L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians 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 Healthvit Acetyl L Carnitine (ALCAR) Capsules L Carnitine L Tartrate: 8 Key Benefits Dr. Lam Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous