# Life Extension Super K review: current formula, versions and warfarin Canonical: https://supplementexplained.com/products/life-extension-super-k-90-softgels/ Last modified: 2026-10-15T07:40:39+00:00 Publisher: Supplement Explained Review model: Editorial review; medical review only when explicitly documented on the canonical page. Life Extension Super K is a high-strength option for someone specifically seeking vitamin K1 plus both MK-4 and MK-7 forms of K2. Check the version before buying: [Life Extension's current label](https://www.lifeextension.com/vitamins-supplements/item02334/super-k) lists 3,180 mcg of vitamin K per softgel, while [HerbsPro's listing](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r02-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Fsuper-k-with-advanced-k2-complex-109060) shows an older 2,600 mcg formula. Confirm the actual bottle label rather than relying on the product name. If you take warfarin or a similar vitamin K antagonist, speak with your prescriber before starting, stopping or changing Super K. [Vitamin K can interact dangerously with these medicines](https://ods.od.nih.gov/factsheets/VitaminK-HealthProfessional/), so keeping intake consistent matters; this is not a blanket ban on foods containing vitamin K. No upper intake limit has been established for vitamin K, but that does not make a high-strength supplement suitable for everyone. [Life Extension products and brand analysis](https://supplementexplained.com/brands/life-extension/) ![Life Extension Super K, 90 softgels; current manufacturer 3,180 mcg vitamin K](https://supplementexplained.com/wp-content/uploads/2026/10/se-backlog-r02.webp) ## Life Extension Super K Review the exact formula and label limits before ordering. [Check price at HerbsPro](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r02-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Fsuper-k-with-advanced-k2-complex-109060) Affiliate link: we may earn a commission if you buy. **On this page** 1. [Current formula vs. the older seller label](https://supplementexplained.com/products/life-extension-super-k-90-softgels/#current-formula-vs-older-label) 2. [Vitamin K benefits and limits](https://supplementexplained.com/products/life-extension-super-k-90-softgels/#vitamin-k-benefits-and-limits) 3. [What is known about independent testing?](https://supplementexplained.com/products/life-extension-super-k-90-softgels/#independent-testing) 4. [Price per labeled serving](https://supplementexplained.com/products/life-extension-super-k-90-softgels/#price-per-labeled-serving) ## Current formula vs. the older seller label As of October 15, 2026, [Life Extension's US label](https://www.lifeextension.com/vitamins-supplements/item02334/super-k) and [HerbsPro's listing](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r02-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Fsuper-k-with-advanced-k2-complex-109060) showed these different amounts for the 90-softgel product: | Form | Current manufacturer label, per softgel | Older HerbsPro label, per softgel | | --- | --- | --- | | Vitamin K1 | 2,000 mcg | 1,500 mcg | | Vitamin K2 as MK-4 | 1,000 mcg | 1,000 mcg | | Vitamin K2 as MK-7 | 180 mcg | 100 mcg | | Total vitamin K | 3,180 mcg | 2,600 mcg | The HerbsPro listing matches the 90-softgel product and UPC 737870233435, but the shared UPC does not confirm which formula will ship. Ask the seller to confirm the Supplement Facts panel on the actual bottle before ordering. The current manufacturer label also lists 10 mg of vitamin C as ascorbyl palmitate. Other ingredients include gelatin and beeswax, so this product is not vegan. The manufacturer's directions are one softgel daily with a meal; those directions do not establish that you need this amount. ## Vitamin K benefits and limits [Vitamin K supports normal blood clotting and bone-related proteins](https://ods.od.nih.gov/factsheets/VitaminK-HealthProfessional/). Combining K1, MK-4 and MK-7 does not mean three times the benefit, and a higher total amount does not establish better results. The evidence does not establish that this retail blend prevents fractures or reverses arterial calcification, meaning calcium buildup in arteries. If you want MK-7 alone or a lower vitamin K amount, a different formula fits that goal more closely. That is a difference in formulation, not proof that either option is clinically superior. Taking vitamin D does not automatically mean you need a vitamin K supplement or this high-strength blend. Our [vitamin D alone vs. D3 plus K2 comparison](https://supplementexplained.com/compare/vitamin-d-alone-vs-d3-k2/) addresses that separate decision. ## What is known about independent testing? No independent laboratory report for a finished lot of this exact Super K formula was verified for this review. That does not establish that the product failed testing. ConsumerLab results for other Life Extension formulas do not verify this product. Our [Life Extension brand guide](https://supplementexplained.com/brands/life-extension/) explains why quality needs to be assessed product by product. ## Price per labeled serving On October 15, 2026, [HerbsPro listed the 90-softgel bottle at $24](https://www.anrdoezrs.net/click-101886474-15733504?sid=se-r02-20261015&url=https%3A%2F%2Fwww.herbspro.com%2Fproducts%2Fsuper-k-with-advanced-k2-complex-109060) before tax and shipping. At one softgel per labeled serving, $24 divided by 90 is about $0.267 per serving, or 27 cents. This measures cost per serving, not health benefit per dollar. The price belongs to the listing showing the older formula, not a confirmed shipment of the current 3,180 mcg version. ## Sources - [Manufacturer label and ingredient information](https://www.lifeextension.com/vitamins-supplements/item02334/super-k) - [HerbsPro product listing (checked October 15, 2026)](https://www.herbspro.com/products/super-k-with-advanced-k2-complex-109060) - [NIH vitamin K evidence and interactions](https://ods.od.nih.gov/factsheets/VitaminK-HealthProfessional/) Sources and labels checked October 15, 2026. [How we review](https://supplementexplained.com/how-we-review-evidence/). General information, not personal medical advice. Our editorial assessment ## Supplement Explained Score **56**/100 90 softgels; current manufacturer 3,180 mcg vitamin K Five equally weighted criteria. This is an editorial assessment, not customer stars, a clinical ranking or a measure of medical effectiveness. **Label clarity **3/5**** The current manufacturer lists all three forms and other ingredients, but the same-UPC seller table shows an older 2,600 mcg total. Shipped formula is not confirmed. **Research relevance **3/5**** Vitamin K has established nutrient roles. Evidence does not establish that this high-strength three-form retail blend prevents fractures or reverses arterial calcification. **Safety and cautions **3/5**** Vitamin K antagonists such as warfarin create a serious interaction context. High strength and gelatin/beeswax also restrict who should choose this formula. **Testing and quality checks **2/5**** No independently verified finished-lot potency and contaminant report was found for this exact Super K variant. Reports about other Life Extension formulas do not transfer. **Value for money **3/5**** The $24/90 offer is about $0.267 per labeled serving, but its formula-version uncertainty and broad high-strength blend prevent a straightforward value recommendation. Based on published information, not personal use or laboratory testing by us. Missing testing documentation is not evidence of contamination. Where label versions remain unresolved, the points reflect that limitation rather than assuming a complete current formula. Reviewed 2026-10-15 · Method v2.0 · [How we assign points](https://supplementexplained.com/quality/supplement-explained-score/) **Sources behind this score** - [www.lifeextension.com](https://www.lifeextension.com/vitamins-supplements/item02334/super-k) - [www.herbspro.com](https://www.herbspro.com/products/super-k-with-advanced-k2-complex-109060) - [ods.od.nih.gov](https://ods.od.nih.gov/factsheets/VitaminK-HealthProfessional/)