“There’s not a single study showing that the messenger RNA is broken down…”

The mRNA in the vaccine is designed to self-amplify when delivered into cells, which generates a “strong immune response and the potential for extended duration of protection.” The vaccine is intended for primary immunization (2 doses) as well as booster immunization in adults. Kostaive is the “world’s first approved product applying self-amplifying mRNA technology,”

https://www.zerohedge.com/covid-19/japan-approves-worlds-first-self-amplifying-mrna-covid-19-vaccine-without-published