I've heard many times that the body can only absorb so much protein, carbs, etc. How might I be able to expand my body's ability to absorb what I put into it?

If I have some of these at my house (ordered them a while back), should I take them?

http://www.naturessunshine.com/us/pr...?stocknum=1836

Based on what I know about enzymes, it seems they would help. But I'm not sure.