Introduction
Vitamin K2 refers to a group of compounds called menaquinones (MKs), which differ by the length of their side chain. The most researched and widely available form is menaquinone‑7 (MK‑7). Unlike short‑chain menaquinones, MK‑7 has a long side chain (seven isoprene units), which gives it a half‑life of about 3 days in the bloodstream. This means a single daily dose is sufficient to maintain steady vitamin K2 activity throughout the day [1].
Think of vitamin K2 (MK‑7) as your body's "calcium traffic controller." Your body needs calcium to build strong bones, but calcium that ends up in the wrong place-such as inside artery walls-can be harmful. MK‑7 activates two key proteins that work together: one that pulls calcium into your bones (osteocalcin) and another that blocks calcium from depositing in your arteries (matrix Gla protein, or MGP) [2].
MK‑7 is produced through natural bacterial fermentation using Bacillus subtilis – the same microorganism used to make natto, a traditional Japanese fermented soybean dish naturally rich in vitamin K2. This fermentation process yields the biologically active all‑trans configuration, which is the only form proven to effectively activate the carboxylase enzyme that switches on osteocalcin and MGP. Vitamin K2 (MK‑7) has self‑affirmed GRAS status in the United States, received Novel Food approval from the European Food Safety Authority (EFSA), and is now permitted as a food nutrition fortification substance in China under GB 1903.81‑2025.
Physicochemical Properties & Specifications
| Property | Value |
|---|---|
| CAS Number (MK-7) | 2124-57-4 |
| Molecular Formula | C₄₆H₆₄O₂ |
| Molecular Weight | 648.99 – 649.02 g/mol |
| Appearance | Pale yellow to off-white to yellow crystalline powder |
| Odor / Taste | Almost odorless, tasteless |
| Melting Point | 112–115°C (decomposes) |
| Solubility in Water | Insoluble |
| Solubility in Organic Solvents | Soluble in ethanol, methanol, acetone, chloroform, diethyl ether, DMSO; soluble in vegetable oils |
| Isomeric Configuration | All‑trans (biologically active only; cis‑isomers have unknown activity) |
| All‑Trans MK-7 Purity | ≥ 97% (high‑purity grade) |
| Assay Purity | 98.0–102.0% (USP specifications) |
| Loss on Drying | ≤ 5.0% |
| Total Ash | ≤ 0.1% |
| Heavy Metals | ≤ 10 ppm |
| Lead (Pb) | ≤ 0.5 ppm |
| Arsenic (As) | ≤ 1 ppm |
| Mercury (Hg) | ≤ 0.1 ppm |
| Cadmium (Cd) | ≤ 1 ppm |
| Total Aerobic Microbial Count | ≤ 1000 cfu/g |
| Yeast & Mold Count | ≤ 100 cfu/g |
| E. coli | Negative in 1g |
| Salmonella | Negative in 25g |
| Storage Temperature | 2–8°C (refrigerated) |
| Storage Conditions | Well‑closed container away from moisture, light, and oxygen; protect from heat |
| Shelf Life | 24–48 months (depending on formulation and packaging) |
| GHS Hazard Classification | Not classified as hazardous at low concentrations (<1%); standard laboratory precautions for concentrated form |
Mechanism of Action
Vitamin K2 (MK‑7) acts as an essential helper (cofactor) for an enzyme called gamma‑glutamyl carboxylase. This enzyme "switches on" two calcium‑handling proteins that are critical for bone and heart health [1][2].
Step 1: Activating the Proteins
Without enough vitamin K2, two important proteins remain in their inactive (undercarboxylated) forms:
- Osteocalcin (OC) – the protein responsible for guiding calcium into your bone matrix.
- Matrix Gla Protein (MGP) – the protein that protects your arteries by blocking calcium deposits.
When you take MK‑7, it helps the carboxylase enzyme add a carboxyl group (–COOH) to these proteins, converting them into their active forms (carboxylated osteocalcin and carboxylated MGP) [2].
Step 2: Calcium Goes Where It Belongs – Into Bones
Active osteocalcin acts like a calcium magnet. It binds to calcium circulating in your blood and pulls it into the bone matrix, making your bones denser, stronger, and more resistant to fractures. MK‑7 also upregulates osteoprotegerin, a protein that blocks RANKL – a molecule that would otherwise trigger bone breakdown. By inhibiting RANKL, MK‑7 helps reduce bone loss [1].
Step 3: Calcium Is Blocked from Entering Arteries
Active MGP is one of your body's most powerful natural defenders against vascular calcification – the buildup of calcium crystals inside artery walls. MGP binds to calcium crystals and prevents them from settling in arteries, keeping your blood vessels flexible and your heart healthier [2].
Additional Benefits: Reducing Inflammation and Protecting Nerves
Beyond calcium management, MK‑7 also helps:
Lower inflammation – It reduces the production of pro‑inflammatory signals such as IL‑1α, IL‑1β, and TNF‑α, which are linked to many chronic diseases [1].
Protect nerve cells – Because MK‑7 is fat‑soluble, it can cross the blood‑brain barrier and may help protect nerve cells. Clinical studies have shown that MK‑7 supplementation may improve symptoms of peripheral neuropathy [1].
In a Nutshell:
| Action | Where It Happens | What MK‑7 Does |
|---|---|---|
| Activates osteocalcin | Bones | Pulls calcium into the bone matrix → stronger bones |
| Activates MGP | Arteries | Blocks calcium from depositing in artery walls |
| Reduces inflammation | Whole body | Lowers harmful inflammatory signals |
| Protects nerves | Nervous system | May improve nerve function and reduce neuropathy symptoms |
So when you take vitamin K2 as MK‑7, you are giving your body the key it needs to build strong bones and protect your heart – two essential functions that work together to keep you healthy as you age.
Health Benefits
1 Strengthens Bones and Reduces Fracture Risk
MK‑7 activates osteocalcin, which binds calcium into your bone matrix, improving bone quality and microstructure – not just bone density. Research shows that MK‑7 supplementation reduces the risk of bone fractures, with the greatest benefit seen in people who start with low vitamin K status [1][3].
2 Protects Your Arteries and Supports Heart Health
MK‑7 activates matrix Gla protein (MGP), your body's most powerful natural inhibitor of artery calcification. A 2025 clinical trial (VitaK‑CAC) showed that two years of MK‑7 supplementation significantly slowed the progression of coronary artery calcification in patients with mild to moderate artery disease [3].
3 Works Together with Vitamin D3 and Calcium
Think of vitamin D3 as the delivery truck that picks up calcium from your food and sends it into your bloodstream. Vitamin K2 (MK‑7) is the traffic controller that directs calcium into your bones and keeps it out of your arteries. Taking vitamin D3 without enough K2 can actually increase the risk of calcium depositing in the wrong places. For maximum bone and heart benefit, MK‑7 should be taken alongside D3 and calcium.
4 Reduces Chronic Inflammation
MK‑7 helps lower levels of pro‑inflammatory molecules such as IL‑1α, IL‑1β, and TNF‑α. By keeping inflammation under control, MK‑7 supports your body's natural defense systems and may help reduce the risk of inflammatory diseases [1].
5 Supports Nerve Health
Because MK‑7 is fat‑soluble, it can cross the blood‑brain barrier. Emerging research suggests that MK‑7 may help protect nerve cells and improve symptoms of peripheral neuropathy – a condition that causes nerve pain, tingling, and numbness, often seen in people with metabolic disorders [1].
Applications
1 Dietary Supplements
MK‑7 powder is widely used in multivitamins, standalone K2 supplements (typical daily doses: 45–360 µg), K2+D3 combination formulas, liquid softgels, tablets, capsules, sublingual sprays, and gummies. MK‑7 is the preferred form because its long half‑life (about 3 days) allows once‑daily dosing.
2 Functional Foods & Beverages
Commonly fortifies plant‑based milks, breakfast cereals, nutritional bars, protein powders, dairy products, ready‑to‑drink beverages, and functional foods. Microencapsulated MK‑7 is often used to protect stability during processing and extend shelf life.
3 Pharmaceutical Formulations
Used as an API in high‑dose K2 capsules for bone health, combination D3+K2 products for osteoporosis, and prescription formulas for specific medical conditions.
4 Infant Formula & Children's Nutrition
MK‑7 is naturally present in breast milk and is essential for proper bone development in infants and children. Synthetic MK‑7 is now permitted for use in infant formula in many markets.
5 Animal Nutrition & Pet Food
Added to livestock, poultry, and aquaculture feed to support bone health and calcium metabolism. Also used in senior pet formulas and plant‑based pet foods.
6 Cosmetics & Personal Care
MK‑7 is occasionally used in anti‑aging creams, eye serums (to help reduce dark circles), and skin‑brightening formulations for its antioxidant properties.
Frequently Asked Questions (FAQ)
Q: Why is MK‑7 preferred over other forms of vitamin K2?
A: MK‑7 has a long side chain (seven isoprene units), which gives it a half‑life of about 3 days in the blood. This means a single daily dose is enough to maintain steady activation of osteocalcin and MGP throughout the day. Shorter‑chain menaquinones (like MK‑4) have much shorter half‑lives and require multiple daily doses. MK‑7 is also the most clinically researched form for both bone and cardiovascular benefits [1].
Q: Why is "all‑trans" purity important?
A: The all‑trans configuration is the naturally occurring, biologically active form of MK‑7. It is the only isomer that can properly bind to and activate the carboxylase enzyme that switches on osteocalcin and MGP. Cis‑isomers (non‑natural configurations) have unknown or reduced activity in the body. High‑quality MK‑7 products should be labeled as "all‑trans" [2].
Q: Is MK‑7 suitable for vegan and Halal formulations?
A: Yes. Our MK‑7 is produced via natural bacterial fermentation using Bacillus subtilis on plant‑based substrates. No animal‑derived ingredients are used. Halal, Kosher, and Vegan certifications are available upon request.
Q: Is MK‑7 safe to take with blood thinners (anticoagulants)?
A: Vitamin K is essential for the activation of several blood‑clotting proteins. Patients taking oral anticoagulants such as warfarin (Coumadin) should not take vitamin K2 supplements without first consulting their physician, because vitamin K can interfere with the medication's effectiveness.
Q: How stable is MK‑7 in finished products?
A: MK‑7 is sensitive to light, air (oxygen), heat, and moisture. To maximize stability: use UV‑blocking packaging (amber glass, foil pouches), add antioxidants (tocopherols), store at 2–8°C, avoid high heat and shear processing, and consider microencapsulation. Properly formulated, MK‑7 retains potency for 24–48 months.
Q: What packaging options are available?
A: Aluminum foil bags (1–5 kg, inert gas‑flushed), sealed plastic drums (10–25 kg), fiber drums (25–50 kg), and customized packaging.
Q: Can I receive a sample before a bulk order?
A: Yes. Lab‑scale samples (5–50g) are available for formulation development and quality testing. Samples ship within 3–5 business days.
Why Choose Us?
Your Professional Manufacturing & Sourcing Partner
We are more than a supplier - we are a comprehensive supply chain partner dedicated to high-quality ingredients, custom formulations, and finished products across multiple industries.
Professional Expertise
With years of experience in plant extracts, food additives, cosmetic raw materials, and nutritional ingredients, our team brings deep technical knowledge and market insight to every partnership.
01
Diverse Product Range
We offer a broad range of products, including food additives, plant extracts, fruit & vegetable powders, cosmetic actives, and functional food ingredients.
02
One-Stop Shop
Raw Materials: High-purity ingredients for food, beverage, supplement, and cosmetic applications.
Finished Products: In-house manufacturing of capsules, soft gels, gummies, liquid drops, and blended powders.
03
OEM/ODM/OBM Services
Label Design & Packaging: Custom branding tailored to your target market.
Formulation & R&D: Expert support to develop custom blends, proprietary formulas, and innovative products.
Global Logistics: Reliable shipping, documentation, and customs clearance support.
04
Quality Assurance
Strict adherence to GMP standards and full regulatory transparency. We stay current with global requirements, including FDA GRAS, EFSA, and other regional regulations, to ensure your products meet the highest safety and compliance standards.
05
Act Now
Ready to formulate with premium Vitamin K2 (MK‑7) Powder?
Bulk Orders & Contract Manufacturing: Inquire about volume discounts, long‑term supply agreements, and private‑label manufacturing.
Please contact us at ella.zhang@huilinbio-tech.com.
References
Hot Tags: vitamin k2 (mk-7) powder (menaquinone-7), China, suppliers, manufacturers, factory, wholesale, buy, price, bulk, pure, natural, high quality, in stock, for sale, Vitamin Series, Vitamin H Biotin Powder, L Ascorbic Acid Powder Vitamin C, Pigment Powder, Vitamin B3 Niacinamide Powder
