Hedrin Spray Gel 1 Hour is a new formula and is clinically proven to kill head lice and eggs. Hedrin Liquid Gel eliminates head lice and their eggs in adults and children aged 6 months and over. Hedrin Once Spray Gel is a fast-acting solution that gets to work in just 15 minutes. This thicker gel formulation contains Dimeticone and Penetrol to penetrate head lice eggs and kills head lice with just one application. The Hedrin range is proven in clinical trials to be incredibly effective at killing head lice, but is specially formulated to suit your preference and lifestyle. Each product contains a physical mode of action that lice cannot develop a resistance to. They do not require combing once applied, they are all skin friendly. They have no unpleasant odours or asthma triggers and can be used on babies from 6 months old.