One of the most authoritative scientific studies comes from a Christian organisation. Just last year Leanne Roberts [DDO], from the Southwark diocesan office, published a scholarly assessment of the power of prayer. Together with colleagues, she evaluated a number of research trials which involved nearly 8,000 patients. There was no difference overall in recovery from illness or death, whether subjects were prayed for or not.
Readers may like to read thePrayers for the sickin the Book of Common Prayer and I would encourage them to be prayed with faith.