L carnitine supplements can cause a fishy odor in the breath, sweat, and urine. This is likely due to the formation of trimethylamine (TMA). TMA is also responsible for the pungent smell of 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. Acetyl L Carnitine 500 mg 90 Caps by Klaire Labs SFI Health Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum L Carnitine Avoid Fishy Smell TikTok