l carnitine running performance L-Carnitine, Athletic and Longevity L-carnitine can boost your endurance...
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What is L-Carnitine and what is it good for

Retrieved from WebMD

Patients should report severe or persistent injection site reactions, as these may indicate hypersensitivity or anaphylaxis requiring immediate medical attention

Biochem J 1997
It also encourages healthy cognitive function and promotes healthy cellular energy metabolism, so your mind stays as strong as your muscles