Shop Save My Thyroid Project NOW Foods L Carnitine, Triple Strength Liquid 16 fl. oz. Exploring the potential anti thyroid activity of Acetyl L carnitine: Lactoperoxidase inhibition profile, iodine complexation and scavenging power against H2O2. Experimental and theoretical studies ScienceDirect If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.