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. The effects of dietary L carnitine supplementation in fish diet containing high corn gluten meal on immunity, lipid metabolism, and metabolomics in juvenile hybrid grouper (Epinephelus fuscoguttatus Epinephelus lanceolatus) Aquaculture Intestinal microbiota metabolism of l carnitine, a nutrient in red meat, promotes atherosclerosis Nature Medicine Dietary l carnitine supplementation recovers the increased pH and hardness in fillets caused by high fat diet in Nile tilapia (Oreochromis niloticus) ScienceDirect