Sustained Release. 20% Immunoglobulins. KAL® Colostrum 1000 mg is sourced from 100% pure New Zealand colostrum. The colostrum is obtained from the cow within 48 hours of calving and processed in New Zealand under a fully implemented HACCP (Hazard Analysis Critical Control Point) program. BSE (Bovine Spongiform Encephalopathy) is not known to exist in New Zealand. Each tablet features 20% Immunoglobulins which includes all four of the key immunoglobulins: IgG IgM IgA and secretary IgA. This concentration of nutrients enhanced with Beta Glucan is intended to provide nutritive support for general health and well-being. Sustained release technology allows the body to absorb what it needs for optimal nutrient support.