L Carnitine Supplementation in the Diabetic Heart ABC Cardiol L Carnitine intake and high trimethylamine N oxide plasma levels correlate with low aortic lesions in ApoE transgenic mice expressing CETP ScienceDirect A 2016 study suggested L carnitine could drop a key cardiovascular risk marker by up to 12%, which sounded promising at first., But follow up research told a more complicated story, with inconsistent Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Taking a Closer Look at TMAO Dr. Radoff Gut microbiota metabolism of l carnitine and cardiovascular risk Atherosclerosis