Injectable l carnitine has 100% bioavailability and it's a supplement, not steroid. Even as a natty you can use and it can also help you in your bulking process, not just in fat 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 for Cutting vs Bulking: How It Works in Both Phases 6 Benefits of L Carnitine Injections MedHealth 360 L Carnitine Injectable: Boost Energy and Metabolism