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A mxu roller is a handheld roller-device covered in microneedles which is rolled over the skin. This is done in order to create tiny punctures on the skin which triggers skin repair, leading to the creation of new collagen. A bodily protein made up of amino-acids, collagen is the part of the connective tissue that helps in firmness, strength, suppleness, and elasticity in skin.
Therefore, the short-term wounding of the skin is intended to trigger the production of a protein that will actually in turn strengthen the skin to a healthier level than before.