Nature's Bounty Calcium Carbonate & Vitamin D
- Calcium
- Tablet
- Calcium
- 250
- Better rated than 63%
- More reviewed than 85%
A large-format calcium and vitamin D3 tablet for anyone maintaining a daily bone-health routine and wanting to avoid reordering often.
As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.
How it ranks among the 107 calcium we track
4.7★ across 8,200 Amazon ratings, Bayesian-smoothed toward the category average.
8,200 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
10,000+ 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 Nature's Bounty formula combines 600 mg of calcium carbonate with 800 IU of vitamin D3 in a single tablet, pairing the two nutrients that work together for bone health rather than requiring two separate pills.
The 250-tablet count is a large bottle, suited to a long daily routine rather than a trial size. It carries a gluten-free listing, and the calcium and vitamin D3 combination reflects the established relationship between the two nutrients rather than added extras.
- 600 mg calcium carbonate per serving
- 800 IU vitamin D3 for absorption support
- 250 tablets per bottle
- Gluten free
Who it's for
Anyone building a daily calcium and vitamin D routine for bone health who wants both nutrients in one tablet and prefers a large bottle to avoid reordering often. Less suited to someone advised to use calcium citrate instead of carbonate.
Strengths and trade-offs
Drawn from this product's published specifications.
- 600 mg calcium plus 800 IU vitamin D3 in one tablet
- Large 250-tablet count reduces reordering
- Calcium carbonate is best absorbed with food, unlike calcium citrate
- Tablet form may be harder to swallow than a softgel for some users
Performance notes
Vitamin D3 supports the body's absorption of calcium, which is why the two are commonly combined in one tablet rather than sold separately. Calcium carbonate, the form used here, is generally best absorbed when taken with food.
Specifications
| Brand | Nature's |
|---|---|
| Model | 4233 |
| Form | Tablet |
| Supplement Type | Calcium |
| Count | 250 |
| Benefits | Bone & Joint Support, Immune Support |
| Flavor | Unflavored |
| Diet | Gluten Free |
| Allergens | Sulphur Dioxide |
Other Nature's calcium
How it compares
This product against the closest alternatives we track in calcium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Nature's Bounty Calcium Carbonate & Vitamin DThis product | 4.7 / 5 | 8,200 | 4.7 / 5 |
| Nature Made Calcium Magnesium Zinc with Vitamin D3NATURE | 4.8 / 5 | 19,900 | 4.7 / 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 |
| NATURELO Calcium SupplementNATURELO | 4.6 / 5 | 11,000 | 4.6 / 5 |
Similar calcium from other brands
Questions about the Nature's 4233
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How much calcium and vitamin D does each serving provide?
The formula provides 600 mg of calcium carbonate and 800 IU of vitamin D3.
How many tablets come in the bottle?
The bottle contains 250 tablets.
Is this formula gluten free?
Yes, it is listed as gluten free.