What source is Botox Cosmestic derived from?

BOTOX® Cosmetic contains tiny amounts of a highly purified botulinum toxin protein refined from the bacterium, Clostridium botulinum. Formulations, potency, and approved doses vary among botulinum toxin products, which means that one product cannot take the place of another. Those are a few reasons why there is no such thing as a “generic” form of BOTOX® Cosmetic. There have been no studies to support that other products are Unit-to-Unit equivalent to BOTOX® Cosmetic.
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How does Botox Cosmetic does?

BOTOX® Cosmetic targets one of the underlying causes of frown lines and crow’s feet—the repeated muscle contractions from frowning and squinting over the years. Your specialist will inject these muscles with BOTOX® Cosmetic to temporarily reduce muscle activity. You will begin to notice a visible smoothing of your crow’s feet lines and frown lines between your brows.
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What should I expect with treatment?

You may begin to notice results within 24 to 48 hours for moderate to severe frown lines, with results lasting up to 4 months.