A new systematic review of 20 studies documents COVID-19 vaccine mRNA, spike protein, and lipid nanoparticles persisting in blood and tissues for months to years. 

When mRNA COVID-19 vaccines were first rolled out, a key selling point was their transience. The modified RNA would be translated into spike protein, trigger an immune response, and then be rapidly degraded. Simple, clean, and temporary.

Researchers Edgar Selem, Mikolaj Raszek, PhD, IMA President Dr. Joseph Varon, and IMA Director of Research Matthew Halma screened 2,470 records and assembled findings from 20 studies covering blood, plasma, breast milk, lymph nodes, brain, heart, liver, and other tissues. The result is the first comprehensive map of where COVID-19 vaccine materials have been found in the human body and how long they persist. Taken together, the pattern is clear: these materials lasted far longer and traveled far further than anyone was told to expect.

https://imahealth.org/how-long-do-covid-19-vaccine-components-really-last-in-the-body/?

AND

The persistence of COVID-19 vaccine artifacts in bodily fluids and tissues: a systematic review

https://link.springer.com/article/10.1186/s43094-026-00939-2