L Carnitine Liquid 3000 mg, 16 oz. NOW Foods Fruitful Yield 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 is Underrated. New Meta Review Reminds Us Why. Hunger Management: 8 Tips for Controlling Cravings MYPROTEIN The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.