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156 total reviews

Regular price $50.00USD
Regular price Sale price $50.00USD


Called "Activator X" by Dr. Weston Price, Vitamin K2 is a fat soluble vitamin that supports healthy dental, bone, heart, nerve and brain health. It also supports healthy aging and energy production in the cell. K2 in the MK-7 form is largely missing in the modern diet due to the absence of traditional animal foods, especially aged cheeses. Purely K contains an optimal dose of K2 to support every tissue in the body. 


  • Supports bone health
  • Supports metabolism
  • Supports exercise performance
  • Supports ATP production
  • Support cardiovascular function
  • Supports brain function
  • Supports antioxidant defenses
  • Supports cellular signaling


  • Supports electron transport chain and oxidative phosphorylation (ATP production) 
  • Mitochondrial electron carrier - alternative electron acceptor/donor (complex I-III bypass) 
  • Protects from complex I-V inhibition 
  • Supplies complex III cofactors/substrates 
  • Protects from mitochondrial dysfunction 
  • Supports mitochondrial morphology 
  • Upregulates AMP-activated protein kinase (AMPK) signaling 

One of the primary roles of Vitamin K2 is to regulate calcium and guide it out of soft tissues like arteries to bones and teeth, where it should be. 

PURELY K is a synergistic blend of three forms of Vitamin K: 

  1. K1 or Phytomenadione

  2. K2 in MK-4 form called Menaquinone-4

  3. K2 in MK-7 form called Menaquinone-7

Each one has their strengths and weaknesses. Most vitamin K supplements will contain only K2, only in the MK-7 form, or in too small of amounts to have a substantial effect on the body. 

K1, or Phytomenadione, activates proteins in your blood that allow clots to form. When you see the green color in plants, you're seeing phytomenadione. It acts in plants like COQ10 does in humans to allow them to produce energy. It has a similar structure to ubiquinone. 

The RDA for K1 is 120 mcg for men and 90 mcg for women. We all know that the Recommended Daily Allowance (RDA) levels are set ridiculously low to support life but not robust health. One capsule of Purely K contains 500 mcg of K1.

K1 is especially important if one is on an animal-based diet and restricting vegetable consumption, which may be a good idea anyway with the rampant NPK fertilizer and tap water use. There is a very small amount in fruit but K1 is mainly present in green vegetables. 

While the body can recycle K1 and dietary deficiency is rare, conditions such as intestinal malabsorption or liver disease can inhibit the recycling process. Prolonged bleeding, nose bleeds, easy bruising bleeding gums and heavy menstrual periods are all symptoms of a K1 deficiency. 

Vitamin K1, sourced from evening primrose, is primarily included to support healthy blood clotting, which is useful if one is taking systemic enzymes or aspirin therapeutically. Both of those substances thin the blood so K1 from a good source is helpful to balance them. 

MK-4 is the form of K2 that we naturally receive from animal foods, namely grass-fed beef, butter and pastured egg yolks. The organ meat liver contains the highest source of MK-4. 

Purely K contains 2000 micrograms per serving. The amount used therapeutically in clinical studies is 4500 micrograms. If you consume a balanced diet that includes high quality animal foods, plus take two Purely K daily, it is easy to reach this number. Mammals can synthesize MK-4 from K-1. 

Intake of MK-4 has shown to be neuroprotective and help reduce the risk of prostate cancer.

Interstingly, MK-4 can also act as a pseudo-CoQ10 molecule. Helping with electron transport in the mitochondria and ultimately making energy for us!

MK-7 is the star of the show in Purely K. Exclusively found in fermented soy, or natto, and aged cheese, this crucial nutrient is severely deficient in the majority of the western population. 

While its primary role is to activate osteocalcin and matrix GLA protein to regulate calcium throughout your body, its benefits extend far beyond that. Dramatically reducing your risk for arthritis, osteoporosis and atherosclerosis is just the beginning! 

K2 MK-7 has been shown to prevent and reverse arterial blockages, prevent heart attacks, increase bone density, prevent diabetes, reduce insulin production, reduce the risk of Alzheimer's disease, prevent wrinkles, prevent varicose veins, and even increase energy production in the cells.

Vitamin K1 and K2 MK-4 have a shorter half life than K2 MK-7, meaning that with K2 MK-7, taking it on a regular basis will yield the best results.  


Take 1 capsule daily with a meal.

Note: Consider the suggested dose on the bottle a typo! Vitamin K2 MK-7 is very safe to supplement as supported by the clinical research

The median lethal dose (LD50) is north of 2000 mg per kg of bodyweight. That is 2,000,000 micrograms (mcg) per kilogram! This means that a person that weighs 150 lb would have to take 136,363,636 micrograms or 681,818 capsules of Purely K in one day to get up to a dangerous dose! You'd go broke first! Don't sweat and take your Purely K!

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Customer Reviews

Based on 156 reviews
Diego Cruz -Baker (San Diego, US)
Worth it

Highest dose I can find

Lindsey Biesel (Dallas, US)
Can't live without this!

Osteoporosis runs in the family and with unrelated ailments I correlated the vitamin deficiency and this is the only like kind product on the market. When it's been sold out I tried others and this is the only one out there. LOVE this product. Complete game changer

Stephanie M (Springfield, US)
Prevents arthritis in my hands

Mitolife is my most trusted supplement brand.
Purely K keeps the arthritic pain away from my hands.
I’m sure I’m experiencing other health benefits as well but this is a very noticeable effect. I like that it is healing instead of masking the problem. Highly recommend.

Zahra (Middlesbrough, GB)
Amazing. Highly recommend.

I never ever leave reviews. But this stuff is too good not to review. I've been using vit k for over a year. I love the energy boast it gives. My teeth feel much stronger and look it too. Joint pain has gone away. I just wish they would make this 60 capsules as before as it's costly to buy and then have shipped to the UK for the 30 capsule bottles. I run out so quickly.

Michael Maan (Surrey, CA)
Amazing !

This product is by far my favourite from Mitolife. It’s the one I can confidently say actually works. Second would be the systemic enzymes. The only downside is the cost, just really hard to afford it at $50 USD per bottle. (I’m from Canada so tack on an extra 30% in CAD funds. I can’t justify it unless it’s a BOGO.