Natural Gel with CitronellaClinically tested, proven effective! The London School of Hygiene and Tropical Medicine conducted two double-blind clinical studies using mosquitos which had not been fed for 24 hours and human volunteers. The tests prove conclusively that the medicines in SsssstingStop provide dependable, effective relief.Safe for you and your Family! StingStop combines three natural homeopathic (HPUS) medicines prepared from botanical sources. It contains no hydrocortisone, no antihistamines, no -caine pain killers, no synthetic medicines of any kind. Temporary relief of itch, pain, and redness of nonpoisonous insect bites and stings mosquitos, bees, wasps, etc.