That is a popular misconception. Halal is not any better or healthier. It is not organic. It is food blessed by an Imam with a  "zakat tax" paid on it. The money raised goes to mosques for Islamic education, and amounts to billions world wide.  Islamic education can be anything from teaching the Koran to children in Kabul,  or teaching jihadists in London about martyrdom.  It may be only $.0001 per kilo of halal chicken at the grocer, but there it is.