HERBAL INTERNAL POWDER (Yeast Free): Formulated by Dr. Bob Goldstein. An organic, herbal blend of Alfalfa Powder, Garlic Powder, Blue-Green Algae (Spirulina), Kelp Powder, Papaya Leaf, Nettles Leaf, Hawthorne Berry Powder. These ingredients will help cleanse the blood, bitter the blood, support circulation, help deter fleas and ticks, mosquitoes and black flies. Hot Diggity dog tested and APPROVED! Our dogs do wonderfully on this natural flea & tick herbal internal powder.