Vitamin B3

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Vitamin B3, what it is for, what foods have it, contra indications, reccommended

daily amounts, and the best form to take in a supplement,


Types of Vitamin B3


Niacinamide, niacin, and inositol hexaniacinate.

Required for

Coenzyme or cosubstrate in many biological reduction and oxidation reactions—thus required for energy metabolism  


Found in

yeast, meat, fish, milk, eggs, green vegetables, beans, and cereal grains


Daily Requirement

Men 16mg 

Women 14mg

Pregnancy 18mg


Type Best Absorbed By The Body

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Contra Indications

alcoholism is the main cause of vitamin B3 deficiency.



Adverse effects from niacin containing supplements may include flushing and gastrointestinal distress. The upper intake level for niacin applies to synthetic forms obtained from supplements, fortified foods, or a combination of the two. the timed-release versions are more likely to cause liver damage. Regardless of which form of niacin you're using, doctors recommend periodic liver function tests when using high doses (above 100 mg per day) of niacin.

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Note: does not imply any medical claims from this review. Disclaimer