Hi Angela,
the skin absorbs better than the intestines and send the nutrients right into the cells, therefore I also encourage people to take transdermally all that is suitable.
I also use trans-dermal magnesium as deodorant (in armpits). But make sure you have no cuts on the skin as it stings a lot! First apply some magnesium on the forearm skin to test. If it is too concentrated, add some water and test again.
This way one can avoid a lot of toxins which come with the deodorants, perfumes, even shower gel.
I use once per week a bath with sea salt and sodium bicarbonate (150 g each) and I would lay in this bath for at least 20 minutes. I even wash my hair with it. No soap, no shampoo, no shower gel is needed. After 20 minutes I would rub vigorously my skin with a sponge, to get rid of the old skin cells. You'll be amazed how the water surface will look like!
After that I would rinse my hair with water with some apple cider vinegar added, and apply some natural cream on my skin. And I have no skin problems, perspiration is odorless, my hair grew stronger.
Try it, I hope you'll be satisfied.
Joy