It is important to work out why your horse may have bruised heels. This may just be because you horse is walking over unusually rough ground or it maybe related to the hoof trim. You can soak your horses hoof in Epsom salts with some herbs added such as comfrey or arnica. You can poultice the hoof with comfrey leaf or ointment. Consider feeding rosehips and a natural mineral supplement such as kelp or bladderwrack.
An ointment can be made with any of the following herbs: comfrey, arnica (on unbroken skin), calendula, chickweed, lavender, plantain, sage, St John’s Wort or rosemary…just to name a few. Witch Hazel is another popular remedy.