Vitamin K2 should be selected by menaquinone form, assay, trans-cis profile, carrier, stability, packaging and destination-market requirements—not only by the phrase “Vitamin K2.”
MK-7, MK-4 and other menaquinone forms may have different source materials, specifications, stability characteristics and formulation formats. Buyers should define the required form before requesting samples or quotations.
1. What Is Vitamin K2?
Vitamin K2 refers to a group of menaquinone compounds. Commercial Vitamin K2 ingredients may be supplied as powders, oil dispersions, beadlets or premixes depending on the form and intended application.
The chemical form, assay basis, source, carrier and stability profile should be stated clearly in the product specification.
2. MK-7, MK-4 and Vitamin K2 Form Selection
| Vitamin K2 Form | Buyer Consideration | Required Verification |
|---|---|---|
| MK-7 | Commonly evaluated for supplement and nutritional formulations | Assay, trans-cis profile, source, carrier and stability |
| MK-4 | May have different formulation and regulatory requirements | Chemical identity, assay, activity basis and documentation |
| Oil-Based K2 | Suitable for softgels, oils and selected lipid formulations | Carrier oil, concentration, oxidation stability and homogeneity |
| Powder or Beadlet | Suitable for tablets, capsules, powders or premixes | Particle size, bulk density, flowability, carrier and assay uniformity |
3. Assay and Trans-Cis Profile
Buyers should confirm both the total menaquinone assay and the relevant isomer or trans-cis profile where applicable.
The product specification should state:
- Exact menaquinone form.
- Assay and analytical method.
- Trans-cis or isomer profile where relevant.
- Reference standard.
- Carrier and concentration.
- Actual batch result.
- Calculation basis.
The term “natural Vitamin K2” should be supported by source and process documentation. Buyers should not assume that a product description proves natural origin, isomer profile or regulatory suitability.
4. Stability and Packaging
Vitamin K2 should be protected from light, oxygen, heat and unsuitable moisture conditions.
- Use light-protective packaging.
- Minimize oxygen exposure during filling and handling.
- Review the carrier or oil system.
- Check oxidation indicators where applicable.
- Confirm stability in the final capsule, tablet, powder or softgel.
- Review transportation and storage conditions.
Raw-material shelf life does not automatically establish finished-product shelf life. The finished product should be tested in its final packaging.
5. Vitamin K2 for Different Formulations
Tablets and Capsules
Review powder flowability, particle size, bulk density, carrier content, assay uniformity and compatibility with excipients.
Softgels and Oil-Based Products
Confirm the carrier oil, concentration, homogeneity, oxidation stability, light protection and storage conditions.
Functional Foods and Powders
Evaluate dispersion, taste, stability, heat exposure and compatibility with minerals, proteins, sweeteners and other functional ingredients.
6. What Should Appear on a Vitamin K2 COA?
A complete Vitamin K2 COA should identify the menaquinone form, assay, isomer profile, batch and stability-related information.
- Product name and chemical identity.
- Specific menaquinone form.
- Batch or lot number.
- Assay and analytical method.
- Trans-cis or isomer profile where applicable.
- Carrier and concentration.
- Moisture and physical properties.
- Heavy metals and microbiology.
- Oxidation-related data where relevant.
- Manufacturing date and expiry or retest date.
- Packaging and storage conditions.
7. Buyer Qualification Checklist
- Confirm the exact menaquinone form.
- Review assay and analytical method.
- Check trans-cis or isomer profile where relevant.
- Confirm carrier, concentration and physical form.
- Review light, oxygen and oxidation stability.
- Check heavy metals, microbiology and moisture.
- Request a batch-specific COA.
- Review packaging, storage and shelf life.
- Confirm market-specific regulatory documents.
- Confirm MOQ, lead time and delivery terms.
Frequently Asked Questions
What is the difference between MK-7 and MK-4?
MK-7 and MK-4 are different menaquinone forms. They may differ in source, assay, stability, formulation format and regulatory documentation. Buyers should specify the required form directly.
What should appear on a Vitamin K2 COA?
The COA should identify the menaquinone form, assay, analytical method, batch number, trans-cis or isomer profile where applicable, carrier, moisture and storage information.
How should Vitamin K2 be protected from oxidation?
Vitamin K2 should be protected from light, oxygen, heat and unsuitable moisture conditions. Packaging and finished-product stability should be evaluated for the selected grade.
Which Vitamin K2 form is suitable for softgels?
Oil-based Vitamin K2 preparations may be considered for softgels, but the carrier oil, concentration, homogeneity, oxidation stability and packaging must be verified.
Can Vitamin K2 be used in mineral or functional food products?
Some grades may be suitable for functional-food or supplement development. Compatibility with minerals, proteins, sweeteners, heat processing and packaging should be evaluated in the final product.
Can Blueeyes Bio provide Vitamin K2 technical documents?
Blueeyes Bio can discuss available Vitamin K2 grades, menaquinone forms, technical documents and commercial quantities according to the buyer’s application and destination market.
