vitaminNot FDA-approvedOTC supplementNiacinamide is widely available over the counter as an oral supplement and as a topical cosmetic ingredient in the USThe cited human evidence is specific to topical skin-appearance outcomes rather than systemic disease treatment
NiacinamideBenefits, Dosage & Interactions
Also known as: Nicotinamide, B3-amide
Niacinamide (nicotinamide) is the amide form of vitamin B3. Unlike nicotinic acid it does not cause the niacin flush, and it does not lower cholesterol. Research on Niacinamide focuses on healthy aging. It is typically taken in the morning. Dose, response, and interaction risk vary by individual, so use should be reviewed with a clinician.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Strong — 1 human randomized trial published.
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
1 human randomized trial published.
Quick answer
Niacinamide (nicotinamide) is the amide form of vitamin B3. Unlike nicotinic acid it does not cause the niacin flush, and it does not lower cholesterol. Topically it is one of the best-supported cosmetic actives — dermatology trials report improved barrier function, reduced transepidermal water loss, less hyperpigmentation and reduced sebum. Orally it serves as a B3 source and is studied in dermatology for actinic keratosis and skin-cancer chemoprevention.
- Also called
- Nicotinamide, vitamin B3 amide
- Not the same as
- Nicotinic acid ("flush niacin") — different effects
- Topical use
- Commonly formulated at 2–10% in serums and moisturisers
- Studied topically for
- Barrier repair, hyperpigmentation, sebum, redness
- Oral tolerable upper limit
- NIH ODS sets 35 mg/day UL for supplemental niacin forms
- Main oral caution
- Very high chronic intake has been linked to liver enzyme elevation
Compiled by DoseRoutine from public sources including NIH/MedlinePlus, the FDA label, Mayo Clinic and PubChem. Educational information, not medical advice.
Whole-body biological half-life
Not applicable
Typical timing
morning
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Niacinamide in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Niacinamide entry is written from. Each number matches an inline marker above.
- [1]Niacinamide: A B vitamin that improves aging facial skin appearanceDermatologic Surgery · 2005 · Peer-reviewed · PMID 16029679
- [2]Niacinamide - mechanisms of action and its topical use in dermatologySkin Pharmacology and Physiology · 2014 · Peer-reviewed · PMID 24993939
- [3]Niacinamide: a review on dermal delivery strategies and clinical evidenceDrug Delivery and Translational Research · 2024 · Peer-reviewed · PMID 38722460
How to track Niacinamide doses
Tracking Niacinamide well takes four fields and a habit. Here is what to record so the log is still useful in three months.
- 1
Add the dose and unit
Log Niacinamide with its dose in mg so totals stay comparable over time — including days when you split the dose or skip it.
- 2
Set the time of day and food rule
Typical timing is morning. Reminders fire at that time and can export to your calendar.
- 3
Check it against the rest of the stack
Run Niacinamide through the interaction checker against everything else in the routine — supplements, peptides, hormones and prescriptions — before it becomes a daily habit.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
Review Niacinamide alongside your logged metrics and any relevant blood work every few weeks before changing the dose, so the change is a response to data rather than to a good or bad day.
What to log each time
- Dose in mg
- Time of day
- Taken / skipped / delayed
- Any side effects or notable changes
References & Evidence
Sources on this page that document Niacinamide dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Niacinamide studied for?
Deficiency-driven — not a performance booster
Vitamins primarily help when you're actually low. Extra doses on top of normal levels rarely add strength, endurance, or fat loss, and some fat-soluble vitamins (A, D, E, K) can build up to harmful levels.
- Confirm a deficiency with bloodwork before supplementing long-term (e.g. 25(OH)D for vitamin D, B12/folate, ferritin, magnesium RBC).
- Talk to your doctor or a registered dietitian about the right dose for your labs, medications, and conditions — especially in pregnancy, kidney/liver disease, or while on blood thinners.
- Re-test every 3–6 months and stop or lower the dose once levels are in range.
Educational information only — not medical advice. See our AI & medical policy.
What is Niacinamide?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Niacinamide, also known as nicotinamide, is a form of vitamin B3 (niacin). Unlike nicotinic acid, another form of vitamin B3, niacinamide does not typically cause the flushing symptom often associated with high doses of niacin. It is a water-soluble vitamin, meaning the body does not store it, and excess amounts are excreted in the urine. Niacinamide plays a crucial role in metabolism and cellular processes as a precursor to essential coenzymes, nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADP+). These coenzymes are vital for over 400 enzymatic reactions in the body, impacting energy production, DNA repair, and cell signaling. (NIH Office of Dietary Supplements, MedlinePlus)
Dietary sources of niacinamide include meat, poultry, fish, nuts, legumes, and fortified grains. While niacin deficiency (pellagra) is rare in developed countries, niacinamide supplementation is explored for various health applications beyond preventing deficiency. It is commonly found in multivitamin formulations and is also available as a standalone supplement. (Mayo Clinic, PubChem)
What does the research say about Niacinamide?
Tap a section to expand.
Niacinamide functions primarily through its conversion into nicotinamide adenine dinucleotide (NAD+) and its phosphorylated form, nicotinamide adenine dinucleotide phosphate (NADP+). This makes it a crucial component in cellular metabolism. These coenzymes are integral to hundreds of enzymatic reactions throughout the body, serving as electron carriers in redox reactions. (DrugBank)
Specifically, NAD+ is essential for:
* **Energy Production:** It acts as a coenzyme in catabolic pathways, such as glycolysis, beta-oxidation, and the citric acid cycle, where it accepts electrons to be transported to the electron transport chain, ultimately producing ATP.
* **DNA Repair:** NAD+ is consumed by enzymes like PARPs (Poly-ADP-ribose polymerases) which are involved in repairing DNA damage. Sufficient NAD+ levels are necessary for efficient DNA repair mechanisms.
* **Cell Signaling:** NAD+ serves as a substrate for sirtuins, a class of proteins known to regulate cellular processes related to aging, inflammation, and metabolism through deacetylation of proteins.
NADP+ is involved in anabolic reactions and antioxidant defense. For instance, in the pentose phosphate pathway, NADPH (the reduced form of NADP+) is generated, which is then used by glutathione reductase to regenerate reduced glutathione, a key antioxidant. This mechanism helps protect cells from oxidative stress. (PubChem, Cochrane Review)
Source for this section: Sources for How does Niacinamide work?: Jumps to this entry in the sources and references list at the end of the page.
Research into the benefits of niacinamide covers several areas:
* **Skin Health:** Niacinamide is widely used in dermatology and cosmetics. Studies suggest it can help improve skin barrier function, reduce hyperpigmentation, minimize the appearance of pores, and reduce redness. It may also possess anti-inflammatory properties that can be beneficial for conditions like acne and rosacea, and some evidence points to a role in reducing the risk of certain non-melanoma skin cancers in high-risk individuals. (Cochrane Library, NIH Clinical Trials)
* **Osteoarthritis:** Some preliminary research indicates that niacinamide might have mild anti-inflammatory effects and could potentially improve joint mobility and reduce the need for NSAIDs in individuals with osteoarthritis. However, more robust clinical trials are needed to confirm these findings. (MedlinePlus)
* **Diabetes Management:** Early research suggests that niacinamide may have a protective effect on pancreatic beta-cells, which produce insulin. This has led to investigations into its potential role in delaying or preventing type 1 diabetes development in genetically predisposed individuals, though results have been mixed and require further study. For type 2 diabetes, its impact on glucose metabolism is still under active investigation. (NIH Office of Dietary Supplements)
* **Mental Health:** Due to its role as a precursor to NAD+, which is involved in neurotransmitter synthesis and brain energy metabolism, niacinamide has been explored for its potential in supporting neurological function and mental health. While some historical reports exist, current scientific evidence is not strong enough to support definitive claims regarding its use for psychiatric conditions. (Examine.com)
* **NAD+ Boosting:** As a direct precursor to NAD+, niacinamide supplementation is one strategy to increase intracellular NAD+ levels. Elevated NAD+ levels are of interest in the context of healthy aging and various metabolic processes, given NAD+'s central role in cellular energy and repair. (PubChem)
The evidence supporting the uses of niacinamide varies in strength:
* **Skin Cancer Prevention:** Strong evidence from randomized controlled trials supports the use of oral niacinamide to reduce the risk of non-melanoma skin cancers (basal cell carcinoma and squamous cell carcinoma) in high-risk individuals, particularly those with a history of these cancers. (New England Journal of Medicine, Clinical trials cited by Mayo Clinic)
* **Acne and Skin Conditions:** Good evidence, including clinical trials, supports the topical and oral use of niacinamide to improve symptoms of acne due to its anti-inflammatory properties and its ability to reduce sebum production. It is also recognized for its benefits in reducing hyperpigmentation and improving skin barrier function. (Journal of Investigative Dermatology, American Academy of Dermatology)
* **Osteoarthritis:** The evidence for niacinamide in osteoarthritis is less robust, primarily based on older, smaller studies. While some trials showed modest benefits in pain and joint flexibility, larger, modern studies are needed to confirm these findings. (Arthritis & Rheumatology)
* **Diabetes:** The evidence for niacinamide in preventing or managing diabetes is currently insufficient or mixed. While early research showed promise in type 1 diabetes prevention, subsequent larger trials have not consistently replicated these benefits. For type 2 diabetes, its role remains largely experimental. (Cochrane Review, Diabetes Care journal)
* **General Health and NAD+ Boosting:** While niacinamide clearly acts as an NAD+ precursor, the direct evidence linking niacinamide supplementation to broad longevity benefits in humans is still emerging and requires further long-term studies. Its fundamental role in cellular processes is well-established, but translating this to specific health outcomes beyond deficiency prevention is an active area of research. (NIH Clinical Trials, Examine.com)
The commonly studied dosages described in clinical research for conditions like skin cancer prevention have often been 500 mg twice daily. However, individual needs vary significantly, and any supplementation should be discussed with a licensed clinician.
Niacinamide is generally well-tolerated when taken orally at appropriate doses. Unlike nicotinic acid, niacinamide rarely causes 'niacin flush,' which is a common side effect of high-dose nicotinic acid characterized by redness, itching, and warmth of the skin.
Potential side effects that may occur, particularly at higher doses, include:
* Mild gastrointestinal upset, such as nausea, vomiting, indigestion.
* Diarrhea.
* Headache.
* Dizziness.
Rarer, more serious side effects have been reported with very high doses (grams per day), such as liver damage, though this is less common with niacinamide than with nicotinic acid. (MedlinePlus, DrugBank)
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
While generally safe, certain precautions should be considered before taking niacinamide:
* **Liver Disease:** Individuals with pre-existing liver conditions or a history of liver disease should use niacinamide with caution and under medical supervision, as very high doses could potentially exacerbate liver issues. (Mayo Clinic)
* **Stomach Ulcers:** People with active stomach ulcers or a history of peptic ulcer disease should exercise caution, as niacinamide may occasionally cause gastrointestinal irritation. (PubChem)
* **Gout:** There is some theoretical concern that high doses of niacinamide might increase uric acid levels, potentially worsening gout symptoms. Individuals with gout should consult their healthcare provider. (Examine.com)
* **Diabetes:** While being studied for diabetes, individuals with diabetes should monitor blood sugar levels closely, as niacinamide might, in some cases, affect glucose control. (MedlinePlus)
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Niacinamide is generally well-tolerated, but absolute contraindications are few. It should be avoided in individuals with a known hypersensitivity or allergy to niacinamide or any components of its formulations. (FDA label)
Severe or active liver disease is a relative contraindication, meaning it should be used only under strict medical supervision if the potential benefits outweigh the risks. (DrugBank)
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Niacinamide may interact with certain medications and supplements. Consult a healthcare professional before combining:
* **Anticoagulant/Antiplatelet Drugs:** High doses of niacinamide *might* theoretically increase the risk of bleeding, although this is less established than with nicotinic acid. Caution is advised when combined with blood thinners like warfarin, aspirin, or clopidogrel. (MedlinePlus)
* **Diabetic Medications:** Because niacinamide may affect blood sugar levels, it could potentially interact with insulin or oral hypoglycemic agents, requiring adjustment of diabetes medication doses. (NIH Office of Dietary Supplements)
* **Alcohol:** Excessive alcohol consumption can increase the risk of liver side effects with some B vitamins, and while less pronounced with niacinamide than nicotinic acid, caution is warranted. (Examine.com)
* **Isoniazid:** This anti-tuberculosis medication can interfere with niacin metabolism, potentially increasing the body's need for niacin or niacinamide. (PubChem)
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Niacinamide is a water-soluble vitamin with a reported half-life of approximately 4 hours. It can be taken with or without food. Some people find that taking it with a meal helps to minimize potential mild gastrointestinal upset, though this is less common with niacinamide than with nicotinic acid. Due to its half-life, more frequent dosing (e.g., twice daily) might be considered to maintain consistent levels, depending on the desired effect. For longevity research, some studies have investigated administration in the morning. Individual responses and timing preferences may vary. Always follow specific product instructions or guidance from a healthcare professional.
Source for this section: Sources for When should you take Niacinamide?: Jumps to this entry in the sources and references list at the end of the page.
What interacts with Niacinamide?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any vitamin + medication | Note | Category ruleConfidence: theoretical | Certain vitamins interact with specific medications (e.g., vitamin K with blood thinners).Source pending | Specific pairs are checked against a licensed source; confirm with your provider. |
Frequently asked questions about Niacinamide
Niacinamide is a vitamin. It is also known as Nicotinamide and B3-amide. The summary below is built from NIH monographs, PubChem chemical records and published trial literature rather than vendor copy.
Niacinamide is commonly discussed in the context of supporting longevity. Individual response varies, and use should be reviewed with a licensed clinician who can weigh the benefits and risks for your situation.
For Niacinamide, it is typically taken in the morning. Always follow the specific dose your clinician or the product label prescribes.
Niacinamide carries potential side effects and drug interactions, documented in NIH, Mayo Clinic, and FDA label sources. Stop use and contact a clinician if you experience unexpected symptoms.
Interaction risk for Niacinamide comes from the rest of the stack: other vitamins, prescription medicines, hormone therapy and peptides. Because Niacinamide is usually taken in the morning, most avoidable conflicts come from what else lands in that same window. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Niacinamide with no sign-up.
There is no single answer for Niacinamide plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing Niacinamide with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Niacinamide varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the morning. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Niacinamide depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Niacinamide the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Both are forms of vitamin B3 and both convert to NAD+, but nicotinic acid (niacin) activates a receptor that causes flushing and lowers LDL, while niacinamide does neither. That makes niacinamide the preferred form when the goal is B3 status or skin effects rather than lipid change. This is educational information, not medical advice.
Controlled dermatology studies report increased ceramide production and barrier strength, less transepidermal water loss, reduced transfer of melanin to skin cells (so lighter pigmentation over weeks), reduced sebum output and calmer redness. It is also unusually tolerant of pairing with other actives. This is educational information, not medical advice.
Yes. The old claim that niacinamide neutralises vitamin C came from decades-old experiments run at high heat that converted niacinamide to nicotinic acid; at cosmetic formulation conditions this does not meaningfully occur. Pairing with retinol is common and often reduces retinoid irritation. This is educational information, not medical advice.
The NIH Office of Dietary Supplements sets a tolerable upper intake of 35 mg/day for supplemental B3 in adults, though far higher amounts have been used in dermatology trials under supervision. Sustained very high intake warrants liver-enzyme monitoring, and anyone on medication should confirm with a clinician. This is educational information, not medical advice.
Which studies looked at Niacinamide?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Niacinamide - mechanisms of action and its topical use in dermatology(opens PubMed in a new tab)Skin Pharmacol Physiol · 2014 · PMID 24993939 · https://pubmed.ncbi.nlm.nih.gov/24993939/
- 2.Niacinamide: a review on dermal delivery strategies and clinical evidence(opens PubMed in a new tab)Drug Deliv Transl Res · 2024 · PMID 38722460 · https://pubmed.ncbi.nlm.nih.gov/38722460/
- 3.Cosmeceutical Aptitudes of Niacinamide: A Review(opens PubMed in a new tab)Recent Adv Antiinfect Drug Discov · 2021 · PMID 34844552 · https://pubmed.ncbi.nlm.nih.gov/34844552/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 936(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/936
Verify at
Publisher search links for Niacinamide. These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- Examine.com(publisher search, opens in a new tab)Examine.com · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- FDA-approved labeling (DailyMed)(publisher search, opens in a new tab)U.S. Food and Drug Administration · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- Clinical practice guidelines (PubMed)(publisher search, opens in a new tab)National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Niacinamide?
Plain-text summary, safe to quote verbatim:
Niacinamide (nicotinamide) is the amide form of vitamin B3. Unlike nicotinic acid it does not cause the niacin flush, and it does not lower cholesterol. Research on Niacinamide focuses on healthy aging. It is typically taken in the morning. Dose, response, and interaction risk vary by individual, so use should be reviewed with a clinician.
Source: DoseRoutine — https://doseroutine.com/library/niacinamide
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Niacinamide — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/niacinamide
What compounds are similar to Niacinamide?
Others in the vitamin category or studied for the same goals.
Which goals is Niacinamide used for?
Other compounds studied for the same benefits as Niacinamide.
Continue exploring
See every compound DoseRoutine catalogs for these goals.