Cold and flu season is upon us, so you might want to check out this interview with infectious disease specialist John Swartzberg, M.D., chair of the editorial board of the UC Berkeley Wellness Letter. It’s full of interesting and helpful information, such as Dr. Swartzberg’s thoughts on zinc supplements:

“The research suggests zinc may be modestly effective. The theoretical reason why zinc might work is that it may help prevent the cold virus from replicating. But the clinical trials have been mixed. Do I take it? Yes, but it’s hard to know if it helps. If it’s taken as directed—and not for a long duration—it doesn’t appear risky. If you want to try it, go ahead. Just don’t use any zinc product that goes directly to your nose, because it may permanently damage your ability to smell.”

To read more about how often you should be washing your hands to prevent colds, how long a cold virus can last out in the world, and the effectiveness of supplements like vitamin C or D, read the whole interview. You may need to access it on your phone or home computer.