I think it does....i was on the pill and a month after starting slimquick i lost 8lbs. i missed my period the and found out i was 4 weeks pregnant....I had a healthy baby by the way :)
I've often wondered that myself. There is a sticker on my birth control that says diet or herbal supplements may decrease the effectiveness of my birth control. I had to call the pharmacist to see. Then the pharmacist couldn't always tell me whether or not it would. So, I'd try it and see...and knock on wood, I haven't had any problems as far as that goes.