I dont know about oxide specifically but people soak in Magnesium Sulfate in the bathtub all the time. It is absorbed but to what degree I do not know. There

I dont know about oxide specifically but people soak in Magnesium Sulfate in the bathtub all the time. It is absorbed but to what degree I do not know. There are known risks and warnings issued for using bath salts. [1] I assume perhaps incorrectly that there could be similar/related risks. Perhaps some biologists would be kind enough to chime in. [1] - https://www.medicalnewstoday.com/articles/epsom-salt https://www.medicalnewstoday.com/articles/epsom-salt