i find all halogens fascinating, I'm glad to see this...and I'm impressed with the fact that Andreas endorses it's use.
the only halogen which seems to be completely and totally useless(in fact, harmful) is fluoride. Other than that, the others are all utilized by the body in some way, ways that we are just beginning to understand.
and I'll bet that the fact that chlorine can have negative effects on the body has more to do with chlorinated water than anything else...