Repel Anti-lice Prevent Hair Spray protects the hair from lice colonization without disturbing the micro-environment of the scalp, without drying or greasing the hair. Its specially designed composition contains IR3535, for safe and hygienic protection. Its composition also ensures that the repulsion of lice is maintained for at least 48 hours after application. This gives the advantage of being placed every 2 days and not every day like almost all other similar products.    Main active ingredient: IR3535 is a powerful and at the same time safe insect repellent, derived from the β-alanine molecule and recommended by the World Health Organization.