If you want to treat dry skin from inside your body...
Consider taking supplements to get some nutrients you need.
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Gamma-linolenic Acids
Gamma-linolenic acids, or GLAs, are essential fatty acids that help the body produce prostaglandins--hormone-like substances that support numerous body functions. According to the Linus Pauling Institute at Oregon State Uniersity, , GLAs are good nutrients for supple skin. GLAs can be reaped from evening primrose oil, borage oil and black currant oil.
Fish Oil
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Fish oil contains omega-3 fatty acids that is known as healthy fatty acids to reduce inflammation. You can get enough fish oil by eating seafood like salmon, albacore tuna, or sardines. But if you don't eat fish think about taking supplements.
Vitamin A
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Vitamin A can help and protect skin tissues. If you don't take enough Vitamin A you will have a sign of dry and rough skin.
However overdose of Vitamin A will show the same signs.
However overdose of Vitamin A will show the same signs.
Beta-carotene
You can get Beta-carotene from vegetables like carrots. You can get it from dietary supplements, too.