A Pfizer preclinical study has appeared in multiple incarnations, each prompting similar panic.
FDA document (released March 2022):
2021-05-07 "Japan shares biodistribution study of Pfizer COVID-19 vaccine"
2021-05-11 Byram W. Bridle, Ph.D interviewed about the Japanese document
2022-11-09 "Japanese Biodistribution study that Dr. Byram Bridle warned about…"
2023-03-24 "Australian government biodistribution data" - Dr. John Campbell
2023-03-26 "Professor Clancy responds to TGA document" - Dr. John Campbell
The experiment involved 150g rats and 50mcg doses of mRNA vaccine. This dose is equivalent to about 767 doses in a 70KG or 154lbs human. Concentrations of lipid nanoparticles (LNP) were measured in 33 locations at 7 time intervals up to 48 hours after injection. Varying concentrations of LNP were detected throughout the bodies.
The purpose of these studies is to reveal potential harms in a worst case scenario (extremely high dose). None were identified.
Conspiracists main argument is that this study proves that "they" lied when they said that the vaccine stays in the injection site. However, no examples are known to have been cited that entirely rule out trace quantities of LNP elsewhere in the body.
Health Fedback review of Byram Bridle's claims about the Japanese biodistribution study (2021-05-28)
“COVID-19 vaccines are going to sterilize our womenfolk,” Take 2 (2021-06-07)
Thread by Dr. Viki Male