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Methods Enzymol 1(541):310 Lawrence RA, Burk RF (1976) Glutathione peroxidase activity in selenium-deficient rat liver

It contributes to biochemical pathways involved in converting nutrients into usable energy, supporting general vitality and metabolic balance

Explored as a possible aid for recovery and lean-mass preservation in frail or catabolic populations, though a Merck-sponsored Phase 2b trial in elderly hip-fracture patients (Adunsky et al., 2011, Archives of Gerontology and Geriatrics, PMID 21067829) was halted early over a cardiac safety signal rather than demonstrating a clear functional benefit

Some medications, like GLP-1 drugs for obesity, are also peptides