l carnitine stomach problems L-Carnitine: Benefits, Uses, and Side Effects Intestinal microbiota metabolism of l-carnitine,
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Enzymatic assays revealed the plasma and hepatic TC and TG levels

Khoshkam et al

[DOI] [PubMed] [Google Scholar] 53.Drgan G.I., Vasiliu A., Georgescu E., Dumas I

This means it contains caffeine

bottom: detailed view of carnitine bound in the active site of CntA prior to cleavage

Primary carnitine deficiencies are due to defects in carnitine transport into cells or due to defects in synthesis from lysine, although the latter are very rare with only a few cases identified worldwide
