L-carnitine base helps move fatty acids into your mitochondria, where cells burn them for fuel. People use it for everyday energy and post-workout recovery.
Your body absorbs this standard form less efficiently than alternatives like acetyl-L-carnitine, so you often need a larger amount to get the same effect. High intakes can cause stomach upset.
If your kidneys do not work well, be careful. Your body clears carnitine through the kidneys, and it can build up.