abcam glutathione assay kit Peroxidase (Colorimetric) Absorbance is read at ~400 nm for GSH and ~356 nm for total mercaptens. GSH/GSSG Ratio Detection Assay Kit

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This compromised immunity is thought to be due to decreased glutamine availability for immune cells and some research has confirmed that glutamine supplementation can decrease the risk of upper respiratory tract infections in athletes after intense training

This may be due to issues with hair follicles, hormones, and more

Good sources: Eggs (rich in cysteine) Legumes and lentils Poultry, fish, and lean meats Seeds (e.g., sunflower, sesame) Bone broth or gelatin (for glycine) Eat Foods That Support Glutathione Metabolism Some foods contain small amounts of glutathione or help your cells upregulate its production and recycling: Spinach, avocados, and asparagus contain natural glutathione Whey protein (undenatured) is rich in cysteine and supports synthesis Plant compounds like those in turmeric may activate cellular antioxidant response pathways (e.g., Nrf2), increasing expression of glutathione-related enzymes Important note: Glutathione from food is largely broken down during digestion, so these foods help mainly by supplying building blocks and activating your bodys own glutathione production