Yep! I take it all the time, especially during cold and flu season. It is fantastic for the immune system. I load up on it if I feel I'm fighting a bug, and it literally knocks it out within 24 hours. Make sure you get organic and take it a couple of times a day. I HIGHLY recommend it. (As well as garlic caps.)
This is the brand I use, it's excellent.
http://www.vitaminshoppe.com/store/e...ci_sku=G0-1003