The function of PRDX3 (peroxiredoxin 3, Ensembl gene identifier ENSG00000165672) is as follows. Thiol-specific peroxidase that catalyzes the reduction of hydrogen peroxide and organic hydroperoxides to water and alcohols, respectively. Plays a role in cell protection against oxidative stress by detoxifying peroxides (PubMed:17707404, PubMed:29438714, PubMed:33889951, PubMed:7733872). Acts synergistically with MAP3K13 to regulate the activation of NF-kappa-B in the cytosol (PubMed:12492477). Required for the maintenance of physical strength (By similarity). {ECO:0000250|UniProtKB:P20108, ECO:0000269|PubMed:12492477, ECO:0000269|PubMed:17707404, ECO:0000269|PubMed:29438714, ECO:0000269|PubMed:33889951, ECO:0000269|PubMed:7733872}.