couple of responses wayaza. i'm sure your Doctor means well, but he doesn't know what he's talking about.
whey protein is an incredible protein source, containing large amounts of amino acids, both essential and branched. hair, like the rest of the body, is built on amino acids, particularly cysteine. therefore, whey protein supplements are fantastic for hair!
also laser treatment does not cause cancer. however IF (and this is a big IF) you already had brain cancer, laser therapy would grow the cancer cells, because laser therapy grows all the cells it comes into contact with...hence why its an amazing hair follicle regenerator.