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  2. Common side effects of niacin supplements include123:
    • Flushing (sudden warmth, redness, or tingly feeling)
    • Upset stomach
    • Nausea
    • Vomiting
    • Diarrhea
    • Itching
    • Rash
    • Dry skin
    • Cough
    • Skin discoloration
    • Headache
    High doses of niacin available via prescription can cause severe skin flushing combined with dizziness, rapid heartbeat, itching, nausea and vomiting, abdominal pain, and diarrhea4. Niacin can also cause liver problems, stomach ulcers, changes to glucose levels, muscle damage, low blood pressure, heart rhythm changes, and other issues5.
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    Common niacin side effects may include: flushing (sudden warmth, redness, or tingly feeling); upset stomach, nausea, vomiting, diarrhea; abnormal liver function tests; itching, rash, dry skin; cough; skin discoloration; or headache.

    Niacin: Drug Uses, Dosage & Side Effect…

    www.drugs.com/niacin.html

    Some of the more common side effects of niacin can include:

    • reddening and warming of your face (flushing)
    • diarrhea
    • nausea
    • vomiting

    Niacin: Side Effects, Dosage, Uses, and …

    www.healthline.com/health/drugs/niacin-oral-tablet
    Here are the most common side effects of niacin: Flushing (sudden reddening of the face, neck, or upper chest) Itching or dry skin Nausea Vomiting Diarrhea Increased cough

    10 niacin benefits and its side effects - Si…

    www.singlecare.com/blog/niacin-benefits/
    When taken orally in appropriate amounts, niacin appears to be safe. High doses of niacin available via prescription can cause: Severe skin flushing combined with dizziness Rapid heartbeat Itching Nausea and vomiting Abdominal pain Diarrhea

    Niacin - Mayo Clinic

    www.mayoclinic.org/drugs-supplements-niacin/art-…
    Niacin can cause upset stomach and diarrhea. However, all of these side effects tend to fade over time. Risks. Niacin does have risks. It can cause liver problems, stomach ulcers, changes to glucose levels, muscle damage, low blood pressure, heart rhythm changes, and other issues.

    Niacin (Vitamin B3) : Benefits, Dosage, S…

    www.webmd.com/diet/supplement-guide-niacin
     
  3. People also ask
    Are niacin supplements safe?
    The niacin that food and beverages naturally contain is safe. However, dietary supplements with 30 mg or more of nicotinic acid can make the skin on your face, arms, and chest turn red and burn, tingle, and itch. This can also lead to headaches, rashes, and dizziness.

    Niacin - Consumer - Office of Dietary Supplements (ODS)

    ods.od.nih.gov
    What are niacin supplement side effects?
    Your healthcare provider may recommend you take niacin for a health condition or deficiency. However, consuming a supplement like niacin may have potential side effects. These side effects may be common or severe. The most common niacin supplement side effect is skin flushing. Extended-release formulas can help with this symptom.

    Niacin: Uses, Benefits, Side Effects, Dosage, Precautions

    verywellhealth.com
    What happens if you eat niacin too much?
    If niacin is consumed in high doses through supplements, it can lead to toxicity which can potentially cause digestive symptoms like nausea, vomiting, and even liver damage. Niacin, also known as vitamin B3, is made and used by your body to help convert foods that you eat into the energy you need.

    Why You Need to Be Careful with Vitamin B3 Supplements | Verywell H…

    verywellhealth.com
    Can niacin cause stomach problems?
    Niacin can cause upset stomach and diarrhea. However, all of these side effects tend to fade over time. Other health risks. Niacin does have risks. It can cause liver problems, stomach ulcers, changes to glucose levels, muscle damage, low blood pressure, heart rhythm changes, and other issues.

    Niacin (Vitamin B3): Benefits and Side Effects - WebMD

    webmd.com
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  4. WebMD
    https://www.webmd.com/diet/supplement-guide-niacin

    Niacin (Vitamin B3): Benefits and Side Effects - WebMD

     
  5. Mayo Clinic
    https://www.mayoclinic.org/drugs-supplements-niacin/art-20364984

    Niacin - Mayo Clinic

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