There appear to be different people saying different things about which species to use.
I suspect those who get a response use one species, those who don't use another. Now if we could only figure out which is which. I have read Fullers Teasel (Dipsacus fullonum, syn. Dipsacus sylvestris) is not the one you want but who do you trust? The others are Dipsacus asper, D. chinensis and D. japonicus.
Does anyone have that info on their bottle? Did it work?
For anyone who buys it from now on, can you ask which species and report what you bought and how you went?