A comparative study of acetyl l carnitine and caloric restriction impact on hippocampal autophagy, apoptosis, neurogenesis, and astroglial function in AlCl3 induced Alzheimer's in rats LCarnitine Research & Benefits Studies & Scientific Use 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 A systematic review about prophylactic L carnitine administration in parenteral nutrition of extremely preterm infants