Leeches are approved as medical devices by US FDA
But do you know we Indians have been using them since centuries for treatment #raktamokshan or blood letting as we call it is an important part of Ayurveda.
They release heparin which prevents regional blood clotting
Hirudotherapy can be used in the treatment of conditions including migraine, atherosclerosis, Alzheimer’s disease, infertility, hepatitis, cystitis, sinusitis, glaucoma, chronic renal failure, and many more. There is even some evidence that chemicals extracted from leech saliva might help to prevent cancer metastasis and relieve cancer-related pain.