I've Heard Botox is Botulism So How Many Units Would It Take Before It Could Cause Me Harm?

Botox is very safe for cosmetic treatment. Neurological diseases, not cosmetic, are often treated with 10 times the amount that is used in average cosmetic treatments, without ill-effect for the large percent of those treated. Dangerous doses of Botox Cosmetic would require such a large number of vials (much more than of Botox (100 Units per vial) that it is unheard of that such a volume would be used. It has occurred, though, that a physician had used a non-Allergan source, and had ordered botox from a laboratory. Serious consequences were a result of this concentrated form that was of a much higher amount of units per volume than is found in Allergan's Botox Cosmetic.

Botox is extremely safe when performed by an MD with adequate training and experience. It would take multiple vials for paralysis or serious complications. Most cosmetic applications don't use more than one vial.

The amount of Botox that is typically placed in the muscles should not harm you.  Botox should be placed by a well trained and experiences injector.  This will be a good way to avoid any untoward effects.