Acetyl L Carnitine: Benefits and Side Effects Gene Food Body odour isnt just about deodorants or perfumes it starts from within. The food you eat plays a powerful role in balancing your bodys natural scent, keeping you fresh, confident and healthy. Try Unlocking the Health Benefits of L Carnitine and Potential Side Effects Your Health Magazine 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.