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MineralsModerate evidence

Bone support blend

Also known as: bone complex, calcium + magnesium + D + K

Bone complexes usually combine calcium, magnesium, vitamin D3, vitamin K2 and sometimes zinc, boron or manganese. The benefit depends on the doses of each ingredient on the label and on how much calcium and vitamin D you already get from food and sunlight.

What it is used for

  • maintenance of normal bones (calcium, vitamin D, magnesium, vitamin K) – strong evidence for the ingredients when deficient, EFSA-approved claims
  • slowing bone loss in older people (calcium + vitamin D) – moderate evidence
  • added boron or silicon – weak evidence

Forms and how they differ

calcium carbonate

a lot of calcium in a small volume, take with food

calcium citrate

absorbed even on an empty stomach, bulkier

vitamin D3 and K2 (MK-7)

check the µg per daily dose

magnesium and boron

doses in complexes tend to be low; quality depends on the label

When to take it

With food; split larger calcium doses into two portions during the day.

Pairs well with

Strength training and walking, enough protein, dairy or other dietary calcium sources.

Do not combine / separate

Keep at least 2–4 hours between calcium and iron, zinc, thyroid medicines, some antibiotics and bisphosphonates.

Watch out for

If you take warfarin or other blood thinners (vitamin K), have kidney stones, kidney disease, high blood calcium, or are pregnant, consult your doctor.

Safety

EFSA tolerable upper levels for adults: calcium 2,500 mg/day, vitamin D 100 µg/day, boron 10 mg/day, supplemental magnesium 250 mg/day – add up all sources; otherwise do not exceed the label dose.

Practical tip

If you already get enough calcium from food, look for a complex with less calcium and a focus on vitamins D and K2.

Products containing Bone support blend 1

Bone support blendblendBonesMuscles
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

Check Bone support blend with others

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Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.