L Carnitine for Dogs: Key Benefits that Every Pet Parent Must Know! L Carnitine: Benefits, side effects, and dosage 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: Key Benefits that Every Pet Parent Must Know! L Carnitine for Dogs: Benefits, Uses & Side Effects (Vet Reviewed) Dogster