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: 
Hydrofluoric acid is corrosive and a contact poison. It should be handled with extreme care, beyond that accorded to other mineral acids, in part because of its low dissociation constant, which allows HF to penetrate tissue more quickly. Symptoms of exposure to hydrofluoric acid may not be immediately evident. HF interferes with nerve function and burns may not initially be painful. Accidental exposures can go unnoticed, delaying treatment and increasing the extent and seriousness of the injury. HF is known to etch bone, and since it penetrates the skin it essentially breaks the person's bones without destroying the skin


Maybe 'restoring' the body balance of methyl mercaptan, although that will probably make everyone else vomit aswell and it isn't lethal.