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Taking warfarin? How to check any supplement first
Supplements and warfarin do not always mix, because some vitamins and herbs change how thin the blood runs. Tell your clinic before you start any capsule, so they can plan an INR test. The Reviralis Complete label prints vitamin E at 27 mg, no vitamin K line, and a 661 mg blend whose amounts are hidden.
Written by the Goreviralis label deskUpdated · 5 min read
The basics01
Why can a supplement change how warfarin works?
Warfarin is dosed to a narrow target, so a small push from a vitamin or herb can move the result.
Picture a man who has taken the same warfarin dose for two years. His INR, the blood test that shows how long clotting takes, stays in range. Then he adds a capsule from the drugstore shelf. Nothing on the box says warfarin. Three weeks later the clinic finds his number has drifted.
That is why clinics ask about every vitamin, tea and herb. The reasons fall into three groups.
- Vitamin K helps the blood clot. Warfarin works against it, so a steady amount matters more than a low one.
- Some nutrients and plants thin the blood a little on their own and add to the drug.
- Some herbs change how the liver clears the drug, so the dose behaves differently.
The Reviralis Complete label tells anyone on blood thinners to consult a healthcare provider before use. It does not say how the capsule affects warfarin, and no source we cite tested the product itself.
On the label02
Which Reviralis label lines should you show your clinic?
Show the whole Supplement Facts panel, but four lines deserve a pointed finger.
Bring the bottle or a photo of the panel. The first thing to note is what is missing: the 22 vitamin and mineral lines include no vitamin K, so the label gives no vitamin K amount to count against your diet. The blend is another matter. It is 661 mg shared by 18 names, and no single amount is printed. Under the label-order rule (21 CFR 101.36), each name can hold at most 661 mg divided by its place in the list.
| Label line | Printed amount | Why a clinic cares |
|---|---|---|
| Vitamin E (dl form) | 27 mg | High doses may add to bleeding risk with anticoagulants |
| Bilberry fruit extract | Not printed (at most 82.62 mg) | May add to blood thinners (MSK About Herbs, Bilberry Fruit) |
| DHA | Not printed (at most 41.31 mg) | High-dose omega-3 may prolong bleeding |
| Licorice root extract | Not printed (at most 47.21 mg) | Interacts with several medicines |
The ceilings are label arithmetic, not a claim about the capsule. The real amounts may be lower.
Doses in context03
Is 27 mg of vitamin E a lot for someone on a blood thinner?
It sits above the 15 mg daily need but far below the 1,000 mg upper limit, so the amount alone is not the worry.
NIH lists an RDA of 15 mg and a limit of 1,000 mg for supplemental vitamin E, and it notes that high doses may raise bleeding risk, including with anticoagulants (NIH ODS, Vitamin E). The label's 27 mg is a middle amount. High-dose omega-3 may prolong bleeding too (NIH ODS, Omega-3 Fatty Acids). Whether either matters for you is a question for the person who reads your INR.
We cannot tell you the capsule will leave your INR alone. Nobody has published a test of Reviralis with warfarin.
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See packsMedicine check04
What should you ask your pharmacist or anticoagulation clinic?
Ask before the first capsule, not after the first odd test result.
- Show the Supplement Facts panel and the blend line. Say the amounts are not printed.
- Ask whether to test the INR sooner after a start, and how soon.
- Ask what bruising, nosebleeds or dark stools should make you call the clinic.
Keep taking warfarin exactly as prescribed. Do not skip a dose to make room for a supplement. The medicine check page lists what the label and its sources say for each medicine kind.
Safety05
When is bleeding an emergency?
Call 911 for bleeding that will not stop, a hard blow to the head, vomiting blood, or sudden confusion with a severe headache.
Black or bloody stools, a nosebleed that lasts past ten minutes of pressure, or large new bruises need a same-day call to your clinic.
The label is not meant for anyone under 18, and it asks pregnant or nursing readers, people with a medical condition and people with a history of seizures to consult a provider first. See the side effects page and the medicine check for the full cautions, and the post on questions to ask your pharmacist for a longer list. The Supplement Facts page types out every line.
FAQ06
Reviralis questions people ask
Does Reviralis Complete contain vitamin K?
No vitamin K line is printed among the 22 vitamin and mineral amounts, and the 18 blend names do not include it. The label therefore gives no vitamin K figure to add to your diet, which is the number a warfarin clinic watches.
Can I take a multivitamin while on warfarin?
Many people do, but only after the clinic knows. A steady routine matters, because starting, stopping or changing a supplement can move the INR. Show the panel to your pharmacist and ask whether to test sooner.
How soon after a new supplement should the INR be checked?
Your own clinic sets that, usually sooner than a routine visit. Ask when you decide to start. We publish no schedule, because it depends on your dose, history and other medicines.
Should I stop warfarin if I want to try a supplement?
No. Keep taking prescribed medicine exactly as directed, because stopping an anticoagulant without your prescriber can be dangerous. Ask about the supplement first and let the clinic decide whether and how to start it.
Who wrote this07
Written and reviewed by
Pages built from the label, the sales page and linked NIH, CDC, FDA, FTC, Mayo Clinic and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a U.S. stocking partner for Reviralis. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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