English version in progress: interface and data are in English; some explanatory text is still in Chinese.
Calcium
小肠吸收钙需要维生素 D；体内 99% 的钙存在骨骼和牙齿里。
Full ranking Dose tool Products (6,925)
Key facts
Daily Value (US FDA)1,300 mg
Tolerable Upper Intake Level (UL)2,500 mg
Median（Per day）100 mgP5 11.9 – P95 667
Products6,925
Sources: https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/ · FDA DV 1300 mg (https://www.fda.gov/food/nutrition-facts-label/daily-value-nutrition-and-supplement-facts-labels); pre-2016 DV [1000] (https://www.federalregister.gov/documents/2016/05/27/2016-11867/food-labeling-revision-of-the-nutrition-and-supplement-facts-labels); adult UL 2500 mg; hard_high=5000 per serving (UL x10 or market maximum), hard_low=DV/1000
How it works：钙是怎么进骨头的？
- 钙在小肠吸收，主动吸收需要维生素 D。单次剂量不超过 500 mg 时吸收率最高。
- 约 1% 的钙在血液和细胞中，用于肌肉收缩、神经传导和血管功能。
- 其余 99% 储存在骨骼和牙齿中，并不断与血液交换。
Schematic only; positions and scale are not anatomical.
Limits and cautions：19–50 岁成人 UL 为 2,500 mg/天，51 岁以上为 2,000 mg/天。
Sources：NIH ODS: Calcium Fact Sheet for Health Professionals
Daily dose across products（mg/day）
DV 1,300
UL 2,500
4 mglog scale · n=6,9252,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common forms
| Form | Products | Median | P5–P95 | Elemental fraction |
|---|---|---|---|---|
| Calcium carbonate | 1888 | 200 mg | 20 – 1,000 | 40.0% [source] |
| Calcium citrate | 1026 | 145 mg | 17 – 600 | 21.1% [source] |
| Calcium phosphate | 746 | 100 mg | 22 – 500 | — |
| Calcium malate | 170 | 150 mg | 25 – 650 | — |
| Calcium lactate | 148 | 86.8 mg | 14.5 – 520 | 13.0% [source] |
| Calcium gluconate | 122 | 117 mg | 3.58 – 650 | 8.9% [source] |
| Calcium bisglycinate | 84 | 50 mg | 2 – 250 | — |
| Calcium hydroxyapatite | 53 | 220 mg | 3 – 1,000 | — |
| Calcium coral | 42 | 300 mg | 50 – 1,000 | — |
| Calcium algae | 38 | 75 mg | 25 – 1,000 | — |
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | XYMOGEN | ActivEssentials With Calcium | 2,300 mg | 87.0 |
| 2 | Nature's Bounty | Absorbable Calcium Plus Vitamin D3 | 1,200 mg | 86.9 |
| 2 | Vitamin World | Absorbable Calcium With Vitamin D3 | 1,200 mg | 86.9 |
| 2 | Vitamin World | Calcium 600 mg + Vitamin D3 | 1,200 mg | 86.9 |
| 2 | Vitamin World | Calcium Magnesium Citrate With Vitamin D3 Natural Strawberry Flavor | 1,200 mg | 86.9 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.