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Nutrients · 4 min read · October 21, 2026

Calcium, D3 and K2: the bone trio, explained simply

Why these three nutrients show up together — and what each one actually does.

If you read supplement labels for kids and teens, you will see calcium, vitamin D3 and vitamin K2 together again and again. There is a good reason: they work as a team.

Calcium: the building block

Calcium is a key building block of healthy bones and teeth.* The growing years are when the body builds most of its bone, so daily calcium intake matters.

Vitamin D3: the helper

Vitamin D3 helps the body absorb calcium from food.* The body makes it in sunlight, and only a few foods contain much of it.

Vitamin K2: the director

Vitamin K2 works with D3 and helps direct calcium toward the bones.*

Growth & Development Capsules

Ages 9+ · 3 capsules a day

Growth & Development Capsules

416 mg calcium, 1,000 IU D3, K2 (MK-4 & MK-7) and magnesium glycinate — every amount on the label.*

★★★★★★★★★★4.2 · 759 ratings

Food comes first: milk, yogurt, cheese, fortified plant drinks, eggs and leafy greens. Ask your pediatrician whether your child needs a supplement on top.

By the SilverPeaks team. This article is for general information and is not medical advice. Ask your pediatrician before giving any supplement to a child. *These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

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