does l carnitine help cholesterol Carnitine, Choline, Cancer, & Cholesterol: The TMAO Connection carnitine is good for something!
Description
Versatility for all Lifestyles: Whether you're an athlete, a sprinter, or someone simply looking to stay active, our L-Carnitine powder, in L-Carnitine 1000mg, fits seamlessly into your regimen, adaptable to a wide range of dietary needs and preferences
Importance in fat metabolism

Neuroscience 153 (2), 492500

For fat loss, choose L-Carnitine, but combine with a calorie deficit for results

So, while its not specifically used as an endurance supplement, it can protect us from getting sick which can decrease our endurance capabilities

Turk.J Pediatr 1998;40(1):79-84
