I get adjustments on by back and neck and if I don't have this pillow I get terrible headaches. I will not sleep without it. It truly works I swear by it been using it for 3 years now,bought it from my chiropracticor when I moved I didn't have it for 4months and had a headache every day until I found out this web site to order it myself no headaches since I received it. they are also very prompt on getting it shipped to you had it within 2 or 3 days. thanks again core !!!