51�Թ�

The substance is injected deeply into the muscle and typically consists of oil, benzyl alcohol, and lidocaine, according to a 2009 review on the usage of Synthol in bodybuilding.

Testing revealed an elevated presence of benzyl chloride in a lab, she said.

A benzyl ring might rotate, or organic-chain links flex and stretch.

Boos adds that the prescription Ulesfia – for which the active ingredient is benzyl alcohol – is also a good option to effectively kill lice in young kids, since it's approved for children 6 months and older.

A third prescription option is Ulfesia, which has been available since 2009 and is made with benzyl alcohol that suffocates the lice but doesn't harm the eggs.