Secretory Immunoglobulin A is the primary immunoglobulin on most mucosal surfaces. SigA is a polypetide complex made up of two IgA monomers, a connecting J chain, and the secretory component. Located on mucosal surfaces, SigA provides protection by preventing invasion of pathogens. No reaction by IEP with antiserum to human Albumin, IgD, IgE, IgG, IgM and Lactoferrin. Prepared from colostrum shown to be non reactive for HbsAG, anti-HCV, anti-HBc, and negative for anti-HIV 1 & 2 by FDA approved tests. >95percent pure by SDS-PAGE.