l carnitine experiment Optimizing endurance performance in elite swimmers: effects of L-carnitine supplementation and hydration strategies | Applied Water Science Carnitine: the claims and why
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This happens often to vegetarians and vegans or people who suffer from genetic disorders, but such issues are rarely attributed to carnitine deficiency
TABLE 1 Carnitine transporters involved in cancer

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doi: 10.1016/j.mce.2011.05.047 10 ThanasCZirosPGChartoumpekisDV

The effective clinical dose is 500-2000 mg daily