Life Extension Mega Vitamin K2 Review

Mega Vitamin K2 High Potency for Strong Bones is a gluten-free, non-GMO dietary supplement formulated by Life Extension to support healthy bone density and heart health. Each bottle contains 30 capsules, providing a 30-day supply when taken at the recommended dosage of one capsule daily with food. Every single-capsule serving delivers a strong, clinically studied 45,000 mcg (45 mg) dose of vitamin K2 in the specific form of menaquinone-4 (MK-4), alongside other ingredients including microcrystalline cellulose, a gelatin capsule, vegetable stearate, and silica. Vitamin K2 is essential for maintaining healthy bone mineral density because it encourages the cellular activity of osteoblasts, which are the specialized bone-building cells that regulate the mineralization of the lattice-like bone matrix support structure. Specifically, vitamin K acts as a vital cofactor for the carboxylation of osteocalcin, a protein produced by osteoblasts that is responsible for binding calcium and depositing it directly into the bone during the process of bone mineralization. Although the human body has a built-in process for maintaining healthy bone structure, this natural capability begins to decline over time with age. If an individual does not get enough vitamin K2, osteocalcin does not undergo carboxylation and instead remains in its inactive form, meaning it cannot bind to calcium or play its necessary role in bone formation. Clinical studies have demonstrated that the MK-4 form of vitamin K2 supports the biological processes that maintain bone mineral density in populations that need that support the most, such as postmenopausal women. Because this formula delivers a high potency of vitamin K, the manufacturer includes a caution advising anyone taking a vitamin K antagonist, such as a med, to consult their healthcare practitioner before taking this product, as well as standard warnings to consult a physician if pregnant, lactating, or undergoing treatment for a medical condition.

Product Focus: Bone HealthAlso covers:Muscles and jointsHeart
Tier ⓘ
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
Biohacker Mentions
Cost per month
$29

Study, Trial or Testing Result Summary

MembersHuman studies

This product provides 45,000 micrograms of vitamin K2 as menaquinone-4 per serving, which is the 90 microgram daily dose that showed in human trials. Out of 72 human studies on vitamin K2 for bone , 40 showed an and 13 showed . …

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Review Totals and Summary

Members2,705 reviews
2,705 reviews · IHerb 860 · Amazon 859 · Lifesourcevitamins 707 · Walmart 168 · Life Extension 104 · Ebay 7

This Life Extension Mega Vitamin K2 supplement has garnered approximately 1991 ratings across various stores, with a reception as of those ratings are 4 or 5 stars. Customers generally its potency and perceived effectiveness. **What it did for buyers** users incorporate this supplement into their routine primarily for bone and cardiovascular . …

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Biohacker Summary

MembersWhat our biohacker panel says

Vitamin D is the main ingredient here, and ten panelists spoke about it, with it or taking it themselves. They take it mainly for immune , brain and mood, muscle, and general or longevity, and say people are because they spend of their time indoors or live far from the sun. …

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RAL Summary

MembersThe tier and why

More Details

MembersBody systems · Combine with · Possible side effects

Body systems: Musculoskeletal system, Cardiovascular system. Combine with and possible side are for members.

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Supplement Facts

Vitamin K2 [as menaquinone-4 ] 45000 mcg
Supplement Facts
Serving Size 1 capsule
Servings Per Container none
Amount Per Serving% Daily Value
Vitamin K2 [as menaquinone-4 (45 mg)]45,000 mcg

Other ingredients: Microcrystalline cellulose, gelatin (capsule), vegetable stearate, silica.

Directions: Take one (1) capsule daily with food, or as recommended by a healthcare practitioner.

Label source: Lifeextension · Report a label change

Where to Buy

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Our articles on this subject

Graded October 28, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.