Carnitine: the claims and why it may not work L Carnitine Benefits for Male Erectile Dysfunction Most nerve supplements look impressive on the label. Until you compare the doses to what the clinical trials actually used. As a Fellowship Trained Peripheral Nerve Surgeon with 3,000+ nerve procedures, here is New Roots Acetyl L Carnitine 750 mg 90 Capsules Unbeatable Prices, Daily Deals VITASHOP 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.