The blood thinner warfarin, which prevents blood clots, owes its existence to some cows who got very sick after eating spoiled hay — and to a chemist who spent years trying to figure out why.

The experimental drug is based partly on the venom of the eastern green mamba snake.

Sweet clover hay is the source of warfarin (Coumadin), another often-used anticoagulant in people with atrial fibrillation: This may be the source of confusion.

Sweet clover hay is the source of warfarin (Coumadin), another often-used anticoagulant in people with atrial fibrillation: This may be the source of confusion.

Sweet clover hay is the source of warfarin (Coumadin), another often-used anticoagulant in people with atrial fibrillation: This may be the source of confusion.

Best Testimonial. Physicians who had no objection to using a drug made from rotted clover that killed cattle were more wary of one touted as a rat poison. But warfarin, believes Chemist Link, is ...

Eventually research conducted at the University of Wisconsin revealed that an anticoagulant called dicumarol was the plant-based anticoagulant found in spoiled sweet clover.

Similarly, on the clotting factor side, a veterinarian in Wisconsin figured out in the 1920s that the cows who had abnormal bleeding had eaten sweet clover, and researchers at the University of ...

Sweet clover hay is the source of warfarin (Coumadin), another often-used anticoagulant in people with atrial fibrillation: This may be the source of confusion.