L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage What Is CoQ10 and L Carnitine, and How Can It Change Your Life? iThrive Essentials 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 Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous 5 Worthy Holistic Reasons to Use Propionyl L Carnitine