How much zinc is too much/how much zinc has adverse effects?

[Tess1129]

Hello,

I've recently been taking zinc supplements to ward off cold and sore throat symptoms. (Someone told me that it can boost my immune system). I have been taking 100mg of zinc for periods of about 5 days until I feel better, and about 50mg the other days when I'd remember to take vitamins. Lately, though, I've been getting dizzy spells about twice a month for short periods of time. I also feel a general tiredness and malaise. After doing a little research, I've realized that I've probably been taking too much, as most people recommend to take no more than 45mg of zinc a day. I have two questions:

How long will it take for what I think are zinc side effects to go away?
Have I done any longterm damage in taking too much zinc?

Thanks so much.

[Debbie Miller, RN]

Hello,
I would not expect any real problem unless you were exceeding 2 gms per day. So, even though you took more than recommended, it is not likely to have caused your symptoms but each person is different. I would not expect long-term or serious damage from a short term episode such as you describe. Remember that just because something is over-the-counter or "natural" it is not necessarily safe for you and more isn't always better.

Best wishes.