I dont care for Pina Colonics, I perfer Marguritas really...
oh... wait......... YUCK!
Seriously, it isnt anything to worry about. The area being flushed out is an area that is only holding waste products. Anything in the flushed area are products the body has completly finished with. Vitamins and food are utilized in the either the upper of lower GI, or in some cases absorbed throught the stomach lining.
It isnt actually flushing out the kidneys or liver or anything, only the colon, and unless you get a high colonic, it is still missing a lot of the waste products.
I personally have seen conflicting research backing up and disproving the health affects of colon hydrotherapy.
It undoubtedly flushes out the "debris" being held in the colon, but the idea of it flushing out toxins is debatable.
What we are asked to believe is that the colon being full of waste (and toxins) is causing the kidneys and liver to "back up" with waste, and that flushing the colon clear gives the kidneys and liver the opprotunity to dump their toxins into the newly cleared out colon.
On so many levels this is not backed up by basic science.
I believe there are some benefits to colonics, but I think they are being way over hyped...