Can I take birch if I am pregnant or breastfeeding?

Birch is not recommended in pregnant or breastfeeding women due to a lack of scientific evidence. Maternal pollen allergy seems to have a stronger influence on the development of rhinoconjunctivitis (inflammation of the lining of the nose and the mucous membrane that covers the front of the eye and lines the eyelids) in children with a family history of atopy than the degree of allergen exposure during pregnancy.