There is a natural products company called "fruit of the earth", and they make an all natural Vitamin E lotion. I use a very small amount on my chins from time to time. The room they are in has an air conditioning unit that is equipped with a dehumidifier. So the air can get quite dry for them sometimes. Their ears and feet start to get dry and itchy. Just a very small dab, about half the size of a pea is enough to keep their skin hydrated for a week, and it is perfectly safe for them, in small amounts. I have also found that if I rub a bit between my thumb and forefinger and then rub their ears the same way, with my fingers on either side, they really like it, and it helps spread rub the lotion into the skin very well.
I found this product in a health food store, but I think I have also seen it in the body lotion section at wal-mart. I took it to my vet and had her check it for dangerous chemical components, and she found it to be harmless.
You can also try adding a drop of vitamin E oil, at a dose of 10IU (about one drop) per 500 grams of weight. I added this to their pellets originally, but honestly did not see a huge difference. However, I did not try it for very long. I hope this helps!