l carnitine marathon running L-carnitine can boost your endurance... But give it time Carnitine Capsules are your ultimate companion for turning stored fat into sustained energy Mo Farah: Doctor says L-carnitine

However, genetic or medical reasons can cause some people produce too little

Effects of nine weeks L-Carnitine supplementation on exercise performance, anaerobic power, and exercise-induced oxidative stress in resistance-trained males

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Another placebo-controlled, double-blind, randomized study in 44 men with idiopathic asthenozoospermia found an increase in sperm motility in those given ALCAR alone (3 g/day) or ALCAR (1 g/day) plus L-carnitine (2 g/day) compared to those given L-carnitine alone (2 g/day) or a placebo (113)

Rare mutations in SLC22A5 can cause hypoglycemia and liver problems from infancy, and this is one of the genetic conditions that is usually screened for at birth

Improved Exercise Performance: L-Carnitine Base has been associated with improved exercise performance, endurance, and reduced muscle fatigue