does l carnitine make your pee yellow L-Carnitine: Everything You Need to Know Carnitine Deficiency: What Is It,
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trimethylamine is efficiently absorbed and metabolized to trimethylamine- N -oxide, which is excreted in the urine (13)
Age-associated deficit of mitochondrial oxidative phosphorylation in skeletal muscle: role of carnitine and lipoic acid

A long-term, randomised, double-blind, placebo-controlled study

(PubMed) Osio M, Muscia F, Zampini L, et al
