21st Century Slow Release Iron Tablets
- Iron
- Tablet
- Magnesium
- 60
- More reviewed than 92%
A gluten free, slow release iron tablet in a 60-count bottle, best suited to buyers who already know they want gradual release over a fast-acting dose.
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How it ranks among the 59 iron we track
4.6★ across 14,897 Amazon ratings, Bayesian-smoothed toward the category average.
14,897 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 59 iron we track - how the scorecard works · full iron data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
21st Century's slow release iron tablet comes in a 60-count bottle, formulated gluten free for buyers tracking iron intake without a fast-release spike.
Slow release tablets are built to release their dose gradually rather than all at once, the main functional difference from a standard iron tablet. The data doesn't list a milligram strength, so buyers who need a specific iron dose should confirm the label before ordering. No vitamin C pairing, often used to aid iron absorption, is indicated here.
- Slow release delivery
- 60 tablets per bottle
- Gluten free formulation
- Tablet form
Who it's for
Fits buyers who specifically want a slow release iron tablet rather than a standard fast-release version. Not the right pick if you need a documented milligram strength before purchase, since that isn't listed here.
Strengths and trade-offs
Drawn from this product's published specifications.
- Slow release format
- Gluten free formulation
- No milligram strength listed
- No vitamin C pairing indicated for absorption
Performance notes
Slow release tablets are designed to break down over a longer window than standard tablets, which can reduce the single-dose spike some people experience with fast-release iron. Gluten free is the only dietary claim listed. No iron strength in milligrams or vitamin C pairing is specified in this data.
Specifications
| Brand | 21st |
|---|---|
| Model | 27343 |
| Form | Tablet |
| Supplement Type | Magnesium |
| Count | 60 |
| Benefits | Iron Support |
| Flavor | Unflavored |
| Diet | Gluten Free |
| Allergens | Gluten Free |
How it compares
This product against the closest alternatives we track in iron.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| 21st Century Slow Release Iron TabletsThis product | 4.6 / 5 | 14,897 | 4.5 / 5 |
| Nature Made Iron 65 mgNATURE | 4.7 / 5 | 54,615 | 4.6 / 5 |
| Nature's Bounty Iron 65mgNature’s | 4.7 / 5 | 35,600 | 4.6 / 5 |
| Slow Fe 45mg Iron Supplement for Iron DeficiencySlow | 4.7 / 5 | 9,942 | 4.6 / 5 |
| Feosol Original Iron Supplement TabletsFeosol | 4.7 / 5 | 9,100 | 4.6 / 5 |
Similar iron from other brands
Questions about the 21st 27343
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How many tablets are in this iron supplement?
60 tablets.
Is it gluten free?
Yes, per the allergens and diet claims listed.
Is this a fast or slow release iron tablet?
It's formulated as a slow release tablet.