With a high-purity product, this should not be an issue
Best Practices for Storing Peptides Long-Term Researchers may put lyophilized peptides in laboratory freezers when storing them for a long time
[DOI] [PMC free article] [PubMed] [Google Scholar] 241.Ilic S., Drmic D., Franjic S., Kolenc D., Coric M., Brcic L., Klicek R., Radic B., Sever M., Djuzel V., et al
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
Vegetarians and vegans might benefit from 50-150 mcg daily, or 1000 mcg a few times a week