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 L Carnitine: Does it help with weight loss? Fish Odor Carnitine TikTok 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. 250g (8.8oz) NEW 100% PURE ACETYL L CARNITINE (ALCAR) 857930006264 eBay