Thunderbrook EquestrianSkin Respirationis a healthy blend of fruits, herbs and botanicals to nutritionally support healthy respiratory functions and healthy skin in horses and ponies. Composition Spirulina pratensis, Ginkgo Biloba, Burdock, Calendula, Cleavers, Milkthistle, Chamomile, Hawthorn, Nettle, Licorice, Vitamin C.