L-Carnitine: Fat Claims, Thin Evidence

The L.A. Times takes a long and considered look at the evidence that L-carnitine, a naturally occurring molecule derived from two amino acids, delivers on claims that it boosts energy and helps burn fat naturally. The short answer: while some studies suggest that L-carnitine supplements can lower blood pressure and relieve pain caused by narrowed arteries, the bit about burning fat and boosting energy is not close to nailed down, and experts quoted by the Times suggest at least one simple thing is more effective: exercise. And then there's the downside: The Times warns that getting too much L-carnitine –more than three or four grams a day– can cause nausea or diarrhea. In conclusion, one expert has this to say:
"It's another fad supplement. It won't hurt the healthy, but it won't help you, either."

Read more in the L.A.Times.