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Niacin Upper Limit: What the 35 mg Cap Means for You

Quick answer

The upper limit for niacin from supplements is 35 mg a day for adults, while the daily need is 16 mg NE for men and 14 mg NE for women. The VapoCept panel lists 7.5 mg NE, 21% of the limit by our arithmetic. Other products add up, so count every source.

Written by the VapoCept label deskUpdated · 4 min read

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A still-life photo from the brand's image set. The brand does not say what it shows, so it is a stand-in, not a capsule ingredient.

The number01

What is the niacin upper limit?

35 mg a day from supplements for adults.

The daily need (RDA) is 16 mg NE for men and 14 mg NE for women (NIH ODS, Niacin (health professional)). The upper limit is the amount above which risk starts to rise, not a target.

Niacin reference amounts
MeasureAdults
Daily need (RDA)16 mg NE men, 14 mg NE women
Upper limit, supplements35 mg
Liver enzyme risesAbove 500 mg a day

Liver safety02

How much niacin is too much for the liver?

Liver harm is a high-dose issue, mostly at hundreds of milligrams a day or more.

LiverTox reports enzyme rises above 500 mg a day, with serious injury linked mainly to sustained-release niacin (LiverTox, Niacin). That is about 67 times the 7.5 mg NE on the panel.

Who should ask03

Who should be careful with niacin supplements?

People with liver, blood sugar or ulcer problems, and anyone stacking several products.

MedlinePlus says too much niacin can cause liver damage, higher blood sugar, peptic ulcers and skin rashes (MedlinePlus, Niacin). Add the niacin in every multivitamin or B complex you take.

Count every source

The limit covers all supplements together, not one bottle.

Label amount vs research amount, log scale

  1. L-Arginine (base)

    5% of the low study amount

    4,000 to 24,000 mg a day in blood pressure trials; 2,000 to 20,000 mg in exercise reviews (Dong 2011, Oral L-arginine and blood pressure meta-analysis)

  2. L-Arginine AKG extract

    5% of the low study amount

    4,000 to 24,000 mg a day, the same arginine range; the AKG share of the 200 mg is not stated (Dong 2011, Oral L-arginine and blood pressure meta-analysis)

  3. L-Citrulline HCl

    1.7% of the low study amount

    6,000 to 8,000 mg a day (blood pressure and exercise studies) (Citrulline, perceived exertion and soreness meta-analysis (2020))

  4. L-Citrulline Malate

    1.7% of the low study amount

    6,000 to 8,000 mg a day; 8,000 mg of citrulline malate is the usual exercise amount (Citrulline, perceived exertion and soreness meta-analysis (2020))

  5. Beta-Alanine

    about 1% of the low study amount

    4,000 to 6,000 mg a day for weeks in exercise studies (NIH ODS, Exercise and athletic performance (health professional))

  6. Niacin

    47% of the adult RDA

    RDA 16 mg NE for men (14 for women); upper limit 35 mg a day from supplements (NIH ODS, Niacin (health professional))

  7. Calcium

    1.8% of the adult RDA

    RDA 1,000 mg a day for adults 19 to 50 (NIH ODS, Calcium (health professional))

Cyan marker: the amount in the brand's panel, as listed. Graphite bar: the range used in research (amber bar for the RDA up to the upper limit). Each step to the right is ten times more. A studied dose says what was tested, not what works for you, and no study tested VapoCept.

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The 7.5 mg line04

Where does VapoCept sit against the limit?

Well below it, at about 21%, if you take nothing else with niacin.

Units differ (NE against mg), so treat that as rough. See the niacin page. If a clinician agrees, the packs follow.

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FAQ05

VapoCept questions people ask

How much niacin is too much in a day?

The upper limit for adults from supplements is 35 mg a day, according to the NIH. It is not a goal. The daily need is 16 mg NE for men and 14 mg NE for women, and the limit applies to all supplement sources added together.

Can you get too much niacin from a multivitamin?

It is possible if several products stack. Add the niacin in each multivitamin, B complex and brain supplement, and compare the total with the 35 mg limit. A pharmacist can check your list. VapoCept's 7.5 mg NE counts toward it.

Does niacin damage the liver?

At high doses, yes. LiverTox reports enzyme rises above 500 mg a day, and serious injury is mostly tied to sustained-release forms. Cleveland Clinic lists right upper belly pain, dark urine and yellow skin as signs to report quickly.

Sources (7)
  1. Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trialsDong JY, et al. American Heart Journal 2011;162(6):959-965 (authors from general knowledge; the fetched page showed only the title, journal and results), 2011
  2. Effect of citrulline on post-exercise rating of perceived exertion, muscle soreness, and blood lactate levels: A systematic review and meta-analysisJournal of Sport and Health Science 2020 (authors not shown on the fetched PubMed page; Rhim HC et al. from general knowledge), 2020
  3. Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
  4. Niacin: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2022
  5. NiacinMedlinePlus (U.S. National Library of Medicine), 2025
  6. LiverTox: NiacinNational Institute of Diabetes and Digestive and Kidney Diseases (NIH), NCBI Bookshelf, 2020
  7. Calcium: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026

Who wrote this06

Written and reviewed by

Written byThe VapoCept label deskVapocepts, U.S. stocking partner for VapoCept

Pages built from the brand information, the brand's images and linked NIH, FDA, FTC and peer-reviewed sources.

Medically reviewed byDr. Akhil Saji, MD, PhysicianRole: Medical reviewerReview date: October 28, 2026

Last updated . Read our editorial standards and how we check reviews. This website is the information site of Vapocepts, the U.S. stocking partner for VapoCept. It is not the manufacturer and it is not the sales page. We earn money when you buy through our order links.

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