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Vitamin

Vitamin B3 (Niacin)

Also known as: Nicotinic acid, Niacinamide, Nicotinamide, B3

A
Evidence

Niacinamide is an essential B vitamin and form of vitamin B3 that supports energy metabolism, DNA repair, and cellular function. It is well-established as an effective supplement for preventing deficiency and has demonstrated benefits for skin health and niacin flush-free supplementation.

Primary uses

  • Energy metabolism support
  • Cardiovascular health
  • DNA repair and cellular function
  • Niacin deficiency prevention
  • Lipid management (at higher doses)
  • NAD+ production
  • Skin health and appearance
  • DNA repair and cellular integrity
  • Cognitive function support
  • Deficiency prevention

How it works

  • Precursor for NAD+ and NADP+ cofactors essential for oxidative metabolism
  • Supports mitochondrial energy production
  • Participates in DNA repair mechanisms
  • Modulates lipid synthesis and cholesterol metabolism at pharmacological doses

Dosage

Typical range
14-16 mg daily (RDA); 500-2000 mg daily for supplementation
Timing
With meals to reduce GI side effects and flushing
With food
Strongly recommended, especially for niacin form, to minimize flushing and nausea
Duration
Safe for long-term daily use at RDA levels; extended use above 35 mg daily requires medical supervision
Special populations
Pregnant/lactating women: 18 mg daily; children: 2-16 mg daily (age-dependent); hepatic impairment: use with caution

Forms

  • Niacin (nicotinic acid)· 70/100
  • Niacinamide (nicotinamide)· 70/100
  • Nicotinamide riboside (NR)· 70/100
  • Nicotinamide mononucleotide (NMN)· 70/100
  • Niacinamide powder· 70/100
  • Niacinamide capsules· 70/100
  • Niacinamide tablets· 70/100
  • Nicotinamide riboside (NR, a precursor form)· 70/100

Safety

Common side effects

  • Niacin flush (flushed skin, tingling, heat sensation) — transient and harmless with niacin but not niacinamide
  • Mild GI upset (nausea, heartburn)
  • Headache

Contraindications

  • Active peptic ulcer disease
  • Severe liver disease
  • Gout or hyperuricemia (niacin can elevate uric acid)
  • Hypersensitivity to niacin or niacinamide

Evidence notes

Vitamin B3 is one of the most well-researched vitamins with extensive RCT evidence for deficiency prevention, energy support, and cardiovascular effects. Strong evidence exists for pharmacological niacin use in lipid management; supplemental doses for general health have robust mechanistic and observational support.

Grade A: Multiple well-designed human trials support the main claims.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.