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Vitamin D3 + K2

Vitamin D3 + K2

High potency vitamin D3 + K2*

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One-time purchase

Description

This powerful combination of vitamin D3 (as cholecalciferol) and vitamin K2 (as MK-7) helps strengthen bones, promote cardiovascular health, fight oxidative stress, support the immune system, preserve cognitive function and more.*

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Key Benefits

Mood

Circulation

Immunity

Key Ingredients

We only use clinically researched ingredients backed by science. Every formula is crafted with pure, high-quality nutrients at effective doses designed for safety, potency, and real results you can trust.
BrainMD Vitamin D3 + K2: infographic supplement facts box
Soy Free
Gluten Free
Sugar Free
Dairy & Egg Free
Soy Free
Gluten Free
Sugar Free
Dairy & Egg Free

Vitamin D3

125 mcg [5000 IU]
Vitamin D3, often called the “sunshine vitamin,” is essential for overall health and is produced in the skin when exposed to sunlight.* The liver and kidneys convert vitamin D3 into an active hormone that supports bone growth, immune function, brain health, and heart function.* Unlike vitamin D2, D3 is more effective at raising and maintaining vitamin D levels in the body.* It also plays a key role in promoting healthy mood balance and cognitive performance, making it vital for both physical and mental well-being.*

Vitamin K2

180 mcg
Vitamin K2 is essential for guiding calcium to the right places in the body.* It activates proteins that help direct calcium into bones and teeth—where it strengthens structure—and away from arteries, where buildup can be harmful.* This dual action supports both bone density and cardiovascular health.* Especially important during and after menopause, Vitamin K2 helps maintain strong bones and a healthy heart by keeping calcium in balance.*
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Supported by Clinical Research

Vitamin K2 Supports Bone and Cardiovascular Health

Systematic reviews and clinical research on K2

Vitamin K2 (menaquinone) has been shown to support bone mineralization and inhibit arterial calcification. It's especially relevant in postmenopausal osteoporosis and early-life development.

(Schwalfenberg 2017)

(Ma 2022)

(Kozio-Kozakowska 2022)
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Scientific Dose, Superior Form

D3 + K2 That Actually Works

Unlike other vitamin D supplements, our Vitamin D3 + K2 supplement uses the biologically active form of vitamin D (cholecalciferol), which raises blood levels of the vitamin more effectively and for a longer period than vitamin D2.* 

Making this supplement even more effective is a highly bioactive form of vitamin K2, menaquinone-7 (MK-7). Clinical research shows that MK-7 increases bone mineral density and promotes better bone quality and strength than other forms of vitamin K.*

Expert Reviews

“This synergistic combination is so powerful, it’s like sunshine in a bottle and can help support your mood, bone health, immune function, and cognition.”

Dr. Daniel Amen

Founder, BrainMD & Amen Clinics
BrainMD Vitamin D3 + K2: woman's hand holding up capsule with white powder against a blue sky
Two Nutrients, One Powerful Pair

Why D3 Needs K2—And Vice Versa

Research shows vitamin D helps regulate over 2,000 genes and is needed by almost every part of your body to function and thrive. It helps regulate your immune system, aids in calcium absorption, balances your mood, and promotes optimal health.* When paired with vitamin K2, vitamin D3 helps move calcium into your bones (where it’s needed most), which prevents it from forming deposits in your arteries and blood vessels.* Together, this dual-action nutrient combination supports strong bones, a healthy heart, and sharper brain.*
BrainMD Vitamin D3 + K2: woman in yellow dress holds supplement bottle in a field of yellow flowers

What To Expect

Week 1

Vitamin D3 starts raising blood levels of 25(OH)D, supporting immune function and mood balance. Some people notice an early lift in energy and outlook.*
Week 4

Consistent supplementation helps regulate calcium absorption. You may begin to feel steadier energy, stronger immunity, and better recovery from daily stressors.*
2–3 Months

Vitamin D3 + K2 work together to direct calcium into bones (not arteries). Expect noticeable improvements in bone and joint comfort, cardiovascular health, and long-term resilience.*
6 Months+

With sustained use, this powerful combination helps optimize bone density, maintain healthy blood vessels, and strengthen immune defenses year-round—supporting whole-body vitality and healthy aging.*

FAQ

Got questions? We’ve got answers. Explore our FAQs or chat with our AI assistant for instant support.

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How do I take Vitamin D3 + K2?

For adults 18 and older, it is suggested to consume 1 capsule daily, preferably in combination with a meal or snack containing healthy fat for maximum absorption (olive oil, avocado, coconut oil, etc.).*

Overall rating: 4.8937197 / 5 from 207 reviews.

AI Generated Review Summary

Vitamin D3 + K2 capsules are praised for their small size and ease of swallowing, offering great quality and value for money. Customers appreciate the cleanliness and effectiveness of the Vitamin D, and the supplement is noted for its positive impact on energy and stress management. While some users report noticeable improvements, others do not observe significant changes.

Summary topics

  • Capsule Size and Ease of Swallowing: 3%
  • Product Quality: 11%
  • Value for Money: 8%
  • Vitamin D Cleanliness: 5%
  • Daily Supplement Effectiveness: 12%

Review topics: ["results","quality","improvement","absorption","feel","benefits","price","difference","works","supplement","vitamin d","vitamins","capsules","level","health","combo","doctor","choice","combination","clarity","magnesium","change","addition"].

Review highlights

  • "Love this product, high quality, great price and helpful customer service." — Jenna B.
  • "Essential daily supplement and I feel so much better!" — Echo J.
  • "It really makes a difference on how I feel mentally during the winter months." — Marco L.

Reviews

Good, not great product.

"I trust the quality of the product. I cannot tell a difference, but I'm using it preventatively or to sustain health verses correct it. I do wish it came with the required magnesium. I'm glad it's D3 plus K2 for effectiveness."

— Carrie D. (4/5)

Good product

"I have been taking the Vitamin D3+K2 for well over a year now. I believe it is working. Last time my vitamin d level was checked, it was well within the normal range. I like BrainMD products because they have good bioavailability and I feel like I get good value from their products."

— Tina S. (5/5)

Good Product

"At my age I noticed and could feel my bones when turning in my bed. I definitely feel improvements in the last month after taking this consistently for 2 months. No more rough bone feeling. It puts the calcium where it needs to go and takes it from the places it doesn't need to accumulate."

— Angela L. (5/5)

Great product!!

"Vitamin D3+K2 is a great product I feel I have more energy."

— Rebecca P. (5/5)

Good health

"I don’t get vitamin D like I should. This is a big help. Thanks Brain MD."

— Liesa D. (5/5)

D3 and Vitamin K

"Everything with Brain MD is high quality and works better than anything I buy at the grocery store."

— Cameo R. (5/5)

Great quality

"I really enjoy consuming this vitamins. I have taken this vitamin for over two years now. Excellent product!"

— Cintia S. (5/5)

Love this D3+K2 -- it's a great addition to my regimen

"I am so thrilled that this supplement is offered through Brain MD. I take this daily, and a little extra while I'm sick, and I'm happy to know the high quality of this product. I highly recommend this!"

— Elizabeth E. (5/5)

D3 and K2 are important together

"I purchase this because it's important to get K2 with vit D3 because K2 will direct where the calcium goes in your body, otherwise when you're taking a vit D3 supplement, calcium can go to areas that it shouldn't go in. It's also important to take magnesium with these too."

— Crissy S. (5/5)

Petite but powerful ;)

"I like that it’s a small enough capsule to swallow easily and that it contains more d3 than the previous d3/k2 capsule I used to take 🙏"

— Viv J. (5/5)

Q&A