RecruitingEarly Phase 1Drug trialVitD3 Supplementation in Patients With Multiple MyelomaThe goal of this clinical trial is to evaluate post-transplant immune reconstitution and lymphocyte recovery as well as the 3-year progression-free survival of patients with multiple myeloma in two treatment arms. One arm will receive Maintenance Vitamin D and the other arm will receive no maintenance Vitamin D prior to ASCT. Post ASCT arm 1 will have lenalidomide and maintenance VitD, and arm 2 will receive lenalidomide and no maintenance VitD. This clinical trial will also evaluate the overall response rate and survival for both treatment arms.