Professional grade 100% Propolis Extract. Recommended to anglers by the Koi carp industry for treating minor skin abrasions and hook wounds. We think this is a vital product for helping to protect our cherished fish. It has a natural medicinal effect derived from various herbs and extracts collected by bees in nature. Provides anti-bacterial and anti-fungal protection and, being non water soluble, it will stick to the skin. Apply a light spray to the affected area and return fish to the water as normal.