L Carnitine Dosage for Erectile Dysfunction: What the Evidence Shows and How to Use It Safely L Carnitine Libido: What the Research Actually Shows What Is Acetyl L Carnitine Good For? Uses & Benefits Are L Carnitine and L Carnosine the Same? Anti Aging Systems 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