Aiyoo... Already proven to be purely psychological. There's no real proven benefit to these.
Go see Mythbusters
Scuba & Father... For Life
nauseous wives are a good photo op!
You can try other brands from Japan like Phiten or Colantotte - Marina Square and Takashimaya, or any large golf shops. They don't come cheap for the minimal physical improvement they provide, but hey, if the wife says she needs it...
Nikonian since 2003
F55 | D700
personally im using Phiten necklace.
dont know if its placebo effect, but i really feel better upon wearing it.