Thanks so much for the replies everyone! It's reassuring to hear from others in the same situation. Thanks especially to Alan - good to hear a professional opinion.
The label on the bottle says that it contains 500mg of ginger root, and the recommended dose is 2 tablets every 4 hours. But I have never taken any more than two in a day. I think that if I stick to that amount (2/day) I should be OK.
Another quick question - does B6 do pretty much the same thing as ginger, or is it more for bloating, and keeping your digestive system running smoothly? I noticed in the store that it was listed as a digestive aid, or something like that. Should I take both?