Underwood’s is a Veterinary Health Product (NN.L2NO) that promotes skin health and supports the natural defenses of the skin. It may be used as part of a general cleaning routine for all horses in support of natural defences of the skin and supports healthy tissues. Underwood’s contains (per 473ml bottle): 20.21ml Iodine (Potassium Iodide), 15ml Copper Sulfate and 0.2ml Povidone-Iodine.