Puhdas+ Magnesium Gel is a strong magnesium product for external use. Use the gel for magnesium deficiencies, eg. muscle cramps, growth pains, cramps and restless legs. Usage Apply on your skin. Magnesium is best absorbed when applied on thin areas of the skin, such as bend of the arm, or directly into the problem area. At the beginning of the use, magnesium can cause mild tingling and slight redness on sensitive skin, which usually stops when continuing use. Avoid contact with eyes and mucosa. 1 ml of magnesium gel contains 103 mg pure magnesium.