I was hit be a car about 10 years ago.
ive lived with mild stabbing neck pain to some degree on a daily basis which is agrevated by working with computers and never really gotten better.
my friend brought me the necklace from overseas. i didnt want to tell her i though it was a waste of money. but i put it on and with in seconds my stabbing neck pain was gone. Seconds.
Dont know about the science. dont know about the tests. but i do know it worked for me. i havent had pain for the past 2 weeks. ( the longest ive been without someform of neck pain is 2 days) and that was a one of 1.5 years ago. )
i have heard there are cheep knockoffs that only look like the phiten brand. as with anything in life you get what you pay for. so if your going to buy make sure your seller is reputable. well thats my 3 cents.
i highly recommend phiten. ifs its a placebo then its the best placebo on the planet. results count.