This invention is for formulations of analogs of the non-toxic and inert Vitamin D3, its non-toxic and mostly inert pre-hormone and its toxic and biologically active hormone, and for using these formulations for preventing and treating certain cancers such as breast, prostate, ovarian, kidney, renal and other cancers, Vitamin D deficiency, autoimmune disease such as Multiple Sclerosis, hypertension, osteoporosis, bone diseases, rickets, psoriasis and infectious diseases. This invention also discloses compositions of the analogs of the non-toxic and inert Vitamin D3 and the non-toxic and mostly inert Vitamin D3 pre-hormone.