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.