Niacin RDA Table
| Life stage | RDA (mg NE/day) |
|---|---|
| Infant 0–6 mo | 2 (AI) |
| Infant 7–12 mo | 4 (AI) |
| 1–3 years | 6 |
| 4–8 years | 8 |
| 9–13 years | 12 |
| 14–18 years | 16 (M) / 14 (F) |
| 19+ years | 16 (M) / 14 (F) |
| Pregnancy | 18 |
| Lactation | 17 |
| Upper limit, nicotinic acid | 35 (flush basis) |
| Food | Portion | mg NE | %DV |
|---|---|---|---|
| Chicken breast, grilled | 3 oz | 14.9 | 93% |
| Canned tuna, in water | 3 oz | 11.3 | 71% |
| Salmon, cooked | 3 oz | 8.6 | 54% |
| Beef sirloin steak | 3 oz | 4.9 | 31% |
| Brown rice, cooked | 1 cup | 4.9 | 31% |
| Peanuts, dry-roasted | 1 oz | 4.2 | 26% |
| Mushrooms, portabella | 1/2 cup | 2.5 | 16% |
| Potato, baked | 1 medium | 2.3 | 14% |
| Whole-wheat bread | 1 slice | 1.3 | 8% |
| Coffee, brewed | 1 cup | 0.5 | 3% |
Niacin is the B vitamin with an epidemic in its file: pellagra - the four Ds of dermatitis, diarrhea, dementia and death - swept the American South in the early 1900s on corn-heavy diets, until Joseph Goldberger proved it was a diet deficiency, not infection, by producing it in prison volunteers ('convictND'). The fix came from two directions: niacin fortification, and Latin America's centuries-old nixtamalization - soaking corn in alkaline lime water - which unlocks the bound niacin in corn that plain milling never releases.
The unit carries the chemistry: mg NE (niacin equivalents), because the body converts the amino acid tryptophan into niacin at 60-to-1 - sixty milligrams of tryptophan yield one milligram of niacin. That is why a turkey or chicken dinner counts toward the table even before the vitamin itself: the protein aisle is quietly a niacin aisle, and honest deficiency has been nearly extinct in fortified countries for seventy years.
The modern story is the supplement that outlived its evidence: prescription niacin at 1,000-2,000 mg raised HDL cholesterol and was prescribed for decades, then the AIM-HIGH and HPS2-THRIVE trials found no reduction in heart events - only more side effects, including diabetes onset and liver injury. The 35 mg UL, meanwhile, exists for a symptom rather than an injury: niacin flush, the hot prickly face-and-chest wave that nicotinic acid causes at supplement doses.
How to use
- Find your row: 16 mg NE for men and 14 for women from 19; 16/14 for teens 14-18; 12 at 9-13; 8 at 4-8 and 6 at 1-3; 2-4 mg AI in infancy; pregnancy 18 and breastfeeding 17.
- Cover it from the protein shelf: one 3-ounce grilled chicken breast is 14.9 mg NE (93% DV), turkey, salmon, tuna and beef all deliver 5-11 mg per serving, enriched grains and fortified cereals add 2-5, and peanuts 1 oz chip in 4.2 - any normal protein-containing diet clears 14-16 mg without planning.
- Read the ceiling honestly: 35 mg a day is the UL, set on the flush symptom (skin tingling and warmth) that nicotinic-acid supplements cause - a tolerance to discomfort, not organ damage - but the 1,000-2,000 mg cholesterol doses are a different category entirely, with liver injury and blood-sugar effects that ended their trial career.
Frequently asked questions
How much niacin do I need per day?
The NIH RDA, in mg NE (niacin equivalents): 16 for men and 14 for women from 19; 16/14 for teens 14-18; 12 at 9-13; 8 at 4-8; 6 at 1-3; 2-4 mg AI in infancy. Pregnancy needs 18 and breastfeeding 17. NE counts both preformed niacin and tryptophan converted at 60 mg tryptophan = 1 mg niacin, so protein-rich diets bank niacin through the amino acid route.
What foods are highest in niacin?
Chicken breast leads the common shelf: 14.9 mg NE per 3 ounces grilled (93% DV) - one serving is an adult woman's day. Turkey, salmon, canned tuna and lean beef run 5-11 mg per serving, fortified breakfast cereal up to 20-25 by label, peanuts 4.2 mg per ounce, brown rice 1 cup about 4.9, and potatoes, mushrooms and whole-wheat bread fill the edges. Coffee even contributes a fraction. The pattern: where protein goes, niacin follows - deficiency is now a disease of monoculture diets, not varied kitchens.
What was pellagra - and why does corn get blamed?
Pellagra is severe niacin deficiency: the four Ds - dermatitis (sun-symmetric rash), diarrhea, dementia and death. It ravaged the US South around 1900-1940 on corn-and-molasses diets, until Joseph Goldberger's orphanage and prison experiments proved diet (not germs) caused it. Corn's guilt is conditional: its niacin is chemically bound and biologically unavailable unless the kernel is nixtamalized - soaked in alkaline lime, as Mexican and Central American cooking has done for millennia. Communities that kept the tradition never had the epidemic; industrial milling that skipped it did.
What is niacin flush - and is it dangerous?
Flush is the wave of warmth, redness and prickling across face and chest that nicotinic acid triggers at supplement doses (typically 50 mg up) - capillaries dilating via a prostaglandin pathway, harmless but unpleasant, peaking in minutes and fading inside an hour or two. It is the entire reason the UL is 35 mg a day: a tolerance signal, not an injury threshold. Slow-release and no-flush forms trade the flush for higher liver risk, and time-release preparations have caused serious hepatotoxicity - the flush, ironically, is the safer side effect.
Should I take niacin for cholesterol?
No - the trials retired that use. Niacin at 1,000-2,000 mg daily genuinely raises HDL and lowers LDL and triglycerides, which sustained a fifty-year prescription habit - then AIM-HIGH and HPS2-THRIVE tested adding niacin to statin therapy and found no reduction in cardiovascular events, while adding side effects: flushing, diabetes onset, GI and liver injury, and (in HPS2-THRIVE) infections and bleeding. Statins have the outcome data; niacin has the biomarker. Anyone on a niacin prescription today should be doing it with a specialist, not a supplement label.