4-in-1 Calcium 1200 mg with Vitamin D3 K2
- Calcium
- Tablet
- 120
- Extra Strength
- Better rated than 63%
A combined calcium, D3, and K2 tablet at a notably high 5,000 IU D3 dose, worth checking against any other D3 supplements before adding this one to a routine.
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How it ranks among the 107 calcium we track
4.7★ across 687 Amazon ratings, Bayesian-smoothed toward the category average.
687 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
2,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 107 calcium we track - how the scorecard works · full calcium data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This tablet combines 1,200 mg of calcium with 5,000 IU of vitamin D3 and K2 in a single 120 count bottle, framed as a four-nutrient formula for daily bone and general support.
Calcium, D3, and K2 are commonly paired because D3 supports calcium absorption and K2 is associated with directing calcium toward bone rather than soft tissue, a combination that has become a standard formulation pattern in this supplement category. At 5,000 IU, the D3 dose here is on the higher end compared with many standalone D3 products, which buyers already taking other D3 sources should factor in before stacking supplements. The formula is vegan-friendly, gluten free, and non-GMO, though the listing does not spell out what the fourth ingredient in the 4-in-1 name refers to beyond calcium, D3, and K2.
- 1,200 mg calcium per serving
- 5,000 IU vitamin D3 plus K2
- Vegan-friendly, gluten free, non-GMO
- 120 count bottle
Who it's for
Fits buyers who want calcium, D3, and K2 combined in one tablet rather than three separate bottles, particularly those already comfortable with higher D3 doses.
Strengths and trade-offs
Drawn from this product's published specifications.
- Combines calcium, D3, and K2 in one tablet
- 5,000 IU D3 dose
- Vegan-friendly, gluten free, non-GMO
- 120 count supply
- High D3 dose could add up if stacked with another D3 supplement
- Listing does not clarify what the fourth ingredient in the 4-in-1 name refers to
Performance notes
The combination works on the principle that D3 helps the body absorb calcium, while K2 is associated with directing that calcium toward bone rather than arteries or soft tissue, which is why the three are frequently bundled together in this category. The 5,000 IU D3 dose is notably higher than the amount found in many single-nutrient D3 products, so it functions as a stronger dose within this combined formula rather than a token addition.
Specifications
| Brand | 4-in-1 |
|---|---|
| Form | Tablet |
| Count | 120 |
| Flavor | Extra Strength |
Other 4-in-1 calcium
How it compares
This product against the closest alternatives we track in calcium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| 4-in-1 Calcium 1200 mg with Vitamin D3 K2This product | 4.7 / 5 | 687 | 4.4 / 5 |
| Nature Made Calcium Magnesium Zinc with Vitamin D3NATURE | 4.8 / 5 | 19,900 | 4.7 / 5 |
| Nature's Bounty Calcium Magnesium & Zinc CapletsNature's | 4.7 / 5 | 23,000 | 4.6 / 5 |
| Caltrate 600 Plus D3 Calcium and Vitamin D Supplement TabletsCaltrate | 4.7 / 5 | 16,400 | 4.6 / 5 |
| Citracal Slow Release- Calcium 1200 mg with Vitamin D3Citracal | 4.7 / 5 | 11,909 | 4.6 / 5 |
Similar calcium from other brands
Questions about the 4-in-1 calcium
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How much vitamin D3 is in this calcium supplement?
Each serving provides 5,000 IU of vitamin D3 alongside 1,200 mg of calcium and vitamin K2.
Is this calcium supplement vegan?
The listing describes it as vegan-friendly, gluten free, and non-GMO.
How many tablets come in the bottle?
The bottle contains 120 tablets.