0_Apprentice
I like to take L-Carnitine for my long runs, it seems to help my endurance. Do you take any supplement?
1_Wizard
I don't, no. I know Carnitine was discovered in 1905, so it has been used for a long time, but I just try to follow the principles of good nutrition. 
0_Apprentice
Yes that too, but I believe athletes are always looking for an edge. and as long as it is legal to use it is ok.