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 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 L Citrulline: A Non Essential Amino Acid with Important Roles in Human Health