I think there AMAZING. I did a modality of things and colonics has helped me with constipation, feeling better, eczema.
My therapist is intuitive and private. When I felt nauseous (which happens) it usually lasts not more than 5 minutes... it is because a release of some sort is coming (she massages my tummy to help faciliate this) and I feel MUCH MUCH better afterwards and I am heartened when I see TONS of stuff leave.
I am a petite woman and in good shape and eat very well BUT still stuff comes out of me (could be from the years before I ate unhealthy). Even after a long juice fast I was amazed at see this old fecal matter leaving.
Always trust your own intution and try it yourself and then you can decide for yourself if you think its a good idea
. I took 3 times for me to really have a release when i first started.