Overview
Non-flushing B3 — used for deficiency, skin health, and at high doses in dermatology.
- Whole-food sources (animal products for fat-soluble and B-complex vitamins; produce for water-soluble vitamins)
- Fortified foods (cereals, dairy, plant milks, nutritional yeast)
- Multivitamins or stand-alone supplements in synthetic or food-derived form
- Capsule or softgel
- Sublingual tablet or liquid
- Methylated active form for sensitive individuals
- Multivitamin matrix
Forms & variants of Niacinamide
Different chemical forms of Niacinamide behave differently. Browse each form's mechanism, bioavailability, and best-use context.
NAD+ precursor that bypasses the flush — studied for cellular aging.
Direct NAD+ precursor — popular longevity supplement with growing human data.
Flushing form of B3 — historically used for dyslipidemia at gram doses.
Mechanism of action
Direct NAD+ precursor (does not affect lipids like niacin).
- · Direct NAD+ precursor (does not affect lipids like niacin)
Effects on the body
Organ system effects
Niacinamide supports collagen synthesis, antioxidant defense, or barrier function in skin and integumentary tissues.
Evidence-based benefits
Reduces non-melanoma skin cancer recurrence
Moderate evidenceImproves rosacea/acne
Limited evidencePotential side effects
- · Liver enzyme elevation at >3 g/d
Drug interactions
Supplement interactions
- Collagen peptidesProvides amino acid substrate for connective tissue synthesis.
- Vitamin CRequired cofactor for collagen hydroxylation.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified Niacinamide — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Niacinamide third party tested NSF
CapsulesPre-measured Niacinamide capsules — easiest for travel and consistent daily dosing without scoops or scales.Niacinamide capsules
PowderBulk unflavored Niacinamide powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Niacinamide powder unflavored
Best sellersMost-purchased Niacinamide products on Amazon — a quick way to see what's reviewed widely before you commit.Niacinamide best sellerScientific evidence9Show studiesHide studies
Niacinamide and skin barrier function
Bissett DL, et al.
12-week RCT of topical niacinamide 5%.
Reduced hyperpigmentation, fine lines, and red blotchiness.
PubMed: Niacinamide — Reduces non-melanoma skin cancer recurrence
Live PubMed search
Live results for "Niacinamide Reduces non-melanoma skin cancer recurrence" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "Reduces non-melanoma skin cancer recurrence". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — Improves rosacea/acne
Live PubMed search
Live results for "Niacinamide Improves rosacea/acne" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "Improves rosacea/acne". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — randomized controlled trial
Live PubMed search
Live results for "Niacinamide randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — meta-analysis
Live PubMed search
Live results for "Niacinamide meta-analysis" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — pharmacokinetics
Live PubMed search
Live results for "Niacinamide pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — safety adverse events
Live PubMed search
Live results for "Niacinamide safety adverse events" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.
PubMed: Niacinamide — dose response
Live PubMed search
Live results for "Niacinamide dose response" across the PubMed/MEDLINE peer-reviewed index.
Opens current human and preclinical literature matching Niacinamide and "dose response". Filter by RCT, meta-analysis, or year on the results page.
Google Scholar: Niacinamide — clinical evidence
Live Scholar search
Cross-database citation index for Niacinamide as it relates to "clinical evidence".
Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.