INGREDIENTS
Calcium: every form, compared
How the forms of calcium differ, and how much to take.
apiece offers 3 forms of calcium. Each is listed with the amount a formula usually includes.
- Calcium bisglycinate chelate
Calcium bisglycinate is a gentle-on-the-stomach form of calcium that supports strong bones and teeth. Usual amount: 200 mg.
- Calcium citrate
Calcium citrate is a well-absorbed form of calcium that supports strong bones and teeth. Usual amount: 200 mg.
- Calcium hydroxyapatite
Microcrystalline hydroxyapatite provides calcium and phosphorus in the form found in bone to support skeletal strength. Usual amount: 200 mg.
- 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
Questions
Which form of calcium is best?
It depends on what you want it for and how your body handles it. The forms differ in how much calcium they carry, how they feel on the stomach and how much capsule space they take. apiece uses calcium bisglycinate chelate by default and lets you choose another form.
How much calcium is too much?
The adult upper limit is 2,500 mg a day (ages 19–50); 2,000 mg (51+). Count every source, including multivitamins.
*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.