Colostrum. Taking a daily Colostrum supplement can help your immune system stay at its normal levels to fight off infection and disease. Colostrum is known to be used to support your immune system and for athletic performance. Colostrum has high levels of protein, fat-soluble vitamins, minerals and antibodies called immunoglobulins. Colostrum is usually replaced by transitional milk between two to four days after birth. Bovine colostrum is also used for boosting the immune system, healing injuries, repairing nervous system damage, improving mood and sense of well being, slowing and reversing aging, and as an agent for killing bacteria and fungus.