Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous In terms of fat burning ability.. L Carnitine may not be the brightest star in the sky, but it has another effect that few people actually know about. This content is for educational Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window Acetyl L Carnitine 500 mg The anti catabolic effect of a couple of grams of L carnitine L Carnitine for Weight Loss: My Honest Experience & How It Burns Fat