While trying to find things a bit more fitting for a 'orthomolecular medicine' practitioner (I mean an acupuncture bomb, hello) tomorrow, skin cream with fhydroflouric acid would be a nice start.
Wiki on the safety issues of hydroflouric acid below.
Spoiler Alert, click show to read:
Maybe 'restoring' the body balance of methyl mercaptan, although that will probably make everyone else vomit aswell and it isn't lethal.
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