Probably is more of a placebo than anything else, but I've been wearing one for over a year and I swear my wrist hasn't ached since the day I put it on.
Yeah, sorry, suppose I should have elaborated! I broke my wrist about 6/7 years ago, and when I get cold, or I overwork it (say, at work) it aches, it's 'orrible.
I use Tommie Copper wrist bands which are stretchy thin material infused with copper. They WORK without a doubt. If the bracelet you have contains copper, I think it should help!