Which statement describes a potential interaction of Achillea millefolium (Yarrow)?

• A. Yarrow may interact with anticoagulant medications, increasing bleeding risk
• B. Yarrow significantly raises blood glucose in all patients
• C. Yarrow reliably cures infections without side effects
• D. Yarrow has no interactions with other herbs

Answer: (A)

The key idea is that herbs can interact with medicines that affect blood clotting. Achillea millefolium can influence coagulation, and while it’s popular topically to stop minor bleeding, internal use may modestly affect platelets or coagulation pathways. Because of this, taking Yarrow with anticoagulant or antiplatelet drugs (like warfarin, heparin, or aspirin) can raise the risk of bleeding, especially around surgery or in people with bleeding disorders. That’s why the statement about potential interaction causing increased bleeding risk is the best choice. The other claims aren’t supported: Yarrow does not universally raise blood glucose in all patients, it isn’t a guaranteed cure for infections, and it can have interactions with other herbs or drugs, so saying there are no interactions isn’t accurate.