Niacin Side Effects

By | February 10, 2019

If you come into the group of people who take Niacin for any reason, here is some basic info on niacin side effects.

Side effects of Niacin

Niacin is also called vitamin B3 and nicotinic acid. There are certain conditions that require measures like additional niacin intake. However, there can be some side effects. Some of them are considered normal, and if they occur, you do not need to panic:

– Flushing. If one takes a large dose (and that means more than 70 mg), this is what will probably happen. The flushing will last nearly half an hour. Keep in mind that the dose which is enough to cause flushing differs from person to person.


– Rash. Sometimes a rash can go along with flushing.

According to some sources, there are niacin supplements that do not produce flushing effects. Of course, that doesn’t mean that those wouldn’t create some other side effects like:

– Diarrhea

– Vomiting

– Bloating

– Nausea

– sudden blood pressure lowering


There are some niacin side effects that are not common, but we will mention them:

– Skin changes (dryness and pigmentation changes)

– Liver problems

– Light head feeling and/or dizziness

More severe side effects are:

– Mouth swelling

– Face swelling

– Lips or tongue swelling

– Blood in stool

– Black stool

– Dark urine

– Blurred vision

– Sudden heartbeat changes

– Fever

– Excessive sweating

– An appetite loss

– Pain in muscles

– Feet or hands swelling

– Yellow skin

In any of mentioned above keeps repeating and prolongs, do not hesitate to visit your doctor and solve the problem by changing your treatment.

What’s important to know is what happens when a person takes too much Niacin. Overdose is not fatal. Also, it would help if you remembered that you could not overdose with Niacin which came from food. Anyway, if taking Niacin for any reasons, do consult the doctor first.

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