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l carnitine maxx plus ALLMAX Nutrition Liquid L-Carnitine 1500 Miligrams, Fruit Punch, 16 oz (473 ml) : Health & Household Lcarnitime Plus | Order Lcarnitime
Description
Characterization of exosomal SLC22A5 (OCTN2) carnitine transporter

Dec 2009;8(4):416-22

To our knowledge, this is the first report of a single microbial strain capable of producing TMA from one of the metabolites of the l-carnitine pathway under anaerobic conditions

Hence the physiological concentration in cells is about zero
