L carnitine ameliorated fasting induced fatigue, hunger, and metabolic abnormalities in patients with metabolic syndrome: a randomized controlled study Nutrition Journal Springer Nature Link Unlock Peak Performance & Fertility with L Carnitine! Did you know that injectable L Carnitine is a game changer compared to oral supplements? While oral L Carnitine has low bioavailability (only ~14 18% L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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 Injection: Maximize Fat Burning, Energy & Metabolism