(Taken from: http://cancertutor.com/Cancer/Noni.html)
How It Works
Like grape juice, Noni juice contains a whole slew of cancer fighting nutrients. It kills cancer cells (the anthraquinone damnacanthal and the trace element selenium), it stops the spread of cancer (beta sitosterol, noni-ppt and limonene), it stimulates the white blood cells and other parts of the immunity system (polysaccharides) and takes part in a process that enlarges cell membranes so they can better absorb nutrients (proxeronine aids in creating xeronine). And this is only a partial list!