When in case of lack of zinc in feed. For horses with a weakened immune system, or with mud fever, eczema or other skin conditions. Zinc is a mineral that has a central role in several enzymatic activities that, among other things, affect the body's immune system, skin and coat. Deficiency affects all parts where zinc is included and often manifests itself in the form of a weakened immune system or skin conditions. 6 ml (4 g) per 100 kg body weight per day or based on calculated feed state. Ex. Horse 500 kg, 30 ml / day. Package: 1 pc.