Blue Lotion by McTarnahans is a barn favorite. Blue Lotion helps with soreness and stiffness a horse may experience after overexertion. 
Product Details:
May be used as an aid in the temporary relief of minor soreness and stiffness caused by overexertion
Blue lotion is a non-greasy liniment counter irritant
May be used under absorbant cotton and bandages
Effective sweat with the proper addition of plastic wrap.