ehhh, I'm a little leary about buying anything from ebay retailers like that. Is the mucuna standardized for L-dopa? They're providing a certificate of authenticity but who performed the test? Who's to say the mucuna you're getting is even from the same batch that was authenticated? That's like buying extacy from a random stranger in the ghetto man, it's worth an extra 10% to deal with legit sources and not end up foaming at the mouth in the ER.