The difference between L Carnitine and Acetyl L Carnitine (ALCAR) Health4All Ever heard of L Carnitine? , It helps your body turn fat into energy, boosts endurance, and speeds up recovery. , You can find it in liquid or capsules (I prefer liquid 1100mg or 3000mg)., If L Carnitine is Underrated. New Meta Review Reminds Us Why. The adverse effects of long term l carnitine supplementation on liver and kidney function in rats L Liu, D M Zhang, M X Wang, C Y Fan, F Zhou, S J Wang, L D Kong, 2015