Do you or someone you love smell like fish? It could be Fish Odor Syndrome! #fishodorsyndrome #fishy #fishysmell #fishodor L Carnitine Fishy Odor for Girls TikTok L Carnitine (Orange) Outlastlabz Injectable L Carnitine: Does It Really Work for Fat Loss? 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.