21st Century Calcium Citrate Plus D3 Maximum Tablets
- 630 mg calcium with vitamin D3
- 400 tablets, unflavored
- Calcium citrate form, easily absorbable
- Gluten free, non-GMO
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A calcium citrate and D3 tablet in a very large bottle for bone health support. The listing does not say whether the calcium figure is per tablet or per serving.
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ASIN: B00F4BV5DQCategory: Calcium Supplements
Overview
Calcium citrate is the calcium form in these 21st Century tablets, paired with vitamin D3 for bone health. The listing describes it as easily absorbable and calls the strength maximum.
A big bottle and a calcium citrate base make this a long-term bone support product. Whether the calcium figure covers one tablet or a serving is the question the label has to answer.
Who it's for
Adults supporting bone health with a daily calcium and D3 tablet who value a big bottle. People who dislike swallowing tablets should look at chewables.
Pros and cons
- Calcium citrate form
- Vitamin D3 included
- Very large bottle count
- Gluten free and non-GMO
- Calcium basis unclear
- Directions not listed
- Tablet must be swallowed
Performance notes
Calcium citrate is chosen for absorption, and vitamin D3 helps the body use calcium. The calcium amount is tied to a serving that the listing does not define.
Specifications
| Brand | 21st Century |
|---|---|
| Form | Tablet |
| Supplement Type | Calcium citrate with vitamin D3 |
| Diet | Gluten free, non-GMO |
| Count | 400 tablets |
| Flavor | Unflavored |
| Benefits | Bone strength |
| Calcium per serving | 630 mg |
Frequently asked questions
Does 21st Century Calcium Citrate include vitamin D3?
Yes. The title says Plus D3, but it gives no D3 amount.
Is it a gummy?
No. It is an unflavored tablet.