Carnitine Blend Rootcology 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. L Carnitine: What it's used for, benefits and how to take it correctly Justloading L Carnitine: Benefits, Uses, Side Effects, and More L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute