Hey starfish,
I have no idea about infused oils, but I did make a deodorant from essential oils, and it is pretty effective. When I want to be extra Sure ™, I put 2-3 drops of lavender oil directly on my skin. It kills bacteria and is aromatic, and it actually makes a good skin conditioner so I figure as long as I’m not shaving and nicking my skin, it won’t do any harm.
I combined 15 drops of bulgarian lavender, 10 drops of tea tree, 1/2 oz of rubbing alcohol, and 1/2 oz of water in a pump-action spray bottle.
Next time I’ll use less water. It doesn’t evaporate like alcohol…just runs down the side of my ribcage, probably taking the oil with it, away from my armpit. Bleh.
A fairly un-shady sales rep told me that whenever I mix essential oils with water, after time they will spoil, and that a cheap rubbing alcohol (or I dunno, even an expensive one) will preserve the concoction if it’s going to be sitting around for more than a few days.