The present invention relates to a method for prevention and/or treatment of an autoimmune disease, comprising administering a composition, said composition comprising at least one beta cell autoantigen, to a subject The subject may have a serum vitamin-D level above 50 nanomole/liter or the composition may be administered by intralymphatic injection or injection directly into a lymph node, or over a period of weeks, months, or years. The invention also relates to a composition comprising a plurality of particles, each having immobilised on its surface at least one first and at least one second antigen, wherein the first antigen is a beta cell autoantigen, and the second antigen is either a tolerogen or a beta cell autoantigen, andto composition comprising i) at least one beta cell autoantigen, and at least one of iia) an IL-10 inducing compound selected from the group consisting of vitamin-D, vitamin-D analogs, tyrosine kinase inhibitors, gamma-amino butyric acid, and gamma-amino butyric acid analogs; and iib) a compound that reduces the dendritic cells' ability to activate na ve CD4+ Tcells, such as a cyclooxygenase inhibitor, a CTLA-4 compound or a TNF alpha inhibitor. The invention also relates to pharmaceutical kits and to medical use of beta cell autoantigens.