Question: I suffer from health anxiety and have received reassurance for the particular fear, but then I thought of something related, and the doctor on the other site who reassured me is not online to answer a follow-up question. I worried that I that I took niacin over the upper limit and read in high doses it could cause liver damage. The UL is 35 mg. and for the last few years I took 38.5. I understand this is fine. Then I recalled that many, many years ago I took a separate B complex with the multi-vitamin which also had niacin/niacinamide and that even it the typical dose was 100 mg plus the smaller amount in the multi, this would not be a concern at all today. NOW, I just remembered that in October of 2016, I took for 20 months Niacin (As niacinamide and 8% inositol hexaniacinate (no flush niacin)) 108mg / 540%. I know I should not read so much on the Internet, but I was getting the impression that the No Flush niacin could be even more dangerous for the liver. One expert was explaining that this is only in very high doses like 2 or 3 grams/day. He reassured me that if I had any liver damage I would have known about it. I am fine (except for health anxiety). Can you reassure me that taking this No Flush niacin 108 mg in addition to the multi-vitamin with niacin was still safe and that I do not have to worry about this?

I meant to say I took the 108 mg for 2 months, 60 capsules, one a day, NOT 20 months.

Thank you, Dr. Ditah for answering. So, even with the 108 mg added to the small amount in a multivitamin, taken for 2 months last year, you can say that I would know if there were a problem. It would be evident to me, right?


I think I misunderstood, also, that it is the time release not the no flush that could be more dangerous.

I don't believe I took the slow release niacin, and if I did it was many years ago. Even if I did take this more dangerous form, would I still be in the clear now?

Thank you. Another doctor assured me that "rest assured" it did no harm, and that I would have had by now prominent symptoms so I would have known it. Having health anxiety, his definite answer calmed me down. I hope you agree.

Unlikely still makes me anxious...

Thank you very much.