Have any supplements been studied for dermatitis?

Supplements that have shown potential benefits for treating eczema are oral Vitamin E, topical Vitamin B12,^[1] Vitamin D,^[2] and probiotics.^[3]. One study found that whey protein reduced symptoms of contact dermatitis^[4]. Additionally, people who are deficient in certain minerals and nutrients — Vitamin B2, Vitamin B3, Vitamin B12, zinc, iron — often present with dermatitis-like symptoms.^[5] In this case, supplementation of the deficient nutrient is advised.