Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis L carnitine levels decrease with age, contributing to aging and a decline in mitochondrial function. The list doesn't stop there. L carnitine supports: Joint health L carnitine has been shown to support joint comfort The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Acetyl L Carnitine New Roots Herbal L Carnitine Linus Pauling Institute Oregon State University