How to Choose the Best L Carnitine Supplement: A Smart Shopper's Guide Life Extension Supplement of the week: L Carnitine! This one doesn't just boost fat metabolismit can also improve recovery, endurance, and even brain function. If you're serious about performance and longevity, this might be Buy Mars By GHC Apple Cider Vinegar Capsules Online Best Price Acetyl L Carnitine is more thought of as a fat burner. It's actually powerful tool for athletes looking to improve endurance, energy, and mental performance. Here's how you can integrate it into your routine for