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 L Carnitine for Dogs: Benefits, Uses & Side Effects (Vet Reviewed) Dogster Understanding the importance of taurine and L carnitine for dogs Animal Wellness Magazine L Carnitine and Male Fertility: Is Supplementation Beneficial?