Quick help for cramps. A skin spray for daily use, which is the most effective way to restore the body's magnesium level, because it is easily absorbed into the skin and the underlying tissues. How to use: Spray in the palm of your hand or directly on the skin and massage gently. If you are bothered by the salt left on your skin, take a shower 20 minutes after using the Magnesium Concentrate, as most of the magnesium ions are absorbed after 20 minutes. You can also use it in combination with Magnesium Bath Salt. As a general rule, approx. 6-8 mg per kg of body weight is recommended. For a 90 kg man approx. The daily requirement is 600-800 mg (e.g.: 6 x 90 = 540 mg). with 8 blows approx. 100 mg of pure magnesium is absorbed through the skin.