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The seven participants who did not complete the study testing included three individuals that developed musculoskeletal injuries from other activities (intramural sports), two that did not maintain consistent levels of exercise training, and two that declined to participate in the final sprint testing session

The bioavailability of supplemental acetyl-L-carnitine has not been as well studied, though some evidence suggests slightly higher circulating concentrations compared to equivalent L-carnitine doses, with peak plasma levels typically achieved 24 hours after oral administration [5][12]

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Acetyl-L-Carnitine: L-Carnitine with an extra acetyl molecule group

Furthermore, several of the ADHD studies ran for only six weeks, which may not have been long enough to detect an effect with ALCAR