Blessed thistle may increase stomach acid and can reduce the effectiveness of antacids (e.g., calcium carbonate), H2-blockers (e.g., ranitidine), or proton pump inhibitors (e.g., omeprazole).
You should avoid using blessed thistle if you have intestinal problemssuch as Crohn's disease, as it can irritate the stomach and the gut.
Do not use blessed thistle during pregnancy.
There is not enough evidence to suggest blessed thistle is safe for breast-feeding women.
You should avoid using blessed thistle if you have an allergy or hypersensitivityhypersensitivityan exaggerated response to a substance or agent to it or to any ingredient of the formulation. You should also avoid using blessed thistle if you are allergic to members of the plant family Asteraceae/Compositae (such as ragweed, chrysanthemums [mums], marigolds, and daisies).
Before taking any new medications, including natural health products, speak to your physician, pharmacist, or other health care provider. Tell your health care provider about any natural health products you may be taking.