Worm therapy?

Worm therapy?When I saw a jar of this stuff the other day, I misread the label and it set me wondering.  What exactly is worm therapy?  Is it for people or animals who suffer from worms?  Is it to help worm-breeders achieve a healthy harvest?  Is it a jar of worms for use in some new medical treatment like helminthic therapy?  Or is it a very old therapy: after all, the one “sure cure for all diseases” involves worms.

Needless to say, I have not opened the jar.