L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy 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 Spring Valley L Carnitine Amino Acid Dietary Supplement Tablets for Heart Health, 500 mg, 30 Count HSA FSA Eligible Walmart.com L carnitine benefits, uses & dosage: A complete guide Best Time to Take L Carnitine: A Complete Guide The Science of Good Health