The 60-Second Answer
Yes, natto and selected cheeses are the most practical K2 rich fermented foods for menopause. Natto provides especially concentrated MK-7, while Gouda, Jarlsberg, and Camembert contribute varying amounts. Kefir supplies less. These foods support nutrition, but no established K2-specific requirement guarantees protection against osteoporosis or cardiovascular disease.
Fermented Foods Supply Different Vitamin K Forms
Vitamin k1 and k2 are different forms of vitamin k. Vitamin k1 is found mainly in green leafy vegetables, while animal products and fermented foods supply menaquinones, collectively called K2.
Both k1 and k2 support essential functions. The different forms of vitamin k2 include MK-4, MK-7, and longer-chain menaquinones.
Natto, made from fermented soybeans, is a particularly concentrated source of vitamin k2. Selected fermented dairy products also contribute, although their vitamin k content varies substantially.
Foods High In Vitamin K2 Vary By Production
A food’s vitamin k2 concentration depends on its bacterial cultures, ingredients, and processing. Cheese ripening and geographic origin can also influence vitamin k2 content.
These estimates describe tested samples, not guaranteed levels of vitamin k2 in every brand.
| Food | Practical Portion | Approximate K2 | Main Consideration |
|---|---|---|---|
| Natto | 30 g | 271 mcg MK-7 | Concentrated fermented soybean option |
| Gouda, approximately 13 weeks aged | 30 g | 20 mcg total K2 | Protein and calcium |
| Camembert | 30 g | 20 mcg total K2 | Variable by production |
| Brie | 30 g | 4 mcg total K2 | Lower in tested samples |
| Kefir | 200 g | 10 mcg MK-9 | Modest contribution |
Natto and kefir measurements come from Tarvainen and colleagues; cheese measurements come from Vermeer and colleagues. Amounts of vitamin k2 and the balance of individual vitamin k forms differ between products. www.sciencedirect.com
Natto Is Rich In Vitamin K2
Among the top foods high in vitamin K2, natto stands out. This known source of vitamin k2 contains substantial MK-7 produced during bacterial fermentation.
Its sticky texture and strong flavor can take adjustment. Try a small portion with rice, vegetables, or an egg rather than treating it as a medicinal vitamin k2 food.
Fermented Dairy Provides Variable K2 Content
Gouda and Jarlsberg are useful sources of K2, while Brie generally contributes less. Fermented dairy also supplies protein and calcium, making it nutritionally relevant beyond K2.
Kefir is a fermented milk drink, but “probiotic-rich” does not guarantee high K2 content. Other foods contain vitamin k2 in smaller amounts, including eggs and selected animal products.
Fermented Vegetables Are Unreliable K2 Sources
Sauerkraut and kimchi can contribute nutrients, but fermented vegetables should not be your main K2 strategy. The benefits of fermented foods depend on the product, and some are high in sodium.
Foods rich in vitamin K are not necessarily rich in vitamin K2. Spinach and kale are rich in vitamin k1, supporting intake of vitamin k1 rather than providing concentrated K2.
Vitamin K Supports Bone Protein Activation
Declining estrogen changes signaling through hormone receptors and accelerates bone breakdown. This metabolic shift increases the importance of bone health during menopause; estrogen deficiency is a major contributor to postmenopausal osteoporosis. pubmed.ncbi.nlm.nih.gov
Progesterone also declines, but K2-rich foods do not replace either hormone.
Vitamin k is a fat-soluble nutrient involved in protein activation. Put simply, vitamin K is a fat-soluble vitamin, and meal fat supports absorption.
Vitamin k2 activates vitamin k-dependent proteins through carboxylation. These include osteocalcin, involved in bone mineralization, and matrix Gla protein, which helps inhibit inappropriate calcification.
Vitamin k plays a role in normal clotting, and vitamin k is essential for this function. The role of vitamin k2 extends beyond clotting, but describing it as “moving calcium into bones” oversimplifies the mechanism.
Benefits Of Vitamin K Have Evidence Limits
The health benefits of vitamin K include established physiological functions. Whether increasing vitamin k2 intake prevents fractures or improves heart health is a separate question.
Research suggests that vitamin k2 may improve certain markers, but evidence evaluating vitamin K’s clinical effects remains mixed. Studies assessing the efficacy of vitamin K cannot automatically establish benefits from ordinary food portions. ods.od.nih.gov
Benefits Of Vitamin Require Careful Measurement
A 2026 randomized trial studied Jarlsberg in 57 postmenopausal women and older men. Researchers found that vitamin k2-rich cheese consumption improved bone turnover markers, with a small lumbar-spine bone-density increase after 32 weeks, suggesting that vitamin K-containing foods deserve further research.
However, the trial was small, received industry and public funding, and did not establish fracture prevention. Cheese contains other active compounds, so the influence of vitamin K2 cannot be isolated. pmc.ncbi.nlm.nih.gov
This distinction is important for vitamin K research: circulating vitamin K, protein activation, bone density, and fractures measure different outcomes.
Consistent Meals Support Vitamin K Nutrition
Your body needs vitamin K, but there is no established menopause-specific intake of vitamin k2. The U.S. adequate intake is 90 micrograms daily for adult women, covering total vitamin K rather than K2 alone.
To get enough vitamin K, prioritize a variety of foods:
- Start with 10–15 grams of natto at lunch, increasing toward 30 grams if tolerated.
- Include approximately 30 grams of Gouda or Jarlsberg when it suits your meals.
- Eat leafy green vegetables regularly as a vitamin k-rich food.
- Take these foods with meals; vitamin K is fat soluble, so some dietary fat supports absorption.
- Discuss changes with your prescriber if taking warfarin, which can block vitamin K recycling.
Consistent dietary vitamin k intake matters with warfarin. Higher intake of vitamin K is not automatically better, and vitamin k2 supplements are not routinely necessary for everyone. ods.od.nih.gov
Frequently Asked Questions
What Are The Best Food Sources Of Vitamin K2?
Natto and selected cheeses are the most practical sources of vitamin K2. Choose foods that are high in nutrients you need, including protein and calcium. These vitamin k2-rich foods complement overall nutrition.
Is Natto Enough Vitamin K2 For Bone Health?
Natto supplies substantial K2, but no proven food dose guarantees stronger bones. Calcium, vitamin D, protein, and exercise remain essential. Your Second Spring deserves comprehensive support.
Does Gouda Provide Enough K2 During Menopause?
Gouda can contribute to intake of vitamin K2, but its content varies. No menopause-specific K2 requirement exists. Balance cheese portions with your overall diet.
Can Gut Bacteria Prevent Vitamin K Deficiency?
Bacteria produce menaquinones found in fermented foods and the intestine, but their contribution to requirements is uncertain. Low vitamin K intake does not automatically indicate vitamin k deficiency or low vitamin k status. Vitamin k levels require clinical interpretation. pmc.ncbi.nlm.nih.gov
Continue Your Journey
Your Second Spring deserves nourishment grounded in evidence. Explore the importance of vitamin K through Why Is Vitamin K2 The “Missing Link” For Menopause Bone And Heart Health? Discover what research supports, where uncertainty remains, and how everyday choices strengthen your long-term nutrition.
References
- NIH Office of Dietary Supplements. Vitamin K: Health Professional Fact Sheet. 2021. Full Text.
- Tarvainen M, et al. Food Chemistry. 2019;275:515–522. doi:10.1016/j.foodchem.2018.09.136.
- Vermeer C, et al. Nutrients. 2018;10:446. doi:10.3390/nu10040446.
- North American Menopause Society. Osteoporosis position statement. Menopause. 2021;28:973–997. PubMed.
- Lundberg HE, et al. Jarlsberg randomized clinical trial. BMJ Nutrition, Prevention & Health. 2026;9:e001436. doi:10.1136/bmjnph-2025-001436.
- Walther B, et al. Advances in Nutrition. 2013;4:463–473. doi:10.3945/an.113.003855.
