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intestinal microbiota metabolism of l-carnitine a nutrient in red meat JCI Diet-gut microbiota interactions on cardiovascular
Description
Digestive side effects that can occur with L-carnitine supplements include upset stomach, diarrhea, nausea, and heartburn

[DOI] [PubMed] [Google Scholar] 32.Busquets S, Serpe R, Toledo M, Betancourt A, Marmonti E, Orpi M, Pin F, Capdevila E, Madeddu C, Lopez-Soriano FJ, et al

doi: 10.1371/journal.pone.0019258

Transparent Labs says that they omit creatine because caffeine blunts its effects when taken together, but research on that topic is scarce and inconclusive

Here are some of Zenkers recs: So, L-carnitine is a lot simpler than its name lets on
