I'm looking for herbal remedy for atopic dermatitis without side effects?

Doesn't exist. Many people believe that "herbal" means "safe" and "no side effects", and manufacturers encourage that myth. But many substances, such as poison ivy, are "herbal", and you don't want them anywhere near their skin. Furthermore, the product with no possible side effects, herbal or not, does not exist. Don't waste your money on "no side effect" remedies; they don't work, and do have side effects.