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L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute 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 L Carnitine Side Effects: What's Real (2026) l carnitine fishy body odor side effect trimethylamine Trimethylamine N Oxide: The Good, the Bad and Trimethylaminuria (Fish Odor Syndrome or TMAU)
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