here is some info I found

Unlike most salts, this ancient salt is not processed with harsh chemicals. Instead, it is mined by hand and stone ground. Himalayan salt has no preservatives or additives.
Doctors and alternative therapists agree that Himalayan salt is the cleanest salt available on the planet to deliver remarkable health benefits. Himalayan crystal salt is pristine and natural. It consists of the most perfect geometric structure possible in rock crystals, the result of millions of years of compression under the Earth’s surface. Its has precise mesh with our body's inner workings because Himalayan crystal salt contains an almost identical set of elements to those found inside the human body: that is, 84 of the possible 92 trace minerals, in the same proportion as naturally exists in our blood.

Himalayan crystal salt can be consumed as mineral water by dissolving in spring or energised water, dissolved in a hot bath for a healthy soak, or blended with essential oils for a rich body scrub, you can even put it on your food. All of these things help to maintain the bodies natural balance.

http://www.somethingforthewickend.co.uk/himalayan_salt.html

Hope this helps,
Love,
Ami Joi Benton
Curezone Team Member