21st Century Calcium Citrate Plus D3 Maximum Tablets
- Form: Tablet
- Supplement Type: Calcium
- Diet: Gluten Free
- Allergens: Gluten Free
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A straightforward calcium citrate plus D3 tablet built as a direct alternative to Citracal +D3, with a 400-count bottle for long-term use.
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ASIN: B00F4BV5DQCategory: Calcium Supplements
Overview
21st Century's Calcium Citrate Plus D3 Maximum delivers 630 mg of calcium per serving in citrate form, positioned as a gluten free, non-GMO alternative to Citracal +D3. Each bottle holds 400 tablets, a supply built for daily long-term use.
Calcium citrate is the form the label leans on, and the product is marketed explicitly as a swap for a well known brand name rather than a novel formula. With 400 tablets in one bottle, the count matters as much as the dose for anyone comparing cost per serving.
- 630 mg calcium per serving
- Calcium citrate form
- 400 tablets per bottle
- Gluten free, non-GMO
Who it's for
Suits shoppers already taking a calcium plus D3 tablet who want a gluten free, non-GMO version at a lower price than the brand it's compared against. Not aimed at anyone needing a liquid, gummy, or once-a-day mega-dose format.
Pros and cons
- 630 mg calcium citrate per serving
- 400-tablet bottle for extended use
- Gluten free and non-GMO
- Tablet form only, no gummy or liquid option
- Flavor and dosing schedule not detailed
Performance notes
Calcium citrate is the form used here rather than calcium carbonate, which the brand frames as easily absorbable. The 630 mg per serving figure and the tablet form are the two facts the label leads with; the rest of the dosing schedule is not specified in the listing.
Specifications
| Brand | 21st Century |
|---|---|
| Form | Tablet |
| Supplement Type | Calcium |
| Diet | Gluten Free |
| Allergens | Gluten Free |
| Count | 400 |
| Flavor | Unflavored |
| Benefits | Bone Strength |
Frequently asked questions
What form of calcium is in 21st Century Calcium Citrate Plus D3 Maximum?
It uses calcium citrate, delivering 630 mg of calcium per serving alongside vitamin D3, in tablet form.
How many tablets come in the bottle?
The bottle contains 400 tablets.
Is this product gluten free?
Yes, it's labeled gluten free and non-GMO.