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 Before or After Workout Which Is Better for Fat Loss ? L Carnitine for Cutting vs Bulking: How It Works in Both Phases Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L Carnitine is Underrated. New Meta Review Reminds Us Why. Carnitine for Muscle Growth: How It Supports Strength & Endurance