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Still - the science suggests it deserves a second look

L-Carnitine Supplementation in Recovery after Exercise

Research shows L-carnitine supplementation may reduce exercise-induced muscle damage, lower markers of oxidative stress, and improve blood flow via nitric oxide signaling

This is also where caffeine dosing starts to matter more: at 10K distance the ergogenic window barely covers the race, but at half marathon length, caffeine taken 45 to 60 minutes before the gun is still actively supporting you deep into the second half

24 : 4350 Toth E, Harsing LGJ, Sershen H, Ramacci MT, Lajtha A

These high quality studies also showed that the improvements were more impressive in individuals who had the lowest quality of sperm