Universal Animal Pak Daily Defense Immunity 101: is the “Ultimate Immune Pack” to cover the backs of anyone looking to boost their immune system. With Animal Immune Pak, you get plenty of everything you need. And a few extras. In every pack, you get a potent dose of vitamin C and vitamin D, plus the immune-support minerals calcium, phosphorus and zinc. Add to that the right amounts of natural immune support plant and herb ingredients and you get a Complete Immune Support Complex designed to boost your body’s first line of defense.