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 L Carnitine vs L Arginine: Understanding Their Differences and Benefit Fitness Health L Carnitine Supplements Nature's Best L Carnitine: Benefits, Uses, Side Effects, and More