L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you Acetyl L Carnitine L Carnitine What Is It? Benefits, Dosage & When To Take MYPROTEIN L Carnitine: Benefits, Side Effects, and Dosage Ultimate Sup Fast&Up L Carnitine 3000 mg Triple Action Formula for Faster Fat Burn 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