A friend of mine posted me a link to the pink patch asking what I thought, as she was considering trying it. I looked up the ingredients and, as bimbo says, it's all stuff available from a health food shop. My response was pretty much the same as Ethel's, if it works then the NHS would prescribe it to you.
The pink patch claims to stop your cravings etc, personally, I see it as a placebo and you're cheaper buying elasto-plast and telling yourself it has the same 'properties' as the pink patch, that will create the same effect.