The active ingredient in Licener is the natural Neem-extract, originating from the Neem Tree. When applied according to the directions the extract covers, immobilises and suffocates lice causing them to die.
1 Margit Semmler, Fathy Bdel-Ghaffar, Falk Gestmann et. all., (2016) Randomized, investigator-blinded, controlled clinical study with lice shampoo (Licener®) versus dimethicone (Jacutin® Pedicul fluid) for the treatment of infestations with head lice. Parasitol Res. DOI 10.1007/s00436-017-5461-7 2 Dr. F. Ghaffar et. all.,(May 2011), Efficacy of a single treatment of head lice with a neem seed extract (Licener): an in vivo and in vitro study on nits and motile stages. Parasitol Res DOI 10. 1007/s 00436-011 -2484-3 3 Dr. H. Mehlhorn, Dr. F. Ghaffar, (April 2011) et.all., Ovicidal effects of a neem seed extract preparation on eggs of body and head lice Parasitol Res DOI 10. 1007/s 00436-011-2374-8 4 W. Pittermann, W. Lehmacher, et all. 2008 Treatment against blood-sucking insects without skin irritation. SOFW J 34:36-43