is l-carnitine ncaa legal Banned Substances: What caffeine banned by the NCAA? NCAA Bans Celsius Energy Drink
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But its not flawlesshigh doses (above 2 grams daily) can cause nausea, diarrhea, or a fishy body odor in rare cases

Fish, such as cod and herring, also contain carnitine, although in smaller quantities than red meat

(PubMed) Pellanda H
Studies with oral d3-l-carnitine or d9-BB before versus after antibiotic exposure revealed gut microbiota contribution to the initial 2 steps in a metaorganismal l-carnitineBBTMATMAO pathway in subjects
