The outer layer of skin is a barrier of dead, protein-rich cells and fats that keep moisture in and irritants out. When the barrier breaks, the skin becomes dry, inflamed and sensitive.
In one study, 13 women took a daily oral flaxseed supplement or a safflower oil placebo. After 12 weeks, compared to placebo, women in the flaxseed group had skin that was less sensitive to irritation, smoother and more hydrated.