Is botox measurable in the blood after a cosmetic injection

The doctors say no, but is it true?

A toxin test can measure 1-5 picograms of Botulinum toxin type A per milliliter of serum blood.

The specific activity in BOTOX is approx. 20 units / nanogram neurotoxin protein complex. – Page 22 of this document item 11: https://www.allergan.com/assets/pdf/botox_pi

Then a calculation:

20 units = 1 nanogram. Divided 1 by 20, 1 unit = 0.05 nanograms.

Converting nanograms to picograms: 0.05 nanograms = 50 picograms

1 Unit Botox = 50 picograms

1 100 unit injection must therefore contain 5,000 picograms of toxin.

This means that an injection of 100 units of botox (5,000 picograms) should be measurable in 5000 m / L blood, as the test can measure 1-5 picograms per milliliter of blood.