VitalMatrix
Comparison

Vitamin D3 vs Vitamin K2

Both are commonly considered for bone health. Here is how they compare and how to choose.

By the Vital Matrix Editorial TeamReviewed by the Vital Matrix Research TeamLast updated June 25, 2026
Vitamin D3The sunshine vitamin behind bone, immune, and mood health.Vitamin K2The traffic controller that routes calcium to your bones.
Category
Vitamins
Vitamins
Evidence
Strong
Moderate
Best for
Bone health, Immunity, Mood
Bone health, Cardiovascular health
Top benefit
Supports bone density
Directs calcium to bone
Typical dose
1,000–4,000 IU per day for most adults
90–180 mcg per day (MK-7) or 45–90 mg per day (MK-4)
Timing
With a meal containing fat for best absorption
With a fat-containing meal, often alongside D3
Main caution
Hypercalcemia at high doses
Very well tolerated

How to choose

Choose Vitamin D3 if your focus is immunity and mood. Choose Vitamin K2 if you care more about cardiovascular health. Both are reasonable options for bone health.

Can you take them together?

Synergy: K2 directs the calcium that D3 helps absorb into bone rather than soft tissue and arteries.

See the full Vitamin D3 and Vitamin K2 pairing

Where to buy Vitamin D3 or Vitamin K2

Whichever you choose, pick a third-party-tested brand in the form each supplement's page recommends.

Some links below are affiliate links: if you buy through them we may earn a small commission at no extra cost to you. It never changes our ratings or evidence grades.

Frequently asked

What is the difference between Vitamin D3 and Vitamin K2?

Vitamin D3 is the sunshine vitamin behind bone, immune, and mood health. Vitamin K2 is the traffic controller that routes calcium to your bones.

Should I take Vitamin D3 or Vitamin K2?

Choose Vitamin D3 if your focus is immunity and mood. Choose Vitamin K2 if you care more about cardiovascular health. Both are reasonable options for bone health.

Can I take Vitamin D3 and Vitamin K2 together?

Synergy: K2 directs the calcium that D3 helps absorb into bone rather than soft tissue and arteries.

Vitamin D3 guide Vitamin K2 guide

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