Animal Pak is an overprice multivitamin. Most of the pills are just Amino Acids, Siberian Ginseng (which isn't ginseng at all), and liver tabs. If it does contain something that a regular multi doesn't have, its usually underdosed.
Just buy a regular store brand multi. Personally i like GNC Mega Mens, It's around the same price as a regular multi, but is time released, and actually seems to be time released as neon pee lasts for more than just one piss. As opposed to most multi's which give one neon yellow piss and its back to normal.