Se-Methylselenocysteine (CAS 26046-90-2) is an organoselenium compound that serves as a selenium donor and is investigated for its chemopreventive properties It is metabolized in vivo to methylselenol which is believed to modulate cellular redox status and influence apoptotic pathways Research has focused on its ability to inhibit tumor development particularly in prostate carcinoma models by affecting cellular proliferation and promoting apoptosis Se-Methylselenocysteine is utilized in studies investigating the prevention of neoplastic progression and disease recurrence with applications in oncology and selenium metabolism research