Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L carnitine Could Be Beneficial in Nonalcoholic Fatty Liver Disease Patients by Improving Choline Metabolism and Reducing Liver Biomarkers European Medical Journal Evaluation of the effects of L carnitine on medaka (Oryzias latipes) fatty liver Scientific Reports