Why is there so much silicone dioxide in each capsule? I would not expect this from Thorne.

The amount of silicon dioxide in Thorne’s 3-K Complete is less than 2 percent of the total formula and does not affect the quality, efficacy, or safety of the finished product. Silicon dioxide is used to minimize moisture content and to help powders flow into capsules. Although silicon is sometimes confused with silicone (which is a synthetic compound), there is no chemical similarity between these two substances. Silicon dioxide is a naturally-occurring compound that contains silicon, a mineral that is ubiquitous in nature and found in many foods, especially those high in fiber, and, because it is necessary for bone growth and maturation, it is also often added to nutritional supplements designed for bone support.

How much Vitamin E is in this?

Thorne’s 3-K Complete contains 350 mcg of vitamin E, as mixed tocopherols, per capsule.

what is the source of the K-2?

The vitamin K (K1 and K2) in Thorne's 3-K Complete is from natural source geraniol, a monoterpenoid and an alcohol derived from rose oil, palmarosa oil, and citronella oil.

What is the vitamin a from? is it a natural source or synthetic? i see it is not soy. sunflower oil?

Thorne’s Vitamin K (formerly 3-K Complete) contains vitamin K1 and K2 (MK-4 and MK-7). The vitamin K1 and K2 (MK-7) are synthetic, vitamin K2 (MK-4) is derived from geraniol.

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Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bones* - Clinically Studied Ingredients - Third-Party Certified - Gluten, Dairy & Soy-Free - 60 Capsules

Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bones* - Clinically Studied Ingredients - Third-Party Certified - Gluten, Dairy & Soy-Free - 60 Capsules

Product ID: 63157445

Details

Brand
THORNE
Diet Type
Gluten Free
Flavor
Unflavored
Item Form
Capsule
Primary Supplement Type
Vitamin K1 K2

💊3 clinically studied Vitamin K forms

🔬Third-party tested & certified

🦴Supports bone strength & density

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Description

🦴 Elevate your bone game with clinically proven Vitamin K power!

EASY DAILY WELLNESS - Unflavored, easy-to-swallow capsules designed for your busy, health-conscious lifestyle.
PURE CLEAN FORMULA - Gluten, dairy, and soy-free with third-party certification ensuring purity and potency.
CLINICALLY PROVEN TRUSTED - Backed by science and chosen by 100+ pro sports teams for peak performance and health.
BONE BUILDERS BEST FRIEND - Optimizes calcium use with vitamin D and magnesium to keep bones dense and arteries clear.
TRIPLE ACTION VITAMIN K POWER - Harness the synergy of K1, MK-4, and MK-7 for unmatched bone and cardiovascular support.

THORNE Vitamin K capsules deliver a potent blend of three clinically studied forms of vitamin K (K1, MK-4, MK-7) to support strong bones and cardiovascular health. Third-party certified and free from gluten, dairy, and soy, this trusted supplement is favored by professional athletes and healthcare practitioners alike, ensuring purity, potency, and optimal calcium utilization for a healthier you.

Specifications

ASIN	B0797N3F9T
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#4,615 in Health & Household ( See Top 100 in Health & Household ) #30 in Vitamin D Supplements
Brand	THORNE
Brand Name	THORNE
Customer Reviews	4.8 out of 5 stars 1,674 Reviews
Diet Type	Gluten Free
Dosage Form	Capsule
Flavor	Unflavored
Item Dimensions	2.09 x 2.09 x 3.72 inches
Item Form	Capsule
Manufacturer	Thorne Research
Manufacturer Part Number	K171
Model Number	K171
Number of Items	1
Primary Supplement Type	Vitamin K1, Vitamin K2
Specific Uses For Product	Bone
UPC	693749006619
Unit Count	60 Count

Reviews

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24.01.2026

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29.04.2026

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3.04.2026

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1.05.2026

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23.02.2026

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7.02.2026

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4.04.2026

A**A

6.02.2025

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