l carnitine before exercise benefits of workout L carnitine supplements bioavailability is very less and according to Best Time to Take L-Carnitine:

Your harder and longer workouts ultimately aid in fat loss

Int J Hum Rights Healthc 15:1730 Asano Y, Hiramoto T, Nishino R, Aiba Y, Kimura T, Yoshihara K, Koga Y, Sudo N (2012) Critical role of gut microbiota in the production of biologically active, free catecholamines in the gut lumen of mice

NSI-189 is a novel benzylpiperazine-aminopyridine compound, which has been investigated for the treatment of major depressive disorder (MDD) amongst other cognitive deficits

Cagle JL, Young BD, Shih MC, et al

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Of course, in these conditions, we recommend consulting with a doctor before use to be sure that L-Carnitine is being dosed effectively to provide genuine benefits for you