Product Overview
The THORNE Vitamin K Supplement (Model K171) is formulated to provide essential Vitamin K in three clinically studied forms: Vitamin K1, Vitamin K2 as MK-4, and Vitamin K2 as MK-7. This supplement is designed to support bone strength and density, maintain arterial health and flexibility, and assist in the normal blood clotting function.
- Comprehensive Formula: Contains Vitamin K1, Vitamin K2 (MK-4), and Vitamin K2 (MK-7).
- Bone Health Support: Works with Vitamin D to promote bone strength and density, and with magnesium to direct calcium to bones.
- Heart Health Support: Contributes to the health and elasticity of arteries and supports blood clotting.
- Quality Assurance: Third-party certified to ensure ingredients match the label and are free from unsafe contaminants.
- Trusted Brand: Recommended by health-care practitioners and used by professional sports teams.

Usage Instructions
For optimal results, follow the recommended dosage:
- Dosage: Take 1 capsule one to two times daily.
- Administration: Consume with water or as directed by your health-care practitioner.

Important Safety Information
Please read the following safety guidelines before using this product:
- Pregnancy: If pregnant, consult your health-care practitioner before using this product.
- Anticoagulant Drugs: As Vitamin K interferes with the effect of anticoagulant drugs (such as Coumadin), concurrent use of these agents should be avoided.
- Side Effects: Contact your healthcare professional immediately if you experience any unwanted side effects.
- Medical Advice: The information provided is for informational purposes only and does not establish a doctor-patient relationship. Always consult your physician before taking this or any other product.
Ingredients
Each capsule of THORNE Vitamin K Supplement contains:
| Ingredient | Amount per Capsule | % Daily Value |
|---|---|---|
| Vitamin K (Total) | 6,090 mcg | 5,075% |
| K2 (as MK-4) | 5 mg | |
| K1 | 1 mg | |
| K2 (as MK-7) | 90 mcg |
Other Ingredients: Microcrystalline Cellulose, Hypromellose (derived from cellulose) capsule, Silicon Dioxide, Vitamin E (Mixed Tocopherols).

Storage and Handling
To maintain product quality and efficacy:
- Store in a cool, dry place.
- Keep out of reach of children.
- Do not use if the safety seal is broken or missing.
Product Specifications
| Specification | Detail |
|---|---|
| Model Number | K171 |
| Brand | THORNE |
| Item Form | Capsule |
| Primary Supplement Type | Vitamin K1, Vitamin K2 |
| Diet Type | Gluten Free |
| Flavor | Unflavored |
| Servings | 60 Servings |
Manufacturer Information
Manufacturer: Thorne Research
THORNE products are manufactured in the USA using US and imported ingredients. The state-of-the-art, 549,000+ square foot campus is located in Summerville, South Carolina, featuring ISO Level 7 clean rooms for manufacturing and laboratory testing.

Official Product Videos
3-K Complete - Vitamins K1 and K2 for Heart and Bone Support
Video: An informational video from Thorne (Pattern.) explaining the benefits of 3-K Complete for heart and bone health.
Thorne Supplements - No Standard Higher
Video: A video from iServe Products (Thorne reseller) highlighting Thorne's commitment to high standards in supplement manufacturing.
What is Thorne's "No List"?
Video: A video from iServe Products (Thorne reseller) explaining Thorne's "No List" of undesirable ingredients.
3-K Complete | Thorne (Preview)
Video: A short preview video from Thorne (Pattern.) introducing the 3-K Complete supplement.
Legal Disclaimer
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. Please contact your healthcare professional immediately if you experience any unwanted side effects. The information contained herein is for informational purposes only and does not establish a doctor-patient relationship. Please be sure to consult your physician before taking this or any other product. Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
Warranty and Support
For questions regarding product quality, ingredients, or general support, please refer to the official THORNE website or contact their customer service directly. Specific warranty details for dietary supplements typically relate to product integrity and expiration dates, which are printed on the product packaging.
Visit the THORNE Store on Amazon for more information and product offerings.




