All-Natural Food-Grade grease infused with capsaicin (the heat from Chili peppers). Horse grease has been scientifically-tested and Veterinarian-proved to stop horses, mules, and donkeys from chewing. Most available products are either toxic or made from harsh chemicals and results are poor at best. Can be applied to any surface. When applied to wood it will soak in and last for years. When applied to non-porous surfaces be aware it will stay active and can be transferred to people. Easy to use and apply. Shelf-life is unlimited. Use for fences, bandages, manes, and tails.