Ingredient · Updated 2026-08-17
Niacin
vitamin B3 · nicotinic acid · niacinamide · nicotinamide
Niacinamide at 250 mg is a genuine, disclosed NAD-related dose — and a much larger one than the fairy-dust milligrams of resveratrol or trigonelline sitting next to it. It is Grade A for treating deficiency and raising NAD-related metabolites. It is Grade D for ‘anti-ageing energy’ as advertised on longevity bottles. Flushing is mainly a nicotinic-acid problem; niacinamide is kinder to the skin and still not a youth serum.
- Study-dose band
- Deficiency: tens of mg. Pharmacologic niacin: 500–2,000 mg nicotinic acid. NAD-booster trials more often use 300–1,000 mg NR.
- Typical bottle
- 16 mg NRV up to 250–500 mg in ‘NAD’ blends
Evidence by outcome
| Outcome | Grade | Note |
|---|---|---|
| Correcting niacin deficiency / NAD precursor status | A | Textbook nutrition. Niacinamide is a direct precursor in the salvage pathway. |
| Lipid-lowering (nicotinic acid) | B | High-dose nicotinic acid changes lipids; it also flushes and is a drug-like intervention. Not what most NAD gummies contain. |
| Longevity / ‘cellular youth’ | D | Human outcome data for nicotinamide as an ageing therapeutic is not in the same league as the marketing. |
Safety
- Niacinamide 250 mg can still sit heavy; take with food as labels usually say.
- High-dose nicotinic acid: flushing, liver monitoring, glucose — not a casual stack.
Unknowns
- Whether 250 mg niacinamide produces the same tissue NAD rise people expect from 300–1,000 mg NR is not settled in head-to-head consumer trials.
Questions
If a NAD bottle has no NR or NMN, is it fake?
Not fake — niacin is a legitimate precursor. It is a different, cheaper molecule than the ones in the headlines. Read the INCI, not the category name.
Sources
Formulas on this desk
- EnduNAD — A NAD bottle without NR or NMN. The workhorse is 250 mg niacinamide. Several headline botanicals are milligram theatre.