What is a potential risk of using garlic as a supplement?

Using garlic as a supplement can indeed present a potential risk of increased bleeding. This is primarily due to garlic's natural anticoagulant properties, which can inhibit platelet aggregation and prolong bleeding time. Patients who are on anticoagulant therapy, such as warfarin, or those with bleeding disorders should be particularly cautious when considering garlic supplements, as the additive effects could increase the risk of bleeding.

The other options present different concerns but do not relate directly to a common risk associated with garlic supplementation. For instance, garlic is generally recognized for its potential benefits, such as supporting cardiovascular health and possibly contributing to weight loss, rather than causing high blood pressure or severe allergic reactions in most individuals. Understanding the anticoagulant effects of garlic allows healthcare providers to effectively counsel patients about its use, especially in the context of surgical procedures or concurrent medications that affect clotting.