Life Extension Vitamins D and K with Sea-Iodine
- Vitamin D
- Capsule
- Vitamin-d
- 90
A combination capsule for people who want vitamin D, K and iodine covered together rather than sourced from separate bottles.
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How it ranks among the 137 vitamin d we track
4.7★ across 767 Amazon ratings, Bayesian-smoothed toward the category average.
767 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
1,000+ 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 137 vitamin d we track - how the scorecard works · full vitamin d 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
Life Extension pairs vitamin D with vitamin K and added sea-iodine in a 90 capsule bottle, an unflavored formula sold under the brand's Vitamin D supplement line.
Combining D and K reflects a common supplement pairing, since vitamin K is often discussed alongside vitamin D for how the body directs calcium, and Life Extension adds iodine sourced from sea minerals on top of that base pair rather than selling vitamin D alone. At 90 capsules per bottle, it runs roughly three months at one capsule daily.
- 90 capsules per bottle
- Vitamin D and K combined
- Added sea-iodine
- Unflavored
Who it's for
Suited to people who specifically want vitamin D and K combined in one capsule along with iodine, rather than three separate supplements. Not the product for someone who wants to control each nutrient's dose independently.
Strengths and trade-offs
Drawn from this product's published specifications.
- Combines vitamin D, K and iodine in one capsule
- 90 capsule bottle covers about three months at one a day
- Fixed combination doesn't allow adjusting each nutrient separately
- No flavor variety
Performance notes
The three way combination means each capsule delivers a fixed ratio of D, K and iodine rather than letting you adjust one nutrient without the others, which suits people happy with a standard bundled dose over those managing each nutrient separately.
Specifications
| Brand | Life |
|---|---|
| Form | Capsule |
| Supplement Type | Vitamin-d |
| Count | 90 |
| Flavor | Unflavored |
Other Life vitamin d
How it compares
This product against the closest alternatives we track in vitamin d.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Life Extension Vitamins D and K with Sea-IodineThis product | 4.7 / 5 | 767 | 4.4 / 5 |
| Nature's Bounty Vitamin D3 5000 IU SoftgelsNature's | 4.8 / 5 | 83,500 | 4.7 / 5 |
| Sports Research Vitamin D3 5000 IU with Coconut MCT OilSports | 4.8 / 5 | 71,400 | 4.7 / 5 |
| Nature Made Vitamin D3 5000 IUNATURE | 4.8 / 5 | 67,100 | 4.7 / 5 |
| vitafusion Vitamin D3 GummiesVitafusion | 4.8 / 5 | 54,500 | 4.7 / 5 |
Similar vitamin d from other brands
Questions about the Life vitamin d
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does this contain iodine?
Yes, it includes added sea-iodine alongside vitamin D and K.
How many capsules come in a bottle?
90 capsules.
Is this flavored?
No, it's unflavored.