InfoSynergy
Vitamin B12
B vitamins are often used together to support methylation, red blood cell production, and energy metabolism.
Recommendation: Use balanced doses and avoid masking deficiency symptoms with isolated supplements.
Niacinamide
Vitamin ·Moderate evidence ·Reviewed May 2026
Niacinamide is the amide form of vitamin B3 and a precursor for NAD and NADP coenzymes. Unlike nicotinic acid, it generally does not cause flushing and does not reliably lower lipids. Oral niacinamide is useful for vitamin B3 adequacy and has clinical evidence in selected dermatology contexts, but high doses can still cause adverse effects and should not be treated as risk-free.
What it's good for
What to watch for
- Nausea or stomach upset
- Headache
- Fatigue
- Active liver disease unless clinician-directed
- Use of high-dose B3 products without medical supervision2
The bottom line
Evidence rating moderate. Most-documented uses: supports vitamin b3 status and nad coenzyme pools, does not cause typical niacin flushing, used in dermatology for skin barrier and selected photodamage contexts. 3 sources indexed (2004–2024), with 3 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Niacinamide enters the NAD salvage pathway and supports formation of NAD and NADP, which are required for redox metabolism, DNA repair, and cellular stress responses. It does not activate the nicotinic acid receptor strongly, explaining its lack of flushing and lack of classic niacin lipid effects. At pharmacologic doses it can influence PARP activity, inflammatory signaling, and skin immune responses, but excessive dosing may burden hepatic metabolism.3
Class
Non-flushing vitamin B3 and NAD precursor
Found in food
Poultry, Fish, Meat
Low-status signs
Pellagra with dermatitis, diarrhea, and cognitive changes, Fatigue
Absorption
Water-soluble; take with food
Dosing
Dosing & protocol.
Common range
100-500 mg/day for general supplementation; 500 mg twice daily has been studied for selected skin-cancer prevention contexts under clinician guidance
Recommended form
Plain niacinamide capsule or tablet, not high-dose niacin unless specifically indicated
Water-soluble and well absorbed. Taking with food can reduce nausea; avoid combining multiple high-dose B3 products without checking total intake.2
Forms
Forms & what to buy.
Ranked by evidence and value.
Niacinamide Capsule Recommended
Reliable oral form and usually well tolerated. Take with meals if nausea occurs.
Niacinamide Powder
Allows flexible dosing but increases dosing-error risk. Measure carefully and take with food.
B-Complex with Niacinamide
Combines B vitamins but total B3 dose varies. Take with breakfast or lunch.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Niacinamide capsule.
BudgetBest value
$1 /mo
$0.03 per dose
Mid
$3 /mo
$0.10 per dose
Premium
$8 /mo
$0.25 per dose
Plain niacinamide is inexpensive; branded NAD blends cost more without necessarily adding outcome evidence. Updated 2026-06-04.
Goals
Goal-based dosing.
Vitamin B3 Adequacy
Dose: 16-35 mg niacin equivalents/day from diet and supplements for most adults3
Timing: With meals
Use RDA-level dosing unless a higher clinical goal is present.
NAD Precursor Support
Dose: 100-500 mg/day
Timing: With breakfast or lunch
Functional NAD-related benefits are less established than correction of deficiency.
Clinician-Directed Skin Support
Dose: 500 mg twice daily1
Timing: With meals
Studied in high-risk nonmelanoma skin cancer patients; not a sunscreen substitute.
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Pellagra risk
85% relevance
Corrects niacin deficiency that causes dermatitis and systemic symptoms.3
AppearanceStrong evidenceClinician-directed vitamin B3 repletion
Pellagra requires medical diagnosis and treatment.
Low vitamin B3 intake
72% relevance
Supplies niacin equivalents needed for NAD and NADP coenzymes.3
EnergyStrong evidenceNiacinamide capsule or B-complex
Dietary adequacy should be addressed first.
Photodamage-prone skin
45% relevance
May support DNA repair and skin immune function in high-risk adults.1
AppearanceModerate evidenceNiacinamide tablet
Evidence applies mainly to selected high-risk dermatology patients.
Safety
Full safety detail.
Side effects
- Nausea or stomach upset
- Headache
- Fatigue
- Liver enzyme elevation at high doses
- Possible worsening insulin resistance at pharmacologic doses
Contraindications
- Active liver disease unless clinician-directed
- Use of high-dose B3 products without medical supervision2
- Pregnancy and breastfeeding above prenatal-level intakes unless clinician-directed
- History of severe adverse reaction to niacinamide
Interactions
Interaction records.
InfoSynergy
Methylfolate
Folate status complements B-vitamin metabolism but does not replace niacinamide.
Recommendation: Use together when dietary or lab context supports it.
ModerateCaution
Green Tea Extract
High-dose niacinamide and concentrated green tea extract can both raise liver-safety concerns in susceptible users.
Recommendation: Avoid high-dose stacking in liver disease and stop if jaundice, dark urine, or severe fatigue occurs.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
2- 1A Phase 3 Randomized Trial of Nicotinamide for Skin-Cancer ChemopreventionNeeds sourceNo linkChen AC et al. · New England Journal of Medicine · 2015
Nicotinamide 500 mg twice daily reduced new nonmelanoma skin cancers during treatment in high-risk adults.
- 2Intervention with nicotinamide to prevent type 1 diabetes mellitus: the European Nicotinamide Diabetes Intervention Trial (ENDIT): a randomised controlled trialNeeds sourceNo linkGale EA et al. · Lancet · 2004
High-dose nicotinamide did not reduce type 1 diabetes development in antibody-positive relatives.
Reference material
1- 3Niacin Fact Sheet for Health ProfessionalsNeeds sourceNo linkNational Institutes of Health Office of Dietary Supplements · NIH Office of Dietary Supplements · 2024
NIH summarizes vitamin B3 forms, deficiency, dietary sources, dosing limits, and safety concerns.
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Niacinamide in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.