• BONE & IMMUNITY
1 4

Bone & immunity · Adults 50+

D3+K2

D3+K2

The two vitamins your bones can't put to work alone.

Vitamin D3 helps your body absorb calcium. Vitamin K2 (as MK-7) helps direct that calcium into bone instead of letting it settle in your arteries. Taken together, they form the cornerstone of healthy aging for skeletal strength, immune resilience, and cardiovascular wellness.

  • Bone density
  • Calcium balance
  • Immune support
  • Heart health
  • Gluten free
  • Vegan
  • Non-GMO
  • 3rd party tested
  • GMP certified
  • Made in the USA
  • Free shipping On orders $40+
  • Pause anytime No commitment
  • Third-party tested Every batch
Dr. Margaret Reeves, MD ·

"After menopause and into our 70s, bone loss accelerates. D3 alone helps you absorb calcium - but K2 is what tells your body where to put it. Both, daily, is the simplest evidence-based choice I can recommend."

Dr. Margaret Reeves, MD · Clinical Advisory · Geriatric Medicine

View full details
WHY D3 + K2

The pairing that finally answers “where does the calcium go?”

D3 alone tells your body to absorb calcium. K2 tells it where to deposit that calcium - into bone, not soft tissue. We pair both at researched doses so the work doesn’t stop halfway.

01

D3 unlocks calcium

Vitamin D3 is what allows the gut to absorb dietary calcium in the first place. Without it, even a calcium-rich diet does little for your bones.
02

K2 directs it home

K2 activates the proteins (osteocalcin, MGP) that move calcium into bone and keep it out of arteries.
03

MK-7, not MK-4

We use menaquinone-7 from natto fermentation. It stays bioavailable in the body for 72+ hours - versus a few hours for synthetic K2 forms.
04

Researched doses

5,000 IU D3 and 100 mcg K2 MK-7 - the levels actually used in peer-reviewed bone-health and cardiovascular trials. Not a token sprinkle.
BUILD YOUR ROUTINE

Pairs well with.

D3 + K2 is a complete bone-and-immune foundation on its own. If you want to round out the routine, here's where most customers go next.
HEART & BRAIN
Omega-3

Omega-3

Heart and brain health support.

A high-concentration fish oil delivering 1,200 mg EPA and 900 mg DHA in every serving. ...

$29.90 $25.42 / 30 days
SLEEP & RECOVERY
Magnesium

Magnesium

Sleep, relaxation, and muscle support.

Formulated to support relaxation, restful sleep, muscle function, and a calm, balanced ...

$28.45 $24.18 / 30 days
Verified · Reviews

What customers say.

Inside the formula

Two vitamins. One job they can't do apart.

Most D3 supplements stop at absorption. K2 finishes the work - directing calcium to bone where you want it, and away from arteries where you don't. We dose both at the levels used in the clinical research.

Ingredient 01

Cholecalciferol · Sunshine vitamin

Vitamin D3

Cholecalciferol · the form your skin makes from sunlight

After 50, the skin synthesizes less vitamin D from the same sun exposure, and most adults run measurably low - especially through the winter. D3 supports calcium absorption, immune cell signaling, and muscle function. We use 5,000 IU, the dose most clinical bone-health protocols target.

5,000 IU
Per daily serving
42%
Of US adults are deficient
125mcg
Researched daily dose
Ingredient 02

Menaquinone-7 · From natto

Vitamin K2 (MK-7)

Fermented from Bacillus subtilis natto · the long-acting form

MK-7 activates osteocalcin (which binds calcium into bone) and matrix-Gla protein (which helps keep arteries clear). Unlike short-acting MK-4, MK-7 from natto fermentation stays active in circulation for 72+ hours - making once-daily dosing work the way the label says.

100mcg
Per daily serving
72hr
Active half-life in body
3yr
Bone-density trial duration
How to take it

A simple daily routine.

1

One softgel with breakfast

D3 and K2 are fat-soluble, so absorption is best with a meal that includes some fat-eggs, avocado, yogurt, or a tablespoon of olive oil all work.
2

Stay consistent for 90 days

Vitamin D status takes 8-12 weeks to stabilize. Ask your doctor for a 25-hydroxy D blood test before you start and again at month three to see your number move.
3

Subscribe every two months

Each bottle is a 60-day supply, so delivery lines up neatly with refills. Free shipping on orders $40+.

Full transparency

What's inside - and nothing more.

Just D3 and K2, suspended in organic olive oil for absorption. No proprietary blends, no synthetic K2 forms, no dyes. Every ingredient and dose listed on the label, exactly as you'll find it in your bottle.

Non-GMOGluten-freeNo artificial dyesThird-party tested
COMMON QUESTIONS

About D3 + K2

Have a question about your dose, blood-test results, or a medication interaction? Our team is available by email and usually responds within a few hours.
Contact our team →
They depend on each other. D3 increases calcium absorption from the gut; K2 activates the proteins that put that calcium into bone (and keep it out of arteries). High-dose D3 without K2 can mean more circulating calcium with nowhere productive to go. The two work as a pair.
5,000 IU of Vitamin D3 is a commonly recommended dose for adults, especially for those with limited sun exposure. It supports optimal calcium absorption and overall bone health when taken as directed.
Vitamin K2 can affect blood clotting, so if you take warfarin or other blood thinners, consult your healthcare provider before using this supplement.
Vitamin D3 + K2 works to support long-term bone and cardiovascular health. While effects may vary, consistent daily use over several weeks or months helps maintain optimal nutrient levels and overall wellness.
Softgels are easier to swallow and allow the fat-soluble vitamins D3 and K2 to be absorbed more efficiently, giving you better support from each dose.

The cornerstone of healthy aging, in one softgel.

D3 unlocks the calcium. K2 puts it where it belongs. Start the simplest pair of supplements with the longest track record - dosed the way the research actually runs.
SHOP D3 + K2 BUILD A MONTHLY PLAN