ImmunoG PRPâ¢ Chewables is a natural bovine colostrum formula. This formula is a whole food producing IgG and colostrum polypeptides. It also delivers protein, immune factors, growth factors, vitamins and minerals to protect health and vitality naturally. Scientific studies have shown that colostrum aids the human immune and cytokine systems. This formula is carefully processed for maximum biological activity and is antibiotic-free.