L Carnitine: Benefits, Side Effects, Uses, Dosage and Research Did You Know? Some people report a fishy smell after supplementing with L carnitine. This happens because certain gut bacteria convert carnitine to trimethylamine, a malodorous compound found in rotting fish. Carnitine and Acylcarnitine Analysis Service LCMS MS Quantification Creative Proteomics Effects of l carnitine supplementation on blood pressure: a systematic review and meta analysis of randomized controlled trials Journal of Human Hypertension Carnitine Deficiency MD Searchlight