Bonnie, the energy from the north pole of a magnet is not the same as
from the south pole.  Refrigerator magnets and I suppose sign magnets
don't have the poles separated, north on one side, south on the other,
like magnets used for healing.  I have several books on biomagnets and
the authors all agree that the use of the south pole energy is dangerous
in the hands of non-professionals.  All of them recommend use of the
north, or negative,  pole only.

Basically, negative magnetic energy normalizes and calms.  It normalizes
acid/base balance (alkalinizes), increases cellular oxygen, fights
infection, supports biological healing, reduces inflammation,
relieves/stops pain, increases cellular oxygen.  There is agreement
between authors that the negative pole is safe, although  Washnis
cautions that prolonged use after initial success can cause reduced
adrenal production and therefore recommends that maintenance use be
limited to 30-60 minutes  a day.

Positive energy decreases cellular oxygen, increases intracellular
edema, stimulates wakefulness, accelerates microorganism growth
(increases infection), inhibits biological healing, can increase
inflammation, increases body acidity, increases pain.  It stimulates
cell growth, not what you want if you have cancer.
Magnetic strength is measured in gauss. Healing magnets are not
effective below l00-300 gauss up to a max of 3500-4500 gauss.

The above is merely an overview and by no means complete as far as
effect of magnetic energy on the body.  The important thing is to be
sure to use only negative (north pole) energy.

Three difinitive authors are William H. Philpott (_Biomagnetic
Handbook_), Albert Davis and Walter Rawls (_Magnetism and Its Effects on
the Living System_) and George Washnis (_Discovery of Magnetic Health_).
There is a book titled _The Body Electric_ that tells you a lot more
than you want to know if you are only interested in the healing aspects
of biomagnetics.

The point I am making is that magnetic energy like electricity can be
beneficial or dangerous.  It would be best to read a good book first,
and then buy a magnet from a reputable company so that you know which
pole you are using.  If the poles aren't color coded or marked, hang the
magnet by a string.  The side that turns toward the north will be the
south pole, usually colored in red.  Don't use this side against your
body.    

Sorry this turned out so long.  John


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