Seocalcitol (EB 1089) is a synthetic vitamin D₃ analogue and potent vitamin D receptor (VDR) agonist. This specialty chemical is used in research for its antiproliferative, differentiating, and apoptosis-inducing effects on cancer cells, particularly in prostate cancer, breast cancer, and other malignancies. It modulates cell proliferation and differentiation to inhibit tumor growth. Seocalcitol has also been investigated in preclinical studies for psoriasis by regulating keratinocyte growth and differentiation. For laboratory research use only; not intended for clinical or therapeutic applications in humans.