Colostrum contains over 90 immune factors, including the natural immunoglobulins IgG and IgA. Supplementing with freeze-dried bovine colostrum may help support immune system health. Sourced from USDA Grade A dairy cows. Lab tested to ensure it is free of antibiotics and rBST. Suggested article for further reading: https://pubmed.ncbi.nlm.nih.gov/23773360/"