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Feverfew is known to have properties that can inhibit platelet aggregation, which can lead to an increased risk of bleeding when taken alongside anticoagulant medications. This risk is particularly significant for individuals who are already at risk for prolonged bleeding time due to their anticoagulant therapy. The active components in feverfew affect blood clotting mechanisms, making it crucial for practitioners to advise against its use in conjunction with anticoagulants.

While ginseng can also interact with anticoagulants, evidenced by its potential to enhance their effects, it does not have the same level of established interaction as feverfew. Glucocorticoids primarily work as anti-inflammatory medications that may affect the immune system but do not directly cause increased bleeding risks in the same way as feverfew. Proton pump inhibitors, on the other hand, are used to reduce stomach acid and do not have a direct impact on coagulation or bleeding risk. Thus, feverfew stands out as the supplement that poses a significant risk when used with anticoagulants, making it critical to inform patients about this potential interaction.