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 Benefits of L carnitine injections are aplenty! This injection is a great way to boost your energy levels, help with weight management, and even promote healthy heart function. Studies show that Amazon.com: Force Factor L Carnitine Supplement, L Carnitine Tartrate 1000mg Capsules to Convert Fat Into Energy, Support Muscle Recovery, and Boost Exercise Performance, Vegan, Non GMO, 90 Tablets : Health & Household Nutrex Liquid Carnitine 3000 by Nutrex: Lowest Prices at Muscle & Strength What Is CoQ10 and L Carnitine, and How Can It Change Your Life? iThrive Essentials