Watermelon isn't just a refreshing treat. When it's ripe, it's also got plenty of an antioxidant called glutathione. It strengthens the immune system, so it can fight infection. https: wb.md 4uMLihz Setria For Sport by Kyowa Hakko: The Science Behind Glutathione + Citrulline for Athletic Excellence The Emerging Role of Citrulline and Theanine in Health and Disease: A Comprehensive Review Is L Arginine and L Citrulline Good for Erectile Dysfunction? Glutathione and Citrulline Supplement Market l Arginine induces antioxidant response to prevent oxidative stress via stimulation of glutathione synthesis and activation of Nrf2 pathway ScienceDirect