According to leaked documents from Pfizer, the highest concentrations of lipid nanoparticles of the vaccine in animal models after 2 days were in the following locations:
- Injection site: 165 μg/g
- Liver: 24.3
- Spleen: 23.4
- Adrenal glands: 18.2
- Ovaries: 12.3

— Abazar Habibinia, MD (@AbazarMd) October 11, 2021