L Carnitine Dosage Guide: How Much Should You Take? When should I take L Carnitine? Inshape Nutrition 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 L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Still confused about L Carnitine? In this reel, he explains how Muscle Food L Carnitine works inside your body. A naturally occurring amino acid that helps convert stored fat into usable energy. The Body Attack L Carnitine capsules provide 500 mg