Mega-Sel Equine Sore Muscle Solution is a unique selenium and vitamin E product vital to the health and performance of your horse. It's patented, liquid formula, provides selenium and vitamin E in a palatable form which is readily consumed and utilized by the horse. Powdered supplements are safe, but they may settle out of the grain, not to be consumed at all. Injectables, although effective, have potentially dangerous side effects (anaphylactoid reactions). Mega-Sel offers you both safety and effectiveness. Indications For horses low in selenium and/or experiencing muscle soreness problems. Also for use on horses prone to tying-up syndrome. Expect Results Within 14 days.