Vitamin B3
Useful mainly for correcting niacin deficiency (pellagra); niacinamide for non-melanoma skin cancer risk reduction.
Quick decision guide
May help most
correcting niacin deficiency (pellagra); niacinamide for non-melanoma skin cancer risk reduction
Common dosing range
14–16 mg NE/day (RDA); higher forms for specific uses under guidance
When to expect effects
Days (deficiency) to months (skin cancer prevention)
Watch out for
high-dose niacin causes flushing and can harm the liver; lipid use lacks outcome benefit
What is it
Vitamin B3 is a water-soluble B-vitamin that exists in several forms: niacin (nicotinic acid), niacinamide (nicotinamide), and nicotinamide riboside. All function as precursors to the coenzymes NAD+ and NADP+, which drive hundreds of redox reactions in cellular metabolism.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
pellagra (niacin deficiency) Strong Evidence | Corrective and often rapid | people with niacin deficiency or pellagra | Days |
non-melanoma skin cancer prevention Good Evidence | ~23% fewer new lesions in high-risk patients | people with a history of multiple basal or squamous cell skin cancers | Months |
dyslipidemia (lipid lowering) Limited Evidence | Meaningful changes in LDL, HDL, triglycerides | people whose clinician targets specific lipid biomarkers | Weeks |
acne (topical niacinamide) Limited Evidence | Modest | people with mild inflammatory acne using topical niacinamide | Weeks |
pellagra (niacin deficiency)
- Effect
- Corrective and often rapid
- Best fit
- people with niacin deficiency or pellagra
- Time
- Days
non-melanoma skin cancer prevention
- Effect
- ~23% fewer new lesions in high-risk patients
- Best fit
- people with a history of multiple basal or squamous cell skin cancers
- Time
- Months
dyslipidemia (lipid lowering)
- Effect
- Meaningful changes in LDL, HDL, triglycerides
- Best fit
- people whose clinician targets specific lipid biomarkers
- Time
- Weeks
acne (topical niacinamide)
- Effect
- Modest
- Best fit
- people with mild inflammatory acne using topical niacinamide
- Time
- Weeks
Evidence for 4 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
pellagra (niacin deficiency)
Corrects deficiencyNiacin reliably reverses pellagra, the disease of niacin deficiency marked by dermatitis, diarrhea, and dementia. This is an established deficiency correction rather than a supplemental benefit. Response to repletion is typically rapid.
Bottom line: Definitive treatment for niacin deficiency and pellagra.
non-melanoma skin cancer prevention
Supplement benefitA randomized controlled trial found oral niacinamide 500 mg twice daily reduced new non-melanoma skin cancers in high-risk patients over 12 months. The effect was modest and did not persist after stopping. Evidence is largely from this population, so generalization to average-risk people is uncertain.
Bottom line: Niacinamide modestly lowers new non-melanoma skin cancers in high-risk patients while taken.
dyslipidemia (lipid lowering)
Biomarker supportPharmacological-dose niacin changes lipid biomarkers, lowering LDL and triglycerides and raising HDL via GPR109A activation. However, large outcome trials adding niacin to statins did not reduce cardiovascular events and showed added harms. This is therefore a biomarker effect, not a demonstrated clinical benefit.
Bottom line: Niacin shifts lipid numbers but has not reduced cardiovascular events in trials, so the benefit is biomarker-level only.
Evidence is mixed
Niacin improves lipid biomarkers, but major RCTs adding it to statins found no cardiovascular-event benefit and increased adverse effects.
acne (topical niacinamide)
Supplement benefitTopical niacinamide has shown modest improvement in inflammatory acne in small studies, likely via anti-inflammatory and sebum-related effects. Evidence is limited and often involves combination formulations. It is a reasonable, low-risk topical option rather than a primary therapy.
Bottom line: Topical niacinamide may modestly help mild acne, but evidence is limited.
How it works
How to take it
What to track
4 commercial forms
Compare the main delivery options and what they’re best suited for.
Niacin (nicotinic acid)
Immediate-release niacin produces the most flushing but has the cleanest safety profile at therapeutic doses. Used for cholesterol modification under medical supervision.
Causes the characteristic flush; the only form with strong lipid effects.
Niacinamide (nicotinamide)
Preferred for general B3 supplementation and indications outside lipids. Does not lower cholesterol but is well-tolerated at higher doses.
No flushing; equivalent NAD+ support.
Inositol hexanicotinate ("no-flush niacin")
Marketed as flush-free niacin, but it appears to release very little active niacin and does not reliably improve lipids.
Slowly hydrolyzes to release free niacin; lipid-lowering evidence is weak.
Sustained/extended-release niacin
Prescription forms (e.g., Niaspan) are designed for cholesterol indications. Over-the-counter sustained-release products carry meaningful liver risk.
Reduced flushing but higher hepatotoxicity risk than immediate-release.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
hepatotoxicity with high-dose or slow-release niacin
elevated uric acid and gout flares
worsened glucose tolerance at high doses
Who should avoid it
- people with liver disease, active peptic ulcer, gout, or uncontrolled diabetes (high-dose niacin)
- people with G6PD deficiency (high-dose niacin)
Pregnancy & breastfeeding
Stay within RDA amounts in pregnancy and lactation unless directed by a clinician.
Interactions
increased risk of myopathy
niacin may potentiate blood-pressure lowering
niacin can raise blood glucose, requiring dose adjustment
amplifies flushing and liver stress
Protocols featuring Vitamin B3
Evidence-backed routines where Vitamin B3 plays a role.
NAD+ & Cellular Energy
longevity
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme essential for mitochondrial energy production, DNA repair (via sirtuins and PARPs), and cellular signaling. NAD+ levels decline measurably with age — roughly 50% by middle age in some tissues. The 2020s have seen explosive interest in NAD+ precursors (NMN, NR) as longevity interventions, popularized by researchers like David Sinclair. The honest framing: NAD+ precursors RELIABLY raise blood NAD+ levels in human trials. What''s less clear is whether this translates to meaningful longevity, cognitive, or healthspan endpoints in humans — most positive evidence is from animal models or small short-duration human trials. This stack is for adults interested in cellular energy support, especially over 40 — with the explicit caveat that this is experimental territory relative to the rest of the library. Foundational Longevity remains the better starting point for general healthspan; this protocol is for adults who want to specifically explore the NAD+ pathway.
Cholesterol Support
cardiovascular
Elevated LDL-C and ApoB are causal drivers of cardiovascular disease — the leading killer of adults. Statins are the gold-standard pharmaceutical intervention with the strongest trial evidence ever assembled in medicine. This stack is NOT a substitute for statin therapy when one is indicated by your cardiovascular risk profile. It IS useful as: a complement to statins for additional LDL reduction, an option for statin-intolerant adults, or a preventive layer for adults with borderline lipids who want to reduce risk before pharmaceutical intervention is warranted. Red yeast rice is essentially low-dose lovastatin (a natural statin compound) and carries similar precautions; bergamot, plant sterols, and niacin each have independent LDL-lowering evidence with different mechanisms. If your LDL-C is over 160 mg/dL, you have a family history of premature cardiovascular disease, or you have other risk factors, please see your doctor. ApoB is a better predictor than LDL-C alone; ask for it.
Rosacea Support
skin conditions
Rosacea is a chronic inflammatory facial dermatosis affecting roughly 5% of adults — disproportionately women aged 30-60 with fair skin (Fitzpatrick I-II), though it occurs across all skin types and is frequently underdiagnosed in darker skin. It presents as four overlapping phenotypes: erythematotelangiectatic (persistent central facial redness with visible vessels), papulopustular (acne-like inflammatory papules and pustules), phymatous (skin thickening and tissue overgrowth, most often on the nose), and ocular (dry, gritty, inflamed eyes — frequently missed because patients see ophthalmology and dermatology separately). The pathology is multifactorial: dysregulated innate immunity via the cathelicidin/LL-37 pathway, mast cell activation, neurovascular hyperresponsiveness, and Demodex folliculorum mite overgrowth all interact. The first-line conventional toolkit — topical metronidazole, ivermectin (Soolantra), azelaic acid, and brimonidine; oral sub-microbial doxycycline; isotretinoin for refractory phymatous disease — is genuinely effective and should not be skipped in favor of supplements. Supplements occupy a narrower supportive role here than in eczema or psoriasis. The trial evidence is thinner, and the most impactful daily actions are trigger identification, photoprotection, and gentle skincare — not a pill regimen. We've included supplements with at least some direct rosacea evidence (oral zinc, niacinamide) plus a few with strong mechanistic rationale (omega-3 for ocular subtype, quercetin for mast cell stabilization). If your rosacea is moderate-to-severe, scarring, or involves the eyes, see a dermatologist (and an ophthalmologist for ocular involvement) — topical ivermectin and oral doxycycline transformed outcomes in the last decade and remain the backbone of treatment.
Food sources
| Food | Amount | %DV |
|---|---|---|
| Chicken breast (3 oz, cooked) | 10.3 mg | — |
| Beef liver (3 oz, cooked) | 14.9 mg | — |
| Tuna (3 oz, cooked) | 8.6 mg | — |
| Turkey (3 oz, cooked) | 10 mg | — |
| Salmon (3 oz, cooked) | 8.6 mg | — |
| Peanuts (1 oz, dry roasted) | 4.2 mg | — |
| Brown rice (1 cup, cooked) | 5.2 mg | — |
| Fortified breakfast cereals | 5-20 mg per serving | — |
Chicken breast (3 oz, cooked)
- Amount
- 10.3 mg
- %DV
- —
Beef liver (3 oz, cooked)
- Amount
- 14.9 mg
- %DV
- —
Tuna (3 oz, cooked)
- Amount
- 8.6 mg
- %DV
- —
Turkey (3 oz, cooked)
- Amount
- 10 mg
- %DV
- —
Salmon (3 oz, cooked)
- Amount
- 8.6 mg
- %DV
- —
Peanuts (1 oz, dry roasted)
- Amount
- 4.2 mg
- %DV
- —
Brown rice (1 cup, cooked)
- Amount
- 5.2 mg
- %DV
- —
Fortified breakfast cereals
- Amount
- 5-20 mg per serving
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Why does niacin make me flush?⌄
Niacin (nicotinic acid) activates a receptor in the skin that triggers prostaglandin release, dilating blood vessels and causing warmth, redness, and tingling. The flush typically peaks in 15-30 minutes and fades within an hour.
What's the difference between niacin and niacinamide?⌄
Both raise NAD+ and prevent deficiency. Only niacin (nicotinic acid) causes flushing and lowers cholesterol. Niacinamide is flush-free but does not affect lipids.
Is no-flush niacin effective for cholesterol?⌄
Inositol hexanicotinate, sold as no-flush niacin, releases very little active niacin and does not reliably lower cholesterol. For lipid effects, immediate-release niacin or a prescription form is needed.
Can I take high-dose niacin without my doctor knowing?⌄
Not recommended. Doses above 500 mg can cause liver issues, raise blood sugar, and interact with statins. Have liver enzymes and glucose monitored if using high doses.
Does niacinamide help with skin?⌄
Topical niacinamide is well-studied for acne, redness, and skin barrier function. Oral nicotinamide has evidence for reducing recurrence of non-melanoma skin cancers in high-risk patients.
References by claim
pellagra (niacin deficiency)
non-melanoma skin cancer prevention
dyslipidemia (lipid lowering)
Track Vitamin B3 with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.