Medikoi Health food from NT Labs Medikoi health food is the ideal way to support the immune system of your koi through the foods unique ingredients: including lemon peel, olive leaf, Atermesia and Propolis amongst others, which is great at speeding up recovery time. Another vital ingredient is Stimune, this heals the fish\'s natural immune system to fight infection. Medikoi health contains a unique natural herbal formula developed in our laboratories which helps to maintain resistance to disease and a wide variety of infections.