In a rat study they injected mRNA vaccine into the muscle and the rats all were fine, injected into the blood and they all got visible heart damage on autopsy. The dose used was about 3x higher than human dose (adjusted for size). At lower dose there was less damage.
So basically if the nurse puts the needle in the wrong place or it gets into your blood somehow then you're fucked.
My guess is that men have it worse primarily because they exercise after and squeeze the juice out of the muscle and into nicked veins or toward lymph nodes, or have less fat. Have not seen any study on mRNA in fat, but my guess is that there's low blood flow so less likely to get myocarditis.
In a rat study they injected mRNA vaccine into the muscle and the rats all were fine, injected into the blood and they all got visible heart damage on autopsy. The dose used was about 3x higher than human dose (adjusted for size). At lower dose there was less damage.
So basically if the nurse puts the needle in the wrong place or it gets into your blood somehow then you're fucked.
My guess is that men have it worse primarily because they exercise after and squeeze the juice out of the muscle and into nicked veins or toward lymph nodes, or have less fat. Have not seen any study on mRNA in fat, but my guess is that there's low blood flow so less likely to get myocarditis.
edit: this is the study, but it was mice not rats