RESUMEN
BACKGROUND: Moisturizer is an important component of many cosmetic products. It helps to maintain the skin's integrity and its barrier functions. Recently, magnetic masks that seek to improve the properties of the skin have been developed and have become a new cosmetic trend. However, scientific proof of their stated properties is lacking. AIMS: To test whether iron oxide contained in a face mask with magnetic properties in an oily matrix with a freeze-dried aloe-vera base increases moisturization of the skin and improves skin barrier function. METHODS: Formulations were prepared containing an oil phase (67.3% wt.) and a solid phase (32.7% wt.). The moisturizing properties of the mask were tested by measuring in vivo electrochemical impedance spectroscopy, contact angle, and visual appearance. Meanwhile, human panel tests were performed to evaluate the sensory perception of potential users. RESULTS: The moisturizing effect of the iron oxide mask is clearly superior to that of the other tested samples. Water retention and low transepidermal water loss (TEWL) were evidenced for the iron oxide magnetic mask. Its occlusive action on the skin resulted in larger water contact angles and enhances the barrier effect. A favorable sensory perception on the part of the users was obtained for the iron oxide magnetic mask. CONCLUSION: The presence of iron oxide and the magnetic property of the mask enhance occlusive behavior, diminishing the TEWL. Sensory analysis of the iron oxide magnetic mask performed by human panel tests shows that they possess characteristics including neutral odor, and easy, pleasant-feeling application.