ALGAECAL Organic Red Algae Calcium Supplement for Bone Density
- Calcium
- Capsule
- 120
- Unflavored
A layered calcium, D3, K2 and magnesium formula aimed at bone density, more involved than a plain calcium supplement but suited to buyers wanting that stack in one bottle.
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How it ranks among the 107 calcium we track
4.6★ across 1,800 Amazon ratings, Bayesian-smoothed toward the category average.
1,800 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
6,000+ 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
ALGAECAL's formula builds calcium from organic red algae and stacks it with vitamin K2 MK7 (100mg), vitamin D3 (1600 IU), magnesium (350mg) and trace minerals in 120 plant-based veggie capsules.
This goes beyond a plain calcium pill by combining nutrients that work in sequence for bone density and strength, rather than relying on calcium alone. Plant-based sourcing and veggie capsules make it usable for plant-based diets.
- Organic red algae calcium
- Vitamin K2 MK7 100mg
- Vitamin D3 1600 IU
- Magnesium 350mg, 120 veggie caps
Who it's for
Suits buyers who want a multi-nutrient bone density formula in one capsule instead of assembling calcium, D3, K2 and magnesium separately. Not for anyone who wants single-ingredient calcium or a lower-dose D3.
Strengths and trade-offs
Drawn from this product's published specifications.
- Combines calcium, D3, K2 and magnesium
- Plant-based sourcing in veggie capsules
- Marketed for bone density and strength
- More active ingredients to track for interactions with other supplements
- Higher combined dosing than a plain calcium pill
Performance notes
The ingredients play distinct roles: D3 helps the body absorb calcium, K2 MK7 helps direct that calcium toward bone rather than soft tissue, and magnesium acts as a cofactor for both, a layered approach different from a calcium-only pill.
Specifications
| Brand | ALGAECAL |
|---|---|
| Model | AP1 |
| Form | Capsule |
| Supplement Type | Calcium, Vitamin D3, Vitamin K2 |
| Count | 120 |
| Benefits | Bone & Joint Support, Bone Health, Bone Strength, Bone Density, General Health & |
| Flavor | Unflavored |
| Diet | Plant Based |
Other ALGAECAL calcium
How it compares
This product against the closest alternatives we track in calcium.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| ALGAECAL Organic Red Algae Calcium Supplement for Bone DensityThis product | 4.6 / 5 | 1,800 | 4.5 / 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 ALGAECAL AP1
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is the calcium source in ALGAECAL?
Organic red algae rather than rock or coral-derived calcium.
What else is in the formula besides calcium?
Vitamin K2 MK7 at 100mg, vitamin D3 at 1600 IU, magnesium at 350mg and trace minerals.
Are the capsules plant-based?
Yes, they are veggie capsules.