is using l carnitine ethical L-Carnitine Benefits, Uses, Dosage, Foods, Side Effects Artificial Sweetener Does L-Carnitine Really Work? An
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10.1016/j.clnu.2017.11.001 48 HirasawaA.TsumayaK.AwajiT.KatsumaS.AdachiT.YamadaM.et al

Journal of pain and symptom management , 32 (6), 551-559

Abstract Background It has been demonstrated that acute GPLC supplementation produces enhanced anaerobic work capacity with reduced lactate production in resistance trained males

In comparison, acetyl l carnitine by itself stimulates such growth by "only" 5.6%, while a combination of acetyl l carnitine and l arginine taken separately achieves a growth rate of 5.2%