Copied from the Red Horse Products' website:
 
Field Paste cleanses and conditions the underside of the horse’s foot, helping frogs and soles stay strong and healthy. Its ingredients support the natural growth of healthy tissue, especially when rubbed well into the surface of the frog. The active agents also help the hoof and frog tissue to toughen without being caustic or damaging. The thick, paste-like consistency allows Field Paste to stay in the deep grooves of the foot for longer than thinner solutions.
 
Red Horse Product's website price - £19.00