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 Customer reviews for Nutricost L Carnitine Tartrate Supplement Powder (100 Grams) 1 Gram per Serving; 100 Servings Walmart.com Liquid L Carnitine Citrus Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum Fish Odor Carnitine TikTok