Bovine thymus polypeptide fractions/bovine spleen extract in immune supplements?

I have been sick with an upper respiratory infection and a friend who is into holistic treatments suggested I start taking something called ThymuPlex Immune Booster by Enzymatic. Mostly, it contains lots of Vitamin A, C, E, zinc and selenium, but it also says it contains "bovine thymus polypeptide... show more I have been sick with an upper respiratory infection and a friend who is into holistic treatments suggested I start taking something called ThymuPlex Immune Booster by Enzymatic. Mostly, it contains lots of Vitamin A, C, E, zinc and selenium, but it also says it contains "bovine thymus polypeptide fractions/glandular complex, bovine spleen extract, and bovine lymphatic extract." What's up with the bovine stuff? How would this stuff help me? Or am I wasting my money taking this?
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