Do mRNA vaccine lipid nanoparticles circulate in the blood?

Have adequate biodistribution studies been done on mRNA vaccines? This study suggests that possibly we have not done the due diligence on the potential impact of circulating lipid nanoparticles.

Is it even relevant?

Link to paper here:
Fertig TE, Chitoiu L, Marta DS, Ionescu V-S, Cismasiu VB, Radu E, Angheluta G, Dobre M, Serbanescu A, Hinescu ME, Gherghiceanu M. Vaccine mRNA Can Be Detected in Blood at 15 Days Post-Vaccination. Biomedicines. 2022; 10(7):1538. https://doi.org/10.3390/biomedicines10071538​
https://www.mdpi.com/2227-9059/10/7/1538

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