Linseed Oil 5L When you add Linseed oil to your horse’s diet, you are providing him with more fat and energy without a corresponding increase in excitability. In fact, the addition of fat can have a calming affect on your horse. It also gives him more calories without adding more grain. Linseed oil is easy to digest once your horse gets used to it, and tempers dust and loose particles that can irritate your horse, particularly if he has respiratory problems. It is also great for coats and hooves. Linseed oil gives your horse essential fatty acids, mostly Omega-6 with some Omega-3, which he needs to help absorb certain vitamins.