Flax seed is high in omega-3 fatty acids and may enhance overall health in horses. The only natural, unsupplemented source of omega-3's in the equine diet is fresh grass. It can help reduce inflammation, which may relieve symptoms associated with sweet itch and other skin conditions. It can also alleviate symptoms of allergies. Because of its anti-inflammatory properties, it also helps in joint stiffness. In some cases, it helps so much that it can replace the use of commercial joint supplements or regular doses of bute. It also boosts the immune system and can help regulate thyroid function, making it an ideal supplement for metabolic horses as well as aging horses.