L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Happy Supplement Sunday! Each of the supplements displayed in today's graphic have some scientific evidence supporting a benefit on liver enzyme (and potentially other markers) levels in people living with a fatty Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L carnitine can promote liver regeneration after hepatectomy in mouse. Download Scientific Diagram