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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: 4.901786 / 5 from 224 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%): Customers raved about the small and easy-to-swallow capsules, praising their effectiveness and ease of use.
  • Product Quality (11%): Customers expressed appreciation for the great quality of the products, which was mentioned multiple times in the reviews.
  • Value for Money (8%): It was reported by customers that the price of the product is great and offers good value for money.
  • Vitamin D Cleanliness (5%): Customers raved about the Vitamin D, praising its cleanliness and lack of fillers.
  • Daily Supplement Effectiveness (12%): It was observed by customers that this supplement is a great and excellent daily option for their daily routine.

Review topics: [improvement, quality, results, absorption, benefits, feel, ingredients, works, body, price, difference, service, supplement, vitamins, combo, vitamin d, capsules, level, combination, change, pills, brainmd, effect, health, mood, addition, magnesium, choice, doctor, clarity].

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

Love the D3K2

"I take this with the omega by brain Md for full absorption. Brain Md vitamins have changed my life! I take a combo of Happy Saffron - for depression Neurolink - for adhd Stress relief - for menopause symptoms I no longer take rx and I manage everything with brain Md"

— Andrea T. (5/5)

A daily must take!

"My husband & I have been taking this supplement every day for a very long time. Combined with our daily Neurovite Plus and the Happy Saffron Plus Gummies we feel a lot better in terms of energy and mood."

— LG (5/5)

Good product

"I buy the majority of my supplements from Brain MD. I trust the quality of their products, and this one is no different . It's an essential part of my daily routine. Feel good on it."

— Suzi A. (5/5)

Necessary supplement -what’s not to like?

"Approx 20 years ago, I went from a lifetime of great health to doctor-hopping to discover what was wrong with me. It was a rheumatologist to finally did a blood test and discovered my Viramin D was close to nil and also the first signs of what I later found out to be an autoimmune disorder. I have never been so amazed by what Vitamin D did for me. My hands couldn’t even close fully! All that joint pain and stiffness went away and has never come back. I learned from a different specialist to use D3 and not whatever was currently on market and also to make sure to take it with Vitamin K to protect arteries. AMEN clinics formula met these criteria."

— Ann P. (5/5)

Excellent product

"We have tried other brands of Vitamin D3 and my daughter prefers this brand over other good quality brands and notices improvement in her symptoms more so with this brand."

— Lois H. (5/5)

Sunshine in a bottle

"My husband and I live in St. Louis, where sunshine is limited in winter months. We need this supplement to maintain a healthy balance of nutrients. D3 and K2 do the trick for us. We trust Brain MD and have for years."

— Jane P. (5/5)

Makes all the Difference

"This is a phenomenal Vit D supplement. There are many others out there with the same ingredient percentages, but the BrainMD quality is impossible to beat. Spend the extra and you will see the difference."

— Summer S. (5/5)

Best Vitamin D

"I’ve been taking this vitamin d for a year now. I absolutely love it. I feel a difference in my energy level especially."

— Jessica R. (5/5)

Fast delivery and no issue

"Fast delivery and no issue with the pill size. I feel better"

— Karriemen R. (5/5)

Vitamin D3 + K2

"Brain MD Vitamin D + K2 is easy to swallow and its one per day dosage is convenient. My last D3 reading had improved since taking this formula."

— Toby T. (5/5)

Q&A