Everything being a matter of perspective here... parasites do absorb metals but in your body, not all parasites are beneficial, they can cause quite a few problems even without the presence of heavy metals, first off by absorbing good nutients as well as poisons... given heavy metals to contend with also, they do absorb some of that but then when you go to get rid of the original parasite problem you'll undoubtedly be hit with a triple whammy dose of heavy metals you should have gotten rid of long ago except for the fact that the parasites were holding onto it and actually were helping keep the junk in your system instead of vice versa.

Of course if the parasites only stayed a day, ate up all the bad metals in your stomach, bypassed the good nutrients, and then exited via your bm that would be another thing altogether but it doesn't really work that way unfortunately.