I actually didn't know Lact-aid made a supplement until I looked it up just now... I thought they just made the milk, etc that was safe for lactose-intolerant people. If dairy was your only "problem food", those pills and the lact-aid pills should work about the same, because they both have lactase in them.
I have issues with so many foods and apparently my body doesn't make its own enzymes like it should >.< so I take the broad-spectrum enzyme pills I linked to.