Are there any risks in using cranberry supplements?

Because it is a supplement, cranberry is not screened for safety by the Food and Drug Administration (FDA). There may be a risk of increased kidney stones when using cranberry. Pregnant and nursing women should consult their health care providers with any questions about possible risks. People taking cranberry supplements may experience allergy symptoms such as trouble breathing, chest tightness or pain, itchy skin, hives, swelling, and rash. Get immediate medical attention for any allergic reaction.