Can You Take Vitamin E and Vitamin K1 Together?
Usually, at standard doses. Long-term high-dose vitamin E may interfere with vitamin K-dependent clotting.
The short answer
Vitamin E and vitamin K1 are usually compatible at ordinary doses, but long-term high-dose vitamin E may affect vitamin K-related clotting.
Why it happens
In a 12-week human trial, 1,000 IU per day of vitamin E increased PIVKA-II, a marker of poorer vitamin K status, although the clinical significance remains uncertain.
What to do
Spacing them by a few hours does not address this issue. Avoid unsupervised long-term high-dose vitamin E and keep vitamin K intake consistent.
What the evidence actually showed
The key study here is a 12-week human trial in which 1,000 IU per day of vitamin E increased PIVKA-II, a laboratory marker associated with poorer vitamin K status. This is a real, measured biological change, but the trial itself notes that the clinical significance remains uncertain — meaning it is not yet established how much this matters for actual bleeding risk or health outcomes in someone with otherwise normal clotting. It is also worth noting this used a high dose (1,000 IU) well above what many multivitamins provide.
When to ask a clinician
This combination deserves clinician input before use if you take warfarin or another anticoagulant or antiplatelet medicine, have any bleeding risk, or already have low vitamin K status, since the interaction described touches directly on clotting function. It is also worth remembering that the vitamin E dose that causes clinically important effects is not firmly established, so even without those specific risk factors, avoiding unsupervised long-term high-dose vitamin E is the more relevant precaution rather than trying to solve the issue through timing.
When this advice applies
Ask a clinician first if you take warfarin or other anticoagulant or antiplatelet medicines, have a bleeding risk, or have low vitamin K status. The vitamin E dose that causes clinically important effects is not firmly established.
Common questions
Can standard doses of vitamin E and vitamin K1 be taken together?
Usually, yes. At standard doses, vitamin E and vitamin K1 are usually compatible. The concern described in the evidence is specifically about long-term high-dose vitamin E, not about ordinary multivitamin-level amounts of either nutrient.
Will spacing vitamin E and K1 apart by a few hours prevent the clotting issue?
No. Spacing them by a few hours does not address this issue, because the concern is about a sustained high dose of vitamin E over time affecting vitamin K status, not about the two competing for absorption at the same meal. The more relevant step is avoiding unsupervised long-term high-dose vitamin E.
What did the human study on vitamin E and vitamin K actually find?
In a 12-week human trial, 1,000 IU per day of vitamin E increased PIVKA-II, a marker of poorer vitamin K status. The clinical significance of this finding remains uncertain, meaning it shows a measurable change but not necessarily a proven health harm at that dose.
References
- Vitamin E — Health Professional Fact SheetNIH Office of Dietary Supplements · 2026
- Vitamin E supplementation and vitamin K status in adults with normal coagulation statusAmerican Journal of Clinical Nutrition / PubMed · 2004
Updated July 31, 2026 · How to use this guidance