is l-carnitine hard on the kidneys Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Before I came across LeGARDE
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Studies have shown that taking a caffeine supplement before your run can improve endurance by 7 to 9 per cent when combined with carbohydrates, can increase leg power by up to 7 per cent, and can even reduce a 1500m run time by 4.2 seconds

Carnitine: A Neuromodulator in Aged Rats

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National Institutes of Health: Health nformaton: The Kidneys and How They Work
In obese individuals, for instance, LC decreases all free fatty acids by delivering them to the mitochondria (Isaeva and Gapparova, 2018)
