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This may especially concern redox-sensitive Cys residues in proteins and peptides, which have low pKa values (36) and are known as acidic thiols

See Table 11.7 Selenium Contents of Various Foods for the selenium content of various foods

Some more stable peptides can last 4-6 weeks, while fragile ones may show significant degradation by week 2

doi: 10.1152/physrev.00011.2005

Aim to drink plenty of water throughout the day

Tissue Repair and Cellular Regeneration BPC-157, a stable gastric pentadecapeptide, has been shown in animal studies to accelerate healing in muscle, tendon, and nerve tissue by enhancing angiogenesis and modulating growth factor expression