Is Chaga (Inonotus obliquus) Safe with Warfarin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Do not take Chaga supplements with warfarin without medical supervision. Seek immediate care if you notice prolonged bleeding, blood in urine or stool, or unusual bruising.
Why this interaction occurs
Chaga mushroom contains oxalates and natural compounds with anticoagulant properties. It may potentiate warfarin's blood-thinning effect through additive mechanisms, significantly increasing hemorrhage risk. High oxalate content also poses additional metabolic concerns.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 134,328 reports mentioning Warfarin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Warfarin + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Chaga (Inonotus obliquus) interactions → · All Warfarin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.