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 Why Does L Carnitine Smell Like Fish TikTok 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. Buy Melanotan 2 Peptide 99%+ Pure Melanotan 2 for Research Amazon.com: Superior Labs Acetyl L Carnitine 500 mg, High Potency ALCAR, Pure Non GMO, Zero Synthetic Additives, Maximum Absorption, Energy & Fat Metabolism, Brain, Nerve & Cellular Detox Support, (200 Veg Caps) : Everything Melanotan 2 Peptide Is Revolutionizing Skin Health and Tanning