Your body makes it in the liver and kidneys and stores it in the skeletal muscles, heart, brain, and sperm. Usually, your body can make all the carnitine it needs, even vegetarians.
Creatinine is a waste product. It is produced by the breakdown of
levels than the average person. Creatinine is filtered from the blood
by the kidneys and removed from the body in the urine. It is a good
indicator of kidney function and is used in the diagnosis of kidney
disease.