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MINERALS
Calcium (hydroxyapatite)
Microcrystalline hydroxyapatite provides calcium and phosphorus in the form found in bone to support skeletal strength.
Also known as: calcium supplement, microcrystalline hydroxyapatite, MCHC, Calcium hydroxyapatite
At a glance
- Form
- Calcium hydroxyapatite
- Category
- Minerals
- In an apiece formula
- 200 mg a day (you can change it)
- Recommended intake
- 1,000 mg; 1,200 mg for women over 50
- Upper limit
- 2,500 mg a day (ages 19–50); 2,000 mg (51+)
- Reference
- NIH ODS: Calcium fact sheet
Who should be careful
Our safety rules leave calcium out of a formula, or keep the amount lower, with:
Kept to a lower amount with
- Thiazide water pill
- Calcium oxalate kidney stones more than once, or primary hyperoxaluria
- Kidney stones
Medicines and supplements
- Phosphate binder
- Active vitamin D
Procedures
- Dialysis
Health conditions
- Advanced kidney disease
- High calcium or hyperparathyroidism
- Sarcoidosis or another granulomatous disease
Life stage
- Pregnancy
- Breastfeeding
- Trying to conceive
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Other forms of calcium
- Calcium bisglycinate chelate
Calcium bisglycinate is a gentle-on-the-stomach form of calcium that supports strong bones and teeth.
- Calcium citrate
Calcium citrate is a well-absorbed form of calcium that supports strong bones and teeth.
Questions
How much calcium a day?
apiece formulas usually include 200 mg a day. The recommended intake for adults is 1,000 mg; 1,200 mg for women over 50. Upper limit: 2,500 mg a day (ages 19–50); 2,000 mg (51+).
What is calcium used for?
Microcrystalline hydroxyapatite provides calcium and phosphorus in the form found in bone to support skeletal strength.*
Who should be careful with calcium?
apiece’s safety rules leave it out or limit it with: Thiazide water pill; Calcium oxalate kidney stones more than once, or primary hyperoxaluria; Kidney stones; Phosphate binder; Active vitamin D; Dialysis; Advanced kidney disease; High calcium or hyperparathyroidism; Sarcoidosis or another granulomatous disease; Pregnancy and others. Check with your doctor or pharmacist if any apply to you.
Can I get calcium in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. Calcium can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.