Ask The Doctor > Questions & Answers > Niacin and liver toxicity

Niacin and liver toxicity

Patient: I’m taking 500mg of Niacin a day, is that safe, like for my liver? would 1000 or 1500mg be safe? 18 female.

 

 

Doctor: The upper intake level for niacin (vitamin B3) is 35mg/day, with the recommended daily intake of 20mg/day. You have not mentioned any past medical history, therefore I presume you are taking this as a supplement. If this is the case, 500mg is excessive, in addition to that in your normal diet. Niacin can be taken in higher doses in certain circumstances for example treatment of high blood lipid levels. Doses > 2.5g per day over time can cause liver damage and glucose intolerance. It is recommended therapy should be discontinued if liver function tests (transaminases AST and ALT) rise >3 times the upper limit of normal. I would recommend discussing the need for continuing therapy with your family doctor.

 


 

 
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Dr. Jimmy Obaji M.D.

Dr. Jimmy Obaji M.D.

Dr. Jimmy Obaji completed his residency in Family Medicine at the University of Manitoba. He currently operates a walk-in-clinic in downtown Toronto.

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