Life Extension Super K Vitamin K1 and K2 90 Softgels
- 1500 mcg vitamin K1
- 1000 mcg K2 as MK-4, 100 mcg K2 as MK-7
- 2600 mcg total vitamin K activity
- 1 softgel daily, 90 softgels
- Gluten free, non-GMO
- Certificate of Analysis available
Last refreshed Sep 11, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A high-potency, once-daily vitamin K formula with three forms for heart and bone support. Its doses are high, so anyone on medication should check with a doctor first.
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ASIN: B07RL1J9BVCategory: Vitamin K1 Supplements
Overview
Taking one softgel a day covers three forms of vitamin K in this Life Extension formula, which aims to support arterial health and calcium balance. It combines plant-form vitamin K with two menaquinone forms.
Three forms of vitamin K in a single daily softgel simplify a heart and bone routine. The doses are large, and interactions with medication are not covered in the listing.
Who it's for
Adults focused on bone and arterial health get a once-daily, multi-form vitamin K. People on prescription medication should ask their doctor before starting.
Pros and cons
- Three forms of vitamin K
- Gluten free and non-GMO
- Certificate of Analysis available
- High dose may not suit everyone
- Medication interactions not covered
- Softgel, not chewable
Performance notes
Vitamin K helps direct calcium into bone, which is the basis for the calcium balance claim. The menaquinone forms differ in how long they stay in the body, which is why the formula mixes them. Daily use over time is what the maker describes.
Specifications
| Brand | Life Extension |
|---|---|
| Dimensions & fit | |
| Item weight | 2.08 ounces |
| Item Dimensions | 1.86 x 1.86 x 3.41 inches |
| Capacity & performance | |
| Age Range Description | Adult |
| Construction & materials | |
| Color | Brown |
| Included components | |
| Unit Count | 90 softgels |
| Other details | |
| Diet Type | Gluten free, non-GMO |
| Vitamin k1 | 1500 mcg |
| Item Form | Softgel |
| Vitamin k2 mk4 | 1000 mcg |
| Vitamin k2 mk7 | 100 mcg |
| Total vitamin k | 2600 mcg |
| Serving | 1 softgel daily |
| Container Type | Bottle |
| Dose Release Method | Osmotic Release |
| Flavor | Unflavored |
| Item Nype Name | Super K |
| Primary Supplement Type | Vitamin K |
| Specific Uses For Product | Bone Health, Heart |
| Supplement Formulation | Multi-Supplement |
Frequently asked questions
Can I take Life Extension Super K with prescription medication?
The listing does not cover medication interactions. Ask your doctor before combining a vitamin K supplement with any prescription.
How much vitamin K is in Life Extension Super K?
1500 mcg of K1, 1000 mcg of K2 as MK-4 and 100 mcg of K2 as MK-7, for 2600 mcg total vitamin K activity.
How long does a bottle of Super K last?
90 softgels at 1 daily, a 3-month supply.