Benefit of negative ions

I've posted about sanitary napkins which contain negative ions, and it has given me benefit, such as no cramps or pain during my period.
One of other benefits is how negative ions benefit in treating cancer.

I did some research in Internet and find these information about other benefits:

http://www.peakpureair.com/negative_ions.htm

http://www.comtech-pcs.com/whatareions.html

http://healthmad.com/health/health-benefits-of-negative-ions/

http://www.detoxion.com/Negative%20Ions.htm

http://www.negativeiongenerators.com/negativeions.html

http://www.soyouwanna.com/information-negative-ions-2117.html