Thanks Ed. The label shows it has guarana seed extract in it, along with some other thermogenic herbal concentrates, like cayenne pepper and more than a dozen others, but it doesn't show willow bark. There is also an appetite control blend and a lipotropic blend, all herbal extracts.
I consulted my doctor before I went on it last year, and he gave me a clean bill of health and said whatever works for me, combined with diet and exercise. He is very anal about asking patients if they are taking any medications or herbal supplements, and I just saw him a few weeks ago and he gave me the okay. Well, actually he did more than give me the okay, he practically ordered me to lose weight. [:)]
rocko, I took it last year the maximum recommended 12 weeks and I did not experience any of the adverse side effects, but I will monitor how it goes.