Phiten products

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Anyone out there use the "PHITEN" products? My daughter came home with a necklace that belongs to a friend. I am wondering if anyone has any personal experience with them. This necklace looks like a cord. Not like a metal necklace. I have a lot of back and neck pain, which the information I have googled talks about, but it mentions Titanium I believe. I don't see any metal on this necklace. Just wondered what it was all about.