NutriStack
Bee Pollen and Warfarin, a caution.
Bee pollen has case-report evidence of potentiating warfarin. A stable warfarin patient developed an INR of 7.1 about one month after starting honeybee-collected pollen, with no other identified medication, diet, illness, alcohol, or adherence explanation. The mechanism is uncertain, and product composition varies by pollen source, so the main concern is unpredictable over-anticoagulation when bee pollen is started, stopped, or changed.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Bee Pollen and Warfarin
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Bee pollen has case-report evidence of potentiating warfarin. A stable warfarin patient developed an INR of 7.1 about one month after starting honeybee-collected pollen, with no other identified medication, diet, illness, alcohol, or adherence explanation. The mechanism is uncertain, and product composition varies by pollen source, so the main concern is unpredictable over-anticoagulation when bee pollen is started, stopped, or changed.
Mechanism. The mechanism has not been established. The published case is consistent with a pharmacodynamic or pharmacokinetic increase in warfarin effect after bee pollen exposure, but bee pollen is chemically variable and specific active constituents were not identified.
Recommendation. Avoid bee pollen while taking warfarin unless your anticoagulation clinician approves it. If bee pollen is started or stopped, arrange extra INR monitoring within 1-2 weeks and watch for bruising, nosebleeds, gum bleeding, blood in urine or stool, severe headache, dizziness, or weakness.
Sources (2)
Stack Score
How this pair moves the number.
Effect on the composite score
If both Bee Pollen and Warfarin are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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