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This is slightly more complex than it at first appears
The active molecule of Botulinum Toxin weighs about 150kDaltons but Botox molecules have complexing proteins around them that come from the bacteria in the manufacturing process so that the Botox molecule weighs about 900kDaltons. The complexing proteins come off after injection so that the active molecule that remains is 150kDalton
there are approx 20units botox/nanogram or 5nanogram/100units Botox
ie 100 units Botox contains under 1nanogram of active Botulinum Toxin which is about 40million molecules
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