L Carnitine: Benefits, side effects, and dosage Does L carnitine cause fishy body odor? Surprising Truth and Solutions Tonum L Carnitine Injection Levocarnitine IV Your urine's smell can reveal a lot about your health. A strong ammonia like odor could indicate kidney stress, while a fruity scent may suggest ketones. Sweet smelling urine might point to diabetes risk, Trimethylaminuria: Understanding and Treating Fish Odor Syndrome Urine normally has a slight smell, but some unusual and strong smells may be a sign that something's wrong.