Barrier Livestock Louse Powder is a fully HSE approved. A 100% natural insect repellent for use against biting and blood-sucking lice by direct application to horses, ponies, donkeys, cattle, goats, rabbits and other small pets. One application remains active for up to six weeks depending on weather conditions. Suitable for use in organic farming systems. Note: efficacy will be affected if used in conjunction with chemical-based products. HSE licence no: 8712.