide form is flush-free and gentle on skin
Cons
- Flushing makes immediate-release nicotinic acid hard to tolerate
- High-dose use requires medical supervision and liver monitoring
- Niacinamide does not improve cholesterol
Side effects
Flushing (nicotinic acid)
Immediate-release nicotinic acid causes a harmless but uncomfortable hot flush and itch.
Liver toxicity at high doses
Sustained-release or very high doses can raise liver enzymes; requires monitoring.
Can worsen blood sugar
High-dose niacin may increase fasting glucose in susceptible individuals.
How to take it
Typical dose
14–16 mg RDA; 500–2,000 mg for lipid effects under medical supervision
Timing
With meals; take lipid-lowering doses at night
Tip: Do not self-prescribe high-dose niacin for cholesterol without medical supervision.
Forms: which one to choose
The main forms of Vitamin B3 (Niacin) compared by absorption, tolerability, and best use.
Nicotinic Acid
High absorptionBest for: Lipid management under medical supervision · The only form proven to significantly affect cholesterol
Read about Nicotinic AcidNiacinamide
Most popularHigh absorptionBest for: Skin health, NAD+ support without flushing · Does not improve cholesterol but is the safer general-use form
Read about NiacinamideWhat the research says
Niacin and lipid profile
StrongHigh-dose niacin favourably alters HDL, triglycerides, and LDL in dyslipidaemia.
How it connects
Relationships between Vitamin B3 (Niacin) and other supplements in the matrix.
Magnesium supports many of the same mitochondrial and stress pathways as B3.
Compare the pairingHigh-dose niacin may modestly raise blood sugar; vitamin C does not eliminate this risk, especially in diabetics.
Compare the pairingFrequently asked questions
What is Vitamin B3 (Niacin) used for?
Vitamin B3 (Niacin) is most commonly used for energy, heart health, and skin health. High-dose niacin raises HDL and lowers triglycerides; it also lowers LDL modestly.
How much Vitamin B3 (Niacin) should I take?
A typical dose is 14–16 mg RDA; 500–2,000 mg for lipid effects under medical supervision. Do not self-prescribe high-dose niacin for cholesterol without medical supervision. Start at the lower end and confirm the right dose for you with a healthcare professional.
When is the best time to take Vitamin B3 (Niacin)?
Recommended timing: With meals; take lipid-lowering doses at night.
What are the side effects of Vitamin B3 (Niacin)?
Reported side effects include flushing (nicotinic acid), liver toxicity at high doses, and can worsen blood sugar. Immediate-release nicotinic acid causes a harmless but uncomfortable hot flush and itch.
More Vitamins
Folate (B9)
The active B vitamin behind methylation, mood, and pregnancy health.
Vitamin B1 (Thiamine)
The energy metabolism cofactor that keeps nerves and muscles firing.
Vitamin B12 (Cobalamin)
The methylation and nerve-health vitamin that protects the brain and blood.
Compare Vitamin B3 (Niacin) with
Weighing your options? See how Vitamin B3 (Niacin) stacks up against similar supplements.