What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 3 citation rows for the Coenzyme Q10 Ubiquinol + Warfarin pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Coenzyme Q10 Ubiquinol and Warfarin, a caution.

Q: Can I take Coenzyme Q10 Ubiquinol and Warfarin together?

Possibly, but with caution. Coenzyme Q10 Ubiquinol and Warfarin have a documented caution-tier interaction. CoQ10 is structurally similar to vitamin K2 (both are quinones) and may partially reduce warfarin's anticoagulant effect. Several case reports have documented decreased INR values in patients who began CoQ10 supplementation while on stable warfarin therapy. The effect is generally modest but clinically relevant.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

CoQ10 is structurally similar to vitamin K2 (both are quinones) and may partially reduce warfarin's anticoagulant effect. Several case reports have documented decreased INR values in patients who began CoQ10 supplementation while on stable warfarin therapy. The effect is generally modest but clinically relevant.

3 primary source citations. Moderate evidence. Last verified May 30, 2026.

Open the interaction checker →Read the methodology

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.

Sourcing standards·Evidence tiers

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: Coenzyme Q10 Ubiquinol and Warfarin
Pair type: Caution
Evidence (highest tier): Moderate
Source citations: 3 sources
Stack Score effect: −5 to your Stack Score (per scored caution row).
Scope: Supplement × Prescription
Last verified: May 30, 2026

Caution · Moderate evidence

Caution

What is happening. CoQ10 is structurally similar to vitamin K2 (both are quinones) and may partially reduce warfarin's anticoagulant effect. Several case reports have documented decreased INR values in patients who began CoQ10 supplementation while on stable warfarin therapy. The effect is generally modest but clinically relevant.

Mechanism. CoQ10 (ubiquinone) shares structural similarity with vitamin K and may have weak vitamin K-like activity, potentially promoting gamma-carboxylation of clotting factors. This can partially counteract warfarin's inhibition of vitamin K epoxide reductase.

Recommendation. If you need CoQ10 while on warfarin, start at a low dose and monitor INR closely for 2-3 weeks. Maintain a consistent daily dose to avoid INR fluctuations. Inform your prescriber about CoQ10 use.

Sources (3)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Coenzyme Q10 Ubiquinol 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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