l carnitine transports fatty acids into mitochondria Activation and Transportation of to the via the Shuttle with Animation Function of carnitine in the
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Dig Dis Sci 66(7):2394-406 2021 PMC7854862 Eastment MC, Berry K, Locke E, Green P, O'Hare A, Crothers K, Dominitz JA, Fan VS, Shah JA, Ioannou GN

The proposed solution was to replace the C 8 fatty acids with C 7 fatty acids, which, after 2 rounds of chain-shortening, produce a C 3 remnant which is converted to succinate, thereby refilling the TCA cycle (anaplerosis) (7)

10.1016/j.bbrc.2017.12.069 61 LiX.GengJ.ZhaoJ.NiQ.ZhaoC.ZhengY.et al (2019)

Mental-energy positioning: Acetyl-L-carnitine is frequently chosen when the commercial brief is cognitive or mental-energy support rather than only workout support
