Educational information for caregivers. It is not medical advice and does not replace instructions from the prescriber, anticoagulant clinic, or pharmacist who looks after the person you support.
The short answer: what a complete vitamin K list for a care team should hold
When someone takes warfarin or a similar anticoagulant, a useful vitamin K list records every product that could contain vitamin K, in a form any clinician can read in seconds: the name as printed on the label, the form, the dose on the label and how often it is taken, and the prescriber or person who recommended it. Add the date each item started, changed, or stopped, and keep the same list in the same place for everyone involved in care.
Why this matters: the National Institutes of Health Office of Dietary Supplements says people taking warfarin and similar anticoagulants need a consistent vitamin K intake from food and supplements, because sudden changes can increase or decrease the anticoagulant effect (NIH ODS, Vitamin K fact sheet for health professionals). A list cannot make that happen on its own, but it lets the care team see what is going in and when something changed.
A quick note on the “K2” in the title: the NIH fact sheet describes vitamin K as occurring in two main forms. K1 (phylloquinone) is found mainly in green leafy vegetables, while K2 (menaquinones) is mostly of bacterial origin and present in modest amounts in some animal-based and fermented foods (NIH ODS). For a care team, the form matters less than making sure every vitamin K source is written down.
This page is about coordination. It does not recommend adding vitamin K2, stopping it, or changing any medicine. Those decisions belong to the prescriber and anticoagulant clinic.
Why vitamin K belongs on a care team's list
The NIH fact sheet describes vitamin K as having a serious and potentially dangerous interaction with anticoagulants such as warfarin (NIH ODS). Its consumer version advises people on warfarin to keep the amount of vitamin K from food and supplements about the same every day, and to tell their doctor, pharmacist, and other health care providers about any supplements and prescription or over-the-counter medicines they take (NIH ODS, Vitamin K consumer fact sheet).
A UK hospital leaflet makes the same point from the clinic side: a consistent intake of vitamin K foods helps keep INR results and warfarin dose more likely to stay stable, while significant day-to-day or week-to-week changes may affect the INR (Cambridge University Hospitals, dietary advice for patients taking warfarin). MedlinePlus also tells people to share with their doctor and pharmacist every prescription and nonprescription medicine, vitamin, and supplement they take or plan to take while on warfarin (MedlinePlus, warfarin).
For caregivers, the practical problem is usually not the knowledge. It is that several people handle pills, shop for groceries, or attend appointments, and nobody has the full picture in one place.
The continuity card: one entry per product
Copy these fields onto paper, a shared note, or the medication record you already keep. Fill in one card for each product or item, using what is printed on the container rather than memory.
- Name: the exact product name on the label, plus the brand or maker. Write the whole name, not a nickname such as “the bone pill.”
- Form: which vitamin K form the label lists. The NIH fact sheet notes that standalone supplements may contain phylloquinone (vitamin K1), phytonadione, MK-4, or MK-7 (NIH ODS). If the label simply says “vitamin K,” write that and note that the form is not stated.
- Dose: the amount per serving as printed on the label, the serving size, and how often the person actually takes it. Record what is happening, even if it differs from the label directions.
- Prescriber or recommender: who suggested or approved it, such as a named doctor, pharmacist, or dietitian. If the person started it on their own or on a relative's suggestion, write that plainly. “Unknown” is a useful answer; it tells the care team what to ask.
- Dates: when it started, when the amount or brand changed, and when it stopped.
- Where it comes from: a standalone supplement, a multivitamin, a combination bone-health or heart-health product, or something else. Vitamin K is present in most multivitamin and mineral supplements, usually at less than 75 percent of the Daily Value according to the NIH fact sheet (NIH ODS), so a multivitamin belongs on the list too.
Then add one separate card at the top for the anticoagulant itself:
- Medicine name and strength as written on the pharmacy label.
- Prescriber and the clinic or service that manages monitoring, with a phone number.
- Date of the last monitoring check, if the family knows it, and any date the dose was changed by the clinic.
Finally, add a short line for food and eating pattern notes: for example, “dietitian or clinic gave written food guidance on [date]” or “no written guidance received.” The Cambridge leaflet lists many vitamin K foods, including green leafy vegetables, and advises discussing with a doctor before significant changes to diet, such as starting a weight-loss diet or becoming vegetarian or vegan (Cambridge University Hospitals). The card records what the household eats and who advised it; it does not decide what the person should eat.
A blank example you can copy
- Name: [exact label name and maker]
- Form: [as printed, or “not stated”]
- Dose: [amount per serving on label] / [servings taken] / [how often]
- Prescriber or recommender: [name, or “self-started,” or “unknown”]
- Started / changed / stopped: [dates]
- Source type: [standalone, multivitamin, combination product]
- Last shown to the anticoagulant clinic or pharmacist: [date]
What the card can and cannot establish
It can give the care team an accurate, dated record of what the person takes, show whether a product changed shortly before a monitoring result moved, and reveal gaps such as an item nobody can name a prescriber for. It also gives a new caregiver, a hospital team, or a visiting nurse the same starting picture.
It cannot tell you whether a product is safe for this person, whether any amount of vitamin K2 is appropriate, or how the person's monitoring result will respond. Nothing on this page sets a vitamin K2 amount for someone on an anticoagulant, and it does not suggest that research on K2 shows a benefit from any particular seller's product. It also cannot confirm that a label matches what is in the bottle.
Information that is often missing from a first draft of the card:
- The exact vitamin K form, when the label only says “vitamin K.”
- Whether a multivitamin or a combination product adds vitamin K on top of a standalone product.
- Who actually started each item and whether the anticoagulant clinic knows about it.
- Whether the amount taken has been the same from week to week, because the sources above stress consistency from day to day and week to week.
Unresolved questions for the care team rather than the family to answer: whether vitamin K from a given product matters for this person's specific anticoagulant, how their own results have responded in the past, and what the clinic wants done when a product changes. The sources cited here address warfarin and “similar anticoagulants” in general terms; they do not replace the clinic's instructions for one person's medicine.
The next steps that need a professional, or a regulator
Professional input. Any decision to start, stop, switch, or change the amount of a vitamin K product, to change the anticoagulant, or to change the person's eating pattern should come from the prescriber, the anticoagulant clinic, or the pharmacist. The sources above say to tell these professionals about supplements, including ones the person only plans to take (MedlinePlus). If the card shows a product nobody has told them about, that is the next phone call.
Regulator input. If a product's label looks unclear or you suspect a product problem or a reaction, the U.S. Food and Drug Administration runs MedWatch, which it describes as its medical product safety reporting program for health professionals, patients, and consumers (FDA MedWatch). Ask the pharmacist or the FDA whether your specific concern belongs there. If the person lives outside the United States, ask the pharmacist which body handles product problems where you live.
Signs to act on quickly
MedlinePlus lists symptoms that should prompt a call to the doctor immediately for someone taking warfarin, including bleeding that will not stop, nosebleeds, bleeding gums, and coughing up or vomiting blood. It also says to call the doctor after unusual bleeding or after a fall that causes injury, especially a blow to the head, and to tell all health care providers that the person takes warfarin (MedlinePlus). If you are unsure how urgent something is, call the prescriber or anticoagulant clinic, say that the person takes an anticoagulant, and follow any urgent-contact instructions the clinic has already given you. Keep a copy of the continuity card with the person's medicine supplies so any provider can see it quickly.
What a caregiver can do this week
- Gather every bottle, box, and pouch the person uses, including multivitamins, bone or heart products, and anything bought online or brought by relatives.
- Fill in one card per item from the labels, and mark every “unknown.”
- Add the anticoagulant card and the prescriber's contact details.
- Take the cards to the next appointment, or call the anticoagulant clinic or pharmacy and read them out, asking which items matter for this person's medicine.
- Do not stop, add, or change any product because of this page. Write down the clinic's answer, with the date and the name of the person who gave it.
- Update the cards whenever a product, brand, or amount changes, and share the updated copy with everyone who helps with care.
Related reading on this site
For a general record of every medicine, vitamin, and supplement, see Caregiver Medication Lists: A Shared Record for Appointments and Emergencies. For wider background on supplements and anticoagulants, see Blood Thinners and Supplement Interactions: What Seniors and Caregivers Need to Know About Warfarin and DOACs. For general background on what vitamin K2 is, see Vitamin K2 for Senior Bone and Cardiovascular Health: Aging Adult Profile. That background article is general information; for anyone on an anticoagulant, the prescriber's instructions come first.
About this page
Mercy Assisted Care (MercyAssistedCare.org) publishes this page as general educational content for caregivers. It is not medical care, it is not an assessment of any individual person, and it does not replace the advice of the person's own clinicians. It does not sell or rank any product, contains no affiliate links, and makes no claim that vitamin K2 or any supplement will improve a health outcome. It was prepared from the sources listed below.
Sources
Source pages were opened and checked on October 6, 2026.
- National Institutes of Health, Office of Dietary Supplements. Vitamin K: Fact Sheet for Health Professionals (page shows updated March 29, 2021).
- National Institutes of Health, Office of Dietary Supplements. Vitamin K: Fact Sheet for Consumers (page shows updated March 22, 2021).
- Cambridge University Hospitals NHS Foundation Trust. Dietary advice for patients taking warfarin (approved April 16, 2025, version 2).
- MedlinePlus, U.S. National Library of Medicine. Warfarin (page shows last revised March 15, 2026).
- U.S. Food and Drug Administration. MedWatch: The FDA Safety Information and Adverse Event Reporting Program.
Related guides
- Caregiver Medication Lists: A Shared Record for Appointments and Emergencies
- Blood Thinners and Supplement Interactions: What Seniors and Caregivers Need to Know About Warfarin and DOACs
- How to Track a Loved One’s Daily Function Without Turning It Into Surveillance
- How to Prepare for a Caregiver Respite Conversation