Epsom salts are a very popular type of bath salt, although they aren't technically a salt at all. The salt-like crystals are made up of naturally occurring magnesium sulfate. They're named after a saline spring in Epsom, England.
People have long used Epsom salts for all kinds of applications: beauty, health, household, and gardening. Their special power as a bath salt is the easy absorption of magnesium sulfate into your skin.
Magnesium is important for many functions in your body, including muscle and nerve function and the production of melatonin, the sleep hormone. However, it's not easily absorbed as an internal supplement and can cause stomach upset.
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