The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions 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. Symptoms of B12 Lipotropic L Carnitine Deficiency VITAstir IV Therapy & B12 Shots Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications