Free shipping over $99

For all online orders
Our product promise

Quality, production, testing
30-day refund policy

Find out more here

 chevron_left chevron_right
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2
chevron_leftchevron_right

Vitamin D3/K2

$30.36
$37.95 $30.36

Vitamin D3/K2 is a daily liquid formula designed to support immune health, bone strength, and healthy calcium utilization using targeted fat-soluble nutrients so you can build a strong foundation for whole-body wellness.

Supports immune regulation, skeletal integrity, and cardiovascular system support

Quantity

In Stock

Pickup currently unavailable at
Vitamin D3/K2

Vitamin D3/K2

$30.36
$37.95 $30.36

Free delivery on orders over $99

Key highlights
  • Supports immune function and healthy immune response
  • Supports bone strength and skeletal integrity
  • Supports healthy calcium absorption and utilization
  • Supports activation of vitamin K–dependent proteins involved in bone and vascular health
  • Supports overall whole-body wellness

How to use

Serving size: 1 mL
Servings per container: About 59

Suggested use: Take 1 mL daily with food and water, preferably with a meal containing healthy fats for optimal absorption.

Optional routine:

  • Start with 0.5 mL daily for 3–5 days, then increase to the full 1 mL serving.
  • Take earlier in the day if you are sensitive to supplements that support energy or immune function.

Ingredients

Key ingredients:

  • Vitamin D3 (cholecalciferol) – 50 mcg (2000 IU)
  • Vitamin K1 (phytonadione)
  • Vitamin K2 (menaquinone-7, MK-7)
  • Vitamin E (antioxidant support)

Want full details? Scroll down for the full Supplement Facts panel, ingredient-by-ingredient breakdown, and research links.

Other ingredients: Vegetable glycerine, purified water.

Shipping & returns

If you’re looking to return or exchange your order for whatever reason, we're here to help! We offer free returns within 30 days of purchase.

You can return your product for store credit, a different product, or a refund to the original payment method.
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2
Vitamin D3/K2

Why you'll love it

chevron_left chevron_right

Thoughtfully Formulated Foundation

Formulated with 2000 IU of vitamin D3 plus both K1 and K2 (MK-7) to support proper calcium utilization and vitamin K–dependent protein activation. Every batch is crafted to align with evidence-informed dosing for daily foundational support.

Daily Immune & Bone Support

Vitamin D3 is studied for supporting immune function and immune regulation, while vitamin K2 supports activation of proteins involved in bone and vascular health. Together, they help you maintain strength and resilience year-round.

Easy Liquid Routine

A simple 1 mL liquid serving makes it easy to personalize your dose and stack with your daily supplements. Subscribe and save so your foundational nutrients are always covered.

Image
Image
Image
Click to view the full table

Supplement Facts
Serving Size: 1 mL
Servings Per Container: About 59

(Insert Supplement Facts image here)

Per 1 mL serving:
Vitamin D (as cholecalciferol) – 50 mcg (2000 IU) – 250% DV
Vitamin K – 275 mcg – 229% DV
• Vitamin K1 (phytonadione) – 250 mcg
• Vitamin K2 (menaquinone-7) – 25 mcg

Other ingredients: Vegetable glycerine, purified water, vitamin E.

Key Ingredients

Vitamin D3 (Cholecalciferol, 50 mcg / 2000 IU)

Supports immune function and whole-body wellness.

Learn More

Vitamin D3 (Cholecalciferol, 50 mcg / 2000 IU)

Vitamin D3 is the bioactive form of vitamin D produced in the skin in response to sunlight. It plays a central role in immune system signaling and is studied for supporting immune regulation and overall health. Long-term research has also examined its role in immune-related outcomes and maintaining healthy physiological function. It is included in this formula at 2000 IU to provide a strong daily foundation for immune and bone support.

Vitamin K (K1 + K2 MK-7, 275 mcg total)

Supports activation of vitamin K–dependent proteins involved in bone and vascular health.

Learn More

Vitamin K (K1 + K2 MK-7, 275 mcg total)

Vitamin K is a fat-soluble nutrient required for activation of specific proteins in the body. Vitamin K2 (MK-7) has been studied for improving vitamin K–dependent protein activation, including osteocalcin, which plays a role in bone health, and matrix Gla protein, involved in vascular function. Vitamin K1 contributes to overall vitamin K status. This formula combines both forms to complement vitamin D3 and support proper calcium utilization.

Vitamin K2 (MK-7, 25 mcg)

Supports healthy calcium utilization.

Learn More

Vitamin K2 (MK-7, 25 mcg)

Vitamin K2 as menaquinone-7 is a highly bioavailable form of vitamin K. It has been studied for improving carboxylation of osteocalcin, a marker of vitamin K–dependent protein activation. Proper activation of these proteins supports healthy calcium distribution in the body. It is included alongside vitamin D3 to provide complementary support for bone and vascular systems.

See More Ingredients
Image

Why Dr. Brighten Recommends It

Many women are low in vitamin D due to limited sun exposure, indoor lifestyles, and seasonal shifts. Foundational fat-soluble nutrients play an important role in immune resilience and skeletal integrity.

I formulated Vitamin D3/K2 around three priorities:

  1. Immune system support and healthy immune regulation
  2. Healthy calcium absorption and utilization
  3. Activation of vitamin K–dependent proteins involved in bone and vascular health

I recommend Vitamin D3/K2 for women who want foundational support for immune health and bone strength, especially during low-sun seasons or periods of increased demand.

Ask a clinician first if you are pregnant, nursing, trying to conceive, taking blood-thinning medications, or managing a medical condition.

Research Shows

What the Research Shows: Clinical Evidence Summary

Vitamin D3/K2 provides cholecalciferol (D3) and K vitamins (K1 phytonadione + K2 menaquinone-7) at doses supporting foundational micronutrient status for immune, hormonal, and vascular pathways. Note: Individual ingredient RCTs typically evaluate single agents at higher or similar doses; evidence on D3+K2 combinations is emerging but mechanistic.

*These studies explore outcomes related to individual ingredients used in Vitamin D3/K2. Research on individual ingredients does not necessarily reflect the effect of the full formula. When study doses differ from Vitamin D3/K2, we note it. Not intended to diagnose, treat, cure, or prevent any disease.

Vitamin D3 (cholecalciferol, 50 mcg/2,000 IU per serving)
 Studied for: reduced risk of acute respiratory tract infections (ARTIs) in meta-analysis of RCTs, especially with daily/weekly dosing and in those with low baseline status; potential testosterone support in deficient overweight men (RCT).bmj+1
Dose note: BMJ meta-analysis trials used 400–4,000 IU/day equivalents; testosterone RCT used 3,332 IU/day. Formula: 2,000 IU/serving. (BMJ)
Further reading:
Martineau et al., 2017 (individual participant data meta-analysis, 25 RCTs, 10,933 participants): BMJ
 Pilz et al., 2011 (RCT, overweight men with low D status): PubMed
 Lerchbaum et al., 2017 (RCT, healthy men): JCEM
 PubMed overview on D and immunity: PubMed

Vitamin K (K1 phytonadione 250 mcg + K2 menaquinone-7 25 mcg, total 275 mcg per serving) Studied for: activation of vitamin K–dependent proteins (e.g., matrix Gla protein) involved in inhibiting vascular calcification; improved arterial stiffness in postmenopausal women (RCT).thieme-connect+1 Dose note: Arterial stiffness RCT used 180 mcg MK-7/day; valve calcification RCT used 720 mcg MK-7/day + D. Formula: 25 mcg MK-7 + 250 mcg K1/serving. (Thieme Connect) Further reading: Knapen et al., 2015 (double-blind RCT, postmenopausal women): Thieme Connect
 Brandenburg et al., 2022 (RCT, aortic valve calcification): PMC
 MK-7 clinical trials summary (MenaQ7): MenaQ7 PDF

30-Day Guarantee

Try Vitamin D3/K2 for 30 days. If it’s not for you, contact our team for help with next steps.

FAQ

How long does one bottle last?

At 1 mL per day, one bottle lasts about 59 days.

When should I take it?

Take with a meal that contains healthy fats, preferably earlier in the day.

Can I take it every day?

Yes, this formula is designed for daily foundational use unless otherwise directed by your clinician.

Can I take it with other supplements?

Yes. It pairs well with magnesium, omega-3s, and multivitamins. If you take blood-thinning medications, consult your clinician before use.

Is this safe if I am trying to conceive, pregnant, or nursing?

Consult your healthcare provider to ensure it fits your individual needs.

What if I have a sensitive stomach?

Taking it with food typically improves tolerance.

Who is this not for?

Those on anticoagulant therapy or with medical conditions affecting vitamin K metabolism should consult a clinician before use.

Pairs well with

chevron_left chevron_right