Vitamin K
Scored by the Formulate Research Team · Last reviewed July 2026
Overview: Thorne Vitamin K
Helps maintain bone mineral density and supports healthy blood vessels* Each capsule of Thorne’s Vitamin K formula provides 3 clinically studied forms of vitamin K – vitamin K1 and two types of K2 (MK-4 and MK-7) – for comprehensive blood vessel and bone support.*
Score Breakdown
Formulate scores every product across six weighted dimensions. Each dimension is graded independently — hover or tap to see what drove each component.
Ingredients per Serving
| Ingredient | Amount |
|---|---|
| Vitamin K16 systematic reviews · 51 randomised trials | 12180 mcg |
| K19 systematic reviews · 52 randomised trials | 2 mg |
| K2MK-416 systematic reviews · 51 randomised trials | 10 mg |
| K2MK-716 systematic reviews · 51 randomised trials | 180 mcg |
Certifications & Testing
Other Ingredients
Microcrystalline Cellulose, Hypromellose (derived from cellulose) capsule, Silicon Dioxide, Vitamin E (Mixed Tocopherols)
Recommended Use
Take 1 capsule one to two times daily or as recommended by your health-care practitioner.
Warnings
ALLERGY WARNING: This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients. PREGNANCY: If pregnant, consult your health-care practitioner before using this product. INTERACTIONS: As Vitamin K interferes with the effect of anticoagulant drugs (like Coumadin), the concurrent use of these agents should be avoided.
Frequently Asked Questions
What is Thorne Vitamin K's Formulate score?
Thorne Vitamin K scores 93 out of 100 (grade A) on Formulate's ingredient-level rubric, which weighs evidence quality, dose accuracy, bioavailability, transparency, safety, and manufacturing practices.
Is Thorne Vitamin K worth it?
Thorne Vitamin K scores 93/100 (grade A). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in Thorne Vitamin K?
Each serving contains Vitamin K (12180 mcg), K1 (2 mg), K2 (10 mg), K2 (180 mcg). Serving size: 1 Capsule. 60 servings per container.
How do I take vitamin k?
Take 1 capsule one to two times daily or as recommended by your health-care practitioner.
Who makes Vitamin K?
Vitamin K is made by Thorne. See Formulate's full grade and product lineup for Thorne on its brand page.
Is Thorne Vitamin K third-party tested?
Thorne lists the following certifications and testing for this product: Gluten Free, Soy Free, Dairy Free, Natural Flavors, Natural Colors, Made in USA, Third-Party Contents Certified, Thorne Verified, GMP Certified.
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Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.