The sperm maturation requires a high amount of carnitine that is accumulated in epididymal cells from blood, thanks to OCTN2 (Figure 2)
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And pursuing mRNA vaccines at full speed did not stop the government from also pursuing traditional vaccines and investigating other covid therapies, just as the field of addiction will continue to pursue improvement and expansion of use for existing medication classes
Only a fraction of the oral dose actually reaches systemic circulation
But that entire safety dataset is three small animal studies with no formal toxicology arm, no dose escalation, no repeat dosing, no long-term follow-up, and nothing in humans