There seem to be a lot of commercials and advertisements for nutrition additives. Especially vitamines, minerals and glucosamine appear really popular lately, as the magazines I get are full of it. I wonder if these things really help, or if they just have the 'placebo-effect.' I guess the psychological effect may be big as people who take them will certainly believe in them. If besides that there is also a physical effect, then of course it's a good thing.