Our skin is our largest organ and it while it is a barrier for our bodies, it is also permeable, meaning things go OUT (sweat) AND IN (absorbs) through it.
Wonderful if you can go without deodorant, but we all have times you may desperately need it. So for the times you need a little more “fresh”, be sure to make sure you had a safe, non-toxic one so your skin is not absorbing those bad chemicals. I like Tom’s of Maine, but there are several from which to choose. Check out http://www.ewg.org/skindeep to see the best ones and/or how your current one rates.