All water is ground source and then run through pipes if it's tap.
The debate about absorbtion is always on, and it varies from one person to the other. The quality of a vitamin matters too. I take an awsome multi that covers all my bases. I still take calcium separate (too bulky to fit what I need in a multi) and vit E and chromium and vit C. But as for everything else, I feel it's supplied by my day to day multi and diet (and water consumption) I realize that the ground has been so worked over that it doesn't have nearly what God intended left in it anymore....but I vary the veggies and such, using my multi as a "safety net" for what I miss.
I'm not saying you shouldn't take colloidals, but was rather just asking. I work at a vit store and have nutrition degree. I see a lot of people come in and put $ into unescesary (sp) products because they were misinformed or whatever.
As for most BBing supps talked about here, I'm unaware of their functions and all......so I learn from you guys every day. We all have our places of knowledge. AND we all have our routines that work for us regardless of other's opinions! So, I think it's nice to be able to discuss something genuinely.