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Negative ion crescent pillow is designed according to ergonomics.  It can fit your curves of your head and neck perfectly. It can help cervical spine aline right to be therapeutic. It can also be protective to neck and shoulders. It can replenish negative ions that body needs in sleep and inhibit the consumption of vitamin C. It also can maintain beauty and keep young, improve sleep quality, enhance immunity, eliminate waste from body and change the problem of respiratory disease.