12 Urine Smells Explained Pharmacist Neeraj Bharti Innovator Pharmacy Innovator Academy 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. 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 3000 Liquid 3000 mg Carnitine Supplement Zero Calorie Zero Sugar Keto Friendly for Men and Women Great Tasting 31 Servings (Patriot Pop, 16 fl. oz Walmart.com Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Understanding Urine Smells: Causes and Solutions