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L-citrulline is converted into L-arginine in the body, which also produces nitric oxide, while L-arginine can be converted directly into nitric oxide

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Gupta et al., 2022

Int J Mol Sci 13:20782090 Vieira Neto E, Fonseca AA, Almeida RF, Figueiredo MP, Porto MA, Ribeiro MG (2012) Analysis of acylcarnitine profiles in umbilical cord blood and during the early neonatal period by electrospray ionization tandem mass spectrometry

Another study found that topical application of glutathione reduced the appearance of acne scars and hyperpigmentation