Get 30% OFF Your First Subscription with Code SUB30
Dark blue supplement bottle with three white capsules against a powder blue background.
BrainMD Vitamin D3 + K2: infographic, list of phrases highlighting benefits encircling blue supplement bottle, sky background
BrainMD Vitamin D3 + K2: woman holds blue supplement bottle to forehead against yellow exterior background
BrainMD Vitamin D3 + K2: raw powders of the two ingredients, brief descriptions against a light blue background
BrainMD Vitamin D3 + K2: woman holds blue supplement bottle against a blurred yellow exterior background
BrainMD Vitamin D3 + K2: infographic, supplement facts box

Vitamin D3 + K2

Vitamin D3 + K2

High potency vitamin D3 + K2*

Subscribe & Save
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.*

  • Free Shipping on Orders $75+
  • Subscribe & Save up to 25% + Free Shipping
  • 100% Money Back Guarantee

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

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.*
BrainMD Vitamin D3 + K2: supplement bottle with capsules on the side against a light blue backdrop

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)
BrainMD Vitamin D3 + K2: person lifting a supplement bottle from a round end table.
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.

BrainMD Vitamin D3 + K2: one supplement bottle leaning on another against a light blue background

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.).*