amino acid
L-Carnitine
Transports fatty acids into mitochondria for energy production.
What it’s good for
L-Carnitine for Low Stamina
Mixed6 studies · 3 supporting · 2 against
6 safety notes
Helps you burn fat during exercise, sparing the stored carbohydrate you need later.
Dose: 1000–2000 mg
L-Carnitine for Afternoon Energy Crash
Mixed2 studies · 1 supporting · 1 against
7 safety notes
Helps brain cells make energy and supports the messenger behind alertness.
Dose: 500–1000 mg
L-Carnitine for Chronic Fatigue
Not verified2 studies · 2 supporting · 0 against
6 safety notes
Why it gets suggested: Carries fat into the part of the cell that burns it for energy.
Dose: 500–2000 mg
Tested as: Acetyl-L-carnitine and propionyl-L-carnitine (studied together in a single open-label CFS trial; evidence grades C by the citing review)
Why we could not verify it: The research we could find tested Acetyl-L-carnitine and propionyl-L-carnitine (studied together in a single open-label CFS trial; evidence grades C by the citing review). That is a different preparation, and a result for one form is not a result for another.