Turmeric is a spice commonly used in human cooking that has been gaining popularity as a natural supplement for horses. It contains a compound called curcumin, which is believed to have anti-inflammatory and antioxidant properties that may benefit horses in several ways. Turmeric is often fed to horses to support joint health, aid in digestion, and promote a healthy coat. It may also have immune-boosting effects and could help horses with respiratory issues or allergies.