I hope everyone will take a look at this repost and see if you can put together the reason why some people are affected negatively by magnets.
I have used magnets on and off for years. In the beginning I could not understand why people said that sleeping on magnets benefited them. I got worse after a while of use. I did finally learn why that was the case. I can now use magnets without problem and I am a negative A, non-secretor.