The slight variations in extracting procedure cause many of the amygdalin (Vitamin B-17, Laetrile) molecules to change to a form unknown to nature(:) isomers...There are ...purveyors who label their 'iso-amygdalin' products 'amygdalin' contrary to all of the recognized specs...For commercial or political purposes, they certainly cannot justify such a fallacy...This scientific heresy and commercial fraud...(is) tremendously reducing the effectiveness of amygdalin therapy. ...To mislabel iso-amygdalin as amygdalin is scientifically, medically, and morally indefensible.