There are some different herbs out there, advertised as cribbing deterrents for horses. These include horse chestnut, peppermint oil, horsebalm, and horse rolls.
Horse chestnut is an herbal extract from horse chestnut trees. It's a traditional European herbal remedy for horse hoof pathology and varicose veins in humans. It can improve blood circulation and relieve swelling in the horse's hooves, but it seems to have no effect on cribbing or wind sucking.
Peppermint oil has been used for humans for years as a natural remedy to soothe upset stomachs and help with nausea. It has been used as a horse cribbing deterrent as well, but the benefits of horsemint oil for horses haven't been scientifically proven.
Horse balm is commonly advertised as a horse cribbing treatment, but there are no studies supporting the claims. Some horse owners report using horse balm successfully, though. However, horsebalm can also be used to calm horses, so it may work to decrease cribbing if the horse is agitated or stressed.
Horse rolls and horse roll supplements do not appear to be effective horse cribbing treatment, even though they contain horse chestnut extract and peppermint oil.
It's important to note that there is limited horse research on herbs and supplements. You should never use horse supplements without consulting your veterinarian.