L-Carnitine is generally considered safe when taken at recommended doses
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For this reason, some people suggest that L-citrulline may be better for increasing arginine levels
Roberts AB, Gu X, Buffa JA, Hurd AG, Wang Z, Zhu W, Gupta N, Skye SM, Cody DB, Levison BS, et al
Liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based quantitative methods are one of the most commonly used techniques, with the advantage of being able to efficiently separate and detect a variety of carnitine and its derivatives, including free carnitine, acylcarnitine, and their isomers and odd forms