Vitamin K2
Overview
Vitamin K2 for Dogs
Vitamin K2 is a fat-soluble vitamin that plays a key role in a dog’s bone strength, joint flexibility, heart health, and overall well-being. It helps the body properly use calcium: guiding it into bones and teeth where it strengthens skeletal structure, while keeping it away from areas where excess calcium can cause problems, like arteries, cartilage, and soft tissues.
There are two natural forms of Vitamin K: Vitamin K1 (phylloquinone) and Vitamin K2 (menaquinones). K1 is mostly involved in blood clotting, while K2 supports calcium metabolism and helps maintain long-term skeletal and cardiovascular health.
Vitamin K2 comes in different forms, the most important being:
- MK-4, found in animal-based foods like meat, eggs, and dairy, which is quickly absorbed and used in tissues like bones and arteries.
- MK-7, found in fermented foods like certain cheeses and natto, which stays active in the body longer and plays a role in vascular health.
As dogs grow and age, their bodies naturally produce K-dependent proteins—some of which help regulate calcium, while others can contribute to inflammation, bone loss, and hardened arteries if not properly controlled. Vitamin K2 helps ensure these proteins function correctly, directing calcium where it’s needed and keeping soft tissues flexible.
Since a dog’s diet largely determines its intake of Vitamin K2, pet parents interested in supporting strong bones, flexible joints, and heart health may want to consider whether their dog’s food provides adequate levels. Vitamin K2 works alongside other nutrients like Vitamin D and calcium to help maintain a balanced approach to skeletal and cardiovascular wellness.
Why Do Dogs Need Vitamin K2?
- Supports Strong Bones – Helps calcium build healthy bones while preventing bone loss.
- Protects Joint & Soft Tissue Health – Prevents excess calcium buildup in cartilage, arteries, and organs.
- Helps the Body Regulate Calcium – Ensures calcium is used efficiently for long-term health.
- Maintains Heart Health – Supports proper blood vessel function and circulation.
How K2 Differs from K1
Vitamin K1 (found in leafy greens) primarily supports blood clotting, while K2 plays a broader role in calcium metabolism and long-term skeletal health. Since dogs don’t convert K1 to K2 very efficiently, their primary sources of K2 come from animal-based foods like organ meats, egg yolks, and fermented foods.
Foods
Food sources of Vitamin K2
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Food Components
Ingredient sources of Vitamin K2
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General Health Topics
Health Topics related to Vitamin K2
Health Conditions
Health conditions related to Vitamin K2
Follow the Research
Studies providing deeper insight into Vitamin K2
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| Bacillus subtilis: a universal cell factory for industry, agriculture, biomaterials and medicine | At a Glance This peer-reviewed mini-review (Microbial Cell Factories, 2020) explains why Bacillus subtilis is considered a reliable microbial “cell factory.” The authors describe how this bacterium grows quickly, thrives on inexpensive substrates, and naturally secretes proteins, making it easier to recover useful products. They also highlight the mature set of genetic tools that allow scientists to fine-tune how the microbe works. Together, these qualities make B. subtilis a platform for producing enzymes, vitamins (such as riboflavin [B2] and menaquinone-7 [K2/MK-7]), biomaterials, and probiotic applications. Connecting the Dots |
| Regulation of bone remodeling by vitamin K2 | At a Glance This article, published in Oral Diseases in 2017, reviews how Vitamin K2 regulates bone remodeling, the process of breaking down and rebuilding bone tissue. The findings suggest that Vitamin K2 supports bone density, reduces fracture risk, and may help prevent osteoporosis, especially when combined with Vitamin D3. The research primarily examines human, rat, and mouse models to understand Vitamin K2’s role in skeletal health. Connecting the Dots |
| The relationship between vitamin K and osteoarthritis: A review of current evidence | At a Glance This 2020 review examines the relationship between Vitamin K status and osteoarthritis (OA), focusing on how Vitamin K influences cartilage calcification, inflammation, and joint degeneration. The findings suggest that sufficient Vitamin K levels may help slow OA progression by regulating proteins that prevent abnormal calcium buildup in joints. While the study focuses on human OA research, it may have implications for canine joint health and mobility. Connecting the Dots |
| The relationship between vitamin K and osteoarthritis: A review of current evidence | At a Glance This 2020 review examines the relationship between Vitamin K status and osteoarthritis (OA), focusing on how Vitamin K influences cartilage calcification, inflammation, and joint degeneration. The findings suggest that sufficient Vitamin K levels may help slow OA progression by regulating proteins that prevent abnormal calcium buildup in joints. While the study focuses on human OA research, it may have implications for canine joint health and mobility. Connecting the Dots |
| Vitamin K2 in animal health: An overview | At a Glance This 2016 review article surveyed what was known about vitamin K2 across species. The authors explain how K2 activates proteins that regulate bone and cartilage health, blood clotting, inflammation, kidney function, and vascular calcification. They also highlight a gap in companion animal nutrition: most commercial pet foods use synthetic K3 (menadione), which does not provide the same benefits as natural K2. The paper underscores the need for targeted research to understand whether dogs and cats could gain broader health advantages from true K2. Connecting the Dots |
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Q/A's related to Vitamin K2
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