Madelyn,
I have been taking Zandopa from India for a few months. Am very slowly switching from sinemet. It works on its own and 'kicks' in in about 1/2 hr. I tried mucuna and it semed to need some sinemet with it. I get it from India from following:
http://mall.coimbatore.com/bnh/zandu/zandopa.htm
Can send you the brochure by PM if you are interested.
Hope this helps!
Sunflower