Anony Mous,
My experiences have been similar.
Whatever the pseudo-science the GB / FDS / WTS or (whatever it is they preferred to be called) may quote about blood therapy, no doctor that I have ever dealt with has had any doubts about it.
When my children were still young, and I was still "in", the matter of blood alternatives was raised on several different occassions. Each time, the answer was pretty much the same:
i.e. The so-called "hazards" of blood therapy much exaggerated, and the effectiveness of blood alteratives very much exaggerated. As one doctor expressed it "You people scare me!"
Bill.