I am a PhD biostatistician and I have spent lifetime doing research on establishing whether a given treatment (e.g. a drug, or Phiten bracelet etc.) has a statistically significant effect on treatment recipients. There are well established scientific procedures to perform such verification. It would be relatively very simple and inexpensive perform statistical test of Phiten efficacy – such as a double blind clinical trial. The fact that the manufacturer did not perform such test and did not publish corresponding results in peer reviewed scientific literature means that the claims must be taken with a large grain of doubt.
After having said that, I must admit that I have been wearing many Phiten products almost every day for more than fifteen years, including compression socks, knee braces, shirts, underwear etc. because I have advanced degenerative arthritis in all of my body. Does it help? Who cares when I am in constant pain and did NOT find anything better (I have tried hundreds of other products). And I wear a Phiten necklace because it looks cool.
I have also a bad news. I regularly travel to US and Japan to purchase Phiten products. Unfortunately it appears that Phiten in both countries drifts towards bankruptcy.