l-carnitine wikipedia romana (fumarate) L-Carnitine - Arazo Nutrition
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doi:10.1016/j.nbd.2024.106423 148

If your concern is preventing nutritional deficiency and supporting general energy levels, B12 has the stronger case
It has a long history of use in cosmetics and has been added to soft drinks, ice cream and other processed foods as a flavoring

10 mmol/l final concentration) in phosphate buffer (pH 7.0) as the substrate
10.1503/jpn.200159 J Psychiatry Neurosci

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