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Berberine attenuates choline-induced atherosclerosis by inhibiting trimethylamine and trimethylamine-N-oxide production via manipulating the gut microbiome

Ghorbani et al., 2017[19]

Injectable L-Carnitine (Intravenous) : It is administered directly into a vein, bypassing the digestive system, which can be useful in cases where rapid or more complete absorption is desired

This function explains the fat burning tag, and has been seen by many as the biggest reason to research and ultimately use carnitine supplements

However, its worth noting that this study used intravenous deliverynot an oral supplementin a very specific clinical context, so its difficult to generalize these results to everyday use or weight loss

Clin Diagn Lab Immunol 2(5):604608