Acetyl L Carnitine 500 mg Acetyl L Carnitine Powder Fullscript Acetyl L Carnitine 500mg Cognitive Support Carlson ACETYL L CARNITINE 500 mg 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 Spring Valley Odor Controlled Garlic Dietary Supplement Softgels for Heart Health, 1000 mg, 200 Count HSA FSA Eligible Walmart.com