l-carnitine vs l-cysteine Best Naturals Acetyl 500 Mg & NAC N-Acetyl-Cysteine 600 mg : Health & Household Calcium Malete L-carnitine L-tartrate N-acetyl
Description
Proceedings of the National Academy of Sciences, 113(28), 79067911

Whether that is purely pharmacological or partly the expectation of someone who has just connected all the dots in their labs, I cannot prove

It is produced in the liver and kidneys from lysine and methionine

But if you're not exercising and not in a calorie deficit, liquid L-Carnitine will NOT burn your fat on its own
