How many nano grams are in a 100 unit vial of botox?

Answer 1

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

Answer 2

A 100 unit vial of Botox contains about 100,000 nanograms of the active ingredient.