It’s late summer in Bedford, and the sun is high, the air is warm, and the days are long. As we enjoy the season, it’s a good time to think about everyday nutrition, including the vitamins that feature in many combination supplements. Many of our customers ask about vitamin K2 with D3 products, and how to make sense of the amounts on the label. While the science around these nutrients is still evolving, there are some key points to consider when choosing supplements that include both vitamin K2 and D3.
What the research says
Vitamin K2 and D3 are often sold together, and the authorised claims on the GB nutrition and health claims register help explain the thinking. In the register’s wording, vitamin D contributes to normal absorption and utilisation of calcium and phosphorus, and vitamin K contributes to the maintenance of normal bones. A 2025 study on vitamin K intake in the Mexican population looked at how best to measure vitamin K2 status accurately, which matters for researchers studying these nutrients; it did not set out dosage recommendations.
Research into how K2 and D3 relate to one another is ongoing, and there is no definitive answer on the exact amounts people might need. Some studies have explored higher intakes of both nutrients, but the findings are not yet conclusive, and they are not a reason to take more than the dose stated on the label. More research is needed before firmer guidance can be given for different groups of people.
One of the challenges in comparing products is that individual circumstances vary with factors like age, diet, and sun exposure. For example, people who spend a lot of time indoors get less sunlight on their skin, which is where the body makes its own vitamin D; official UK advice is that everyone should consider a daily 10 microgram vitamin D supplement during the autumn and winter months. There is no established requirement to balance vitamin D with a matching amount of K2, so the sensible approach is simply to read the label and see what each product provides.
How to choose
When looking for a supplement that includes K2 with D3, it’s important to pay attention to the form and strength of the ingredients. For example, Calcium/Magnesium/Vitamin D3 with Vitamin K2 Tablets combine several nutrients in a single tablet, and in the authorised register wording calcium, magnesium and vitamin D each contribute to the maintenance of normal bones. These tablets are a practical option for people who prefer one supplement rather than several separate ones.
Another thing to consider is the form of the K2. Some products use menaquinone-7 (MK-7), one of the forms of vitamin K2 commonly used in supplements. Source of Life® Garden Vitamin K2 120mcg Capsules are a vegan option that provides a clearly stated amount of K2 per capsule, which may suit those who follow a plant-based diet. It’s always a good idea to check the label to see which form of K2 is used and what the dosage is.
It’s also worth looking at the other ingredients in the supplement. For example, Calcium & Vitamin K2 60 capsules include calcium, which in the authorised wording is needed for the maintenance of normal bones. As with any combination product, the label shows how much of each nutrient you get per dose, so you can compare products like for like. If you’re unsure about which product to choose, it’s always a good idea to speak to a member of our team in the shop for guidance.
If you take any medication or are pregnant, please speak to your GP or pharmacist before starting any new supplement. We are always happy to help you find the right product for your needs, and we can answer any questions you may have about the ingredients or how to use them.