Injectable L Carnitine How It Works & What to Expect? L Carnitine Injection: Benefits, Dosage And Risks The Role of L Carnitine in Distance Athletes Compounded Carnitine (L) Injection Empower Pharmacy 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