L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage 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 Nutrex L Carnitine 3000 Liquid Energy & Metabolism Tiger Fitness BodyTech L Carnitine 3000 Supports Fat Metabolism, Energy Production eBay Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous L Carnitine ProSupps.com