Calcium: study protocols
232 study groups say how much Calcium participants took a day. These are the doses the studies gave. They are not a recommendation.
Dose per serving from products
26,786 products in our catalogue print how much Calcium a serving holds.
Most common: 100 mg to 250 mg, 27% of 26,786 products.
| Dose per serving | Products |
|---|---|
| 5 mg or less | 1,257 |
| 5 mg to 10 mg | 1,063 |
| 10 mg to 25 mg | 2,684 |
| 25 mg to 50 mg | 5,212 |
| 50 mg to 100 mg | 5,110 |
| 100 mg to 250 mg | 7,287 |
| 250 mg to 500 mg | 2,488 |
| 500 mg to 1 g | 1,374 |
| over 1 g | 311 |
Dose per serving from research
229 study groups in 135 studies say how much Calcium participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 500 mg to 1 g, 40% of 229 study groups.
| Daily dose | Study groups |
|---|---|
| 250 mg or less | 11 |
| 250 mg to 500 mg | 50 |
| 500 mg to 1 g | 91 |
| 1 g to 2.5 g | 70 |
| over 2.5 g | 7 |
Commonly used together
133 of 232 study groups took Calcium with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Vitamin D | 113 |
| Iron | 9 |
| Folic Acid | 8 |
| Vitamin D3 | 8 |
232 study groups
| Study | |||
|---|---|---|---|
| Apparent efficacy of food-based calcium supplementation in preventing rickets in Bangladesh 2008 · 250 mg Ca · Children aged 1–5 years without rickets and in the upper decile of plasma alkaline phosphatase activity in a rickets-endemic area of Bangladesh | 250 mg | 390 days | — |
| Calcium supplementation during pregnancy for reducing pregnancy induced hypertension 1995 · 120 mg calcium group · Healthy primipara pregnant women | 120 mg | — | — |
| Calcium supplementation during pregnancy for reducing pregnancy induced hypertension 1995 · 240 mg calcium group · Healthy primipara pregnant women | 240 mg | — | — |
| Apparent efficacy of food-based calcium supplementation in preventing rickets in Bangladesh 2008 · 50 mg Ca · Children aged 1–5 years without rickets and in the upper decile of plasma alkaline phosphatase activity in a rickets-endemic area of Bangladesh | 50 mg | 390 days | — |
| Apparent efficacy of food-based calcium supplementation in preventing rickets in Bangladesh 2008 · 500 mg Ca · Children aged 1–5 years without rickets and in the upper decile of plasma alkaline phosphatase activity in a rickets-endemic area of Bangladesh | 500 mg | 390 days | — |
| Two Randomized Trials of Low-Dose Calcium Supplementation in Pregnancy 2024 · Tanzania trial, 500-mg group · Adults aged 18 years or older who were nulliparous and pregnant at less than 20 weeks’ gestation | 500 mg | — | — |
| Calcium supplementation to prevent hypertensive disorders of pregnancy 1991 · calcium group · Nulliparous pregnant women in the 20th week of gestation | 2 g | — | 593 |
| Effect of calcium supplementation on fracture risk: a double-blind randomized controlled trial 2008 · calcium group · Adults aged 27–80 with a previously removed large-bowel adenoma; generally healthy men and women | 1.2 g | 4 years | 464 |
| Calcium and vitamin D supplementation and increased risk of serrated polyps: results from a randomised clinical trial 2019 · calcium alone · Adults aged 45–75 with at least one adenomatous polyp detected and removed within the preceding 4 months | 1.2 g | 5 years | 419 |
| Calcium supplementation and the risk of preeclampsia in Ecuadorian pregnant teenagers 1997 · calcium treatment group · Pregnant teenagers younger than 17.5 years, nulliparous, with first prenatal visit before 20 weeks' gestation | 2 g | — | 125 |