Which Vitamin K2 Supplement is Best – MK-4 or MK-7?

by Sarah Healthy LivingComments: 145

Vitamin K2Getting enough Vitamin K2 is absolutely essential to vibrant health and the vast majority of people, even those eating a completely whole food, organic diet, fail miserably in getting enough.

Traditional Societies instinctively put great importance on foods high in Vitamin K2. These sacred foods were consumed in larger quantities by young couples preparing to conceive, pregnant and breastfeeding women, growing children, and the elderly in order to ensure health during these critical times of life.

Sufficient Vitamin K2 along with the other critical fat soluble activators A and D are especially important for pregnant women to consume to ensure healthy babies. Please note that Vitamin K1 from leafy greens is a different nutrient and is not the same as Vitamin K2 found in the sacred foods of traditional cultures.

The best food sources of Vitamin K2 are grassfed dairy products and natto, a very strong tasting fermented soy product with roots in Japan. Vitamin K2 from animal sources is known as MK-4 while Vitamin K2 produced by bacterial fermentation as found in natto is known as MK-7.

Getting Enough Vitamin K2 is Difficult Even With Grassfed Dairy

Unfortunately, even if one consumes plenty of grassfed dairy, getting enough K2 in the diet is still very much a challenge.  This is due to the worrisome depletion of our soils which will take generations to repair.

Consider that the spring butter of the Alpine living Swiss was an orange color whereas grassfed spring butter today is at best deep yellow.   No doubt, the soil that produced the rapidly growing spring grass that the Alpine cows grazed upon was much higher in nutrients in order to produce orange butter which the Swiss reverently placed in bowls with wicks to burn in their Churches .

It also greatly concerning that Vitamin K2 cannot be recycled by the body like Vitamin K1 and that stores can be quickly depleted with the very common and invisible deficiency of K2 occurring in as little as 7 days.

In order to bridge the gap and ensure that my family gets enough Vitamin K2, I decided about a year ago that we needed to take a daily supplement as I was not confident that we were getting enough even with our frequent consumption of sacred foods and grassfed dairy.

Does this mean that grassfed dairy is not important?  Absolutely not.   It is always best to strive to get your nutrients from food as much as possible.  With the depletion of the soils, however, I did not feel certain that we could get enough K2 eating reasonable amounts of whole and even sacred foods from grassfed sources like Traditional Societies would have eating a similar diet.

I have not yet seen any scientific studies confirming which specific daily dose of K2 is optimal for long term health, however, based on population studies and data obtained from Vitamin K2 doses given in clinical trials, it seems that 45 mcg/day would be the minimal dose for therapeutic effect with several hundred mcg/day a better target as this is what frequent natto eaters in Japan would be consuming.

The good news is that Vitamin K2 has no known toxicity, so adding a daily supplement taken with food to improve absorption really has no downside.

Why I Take Vitamin K2 as MK-7 and Not MK-4

If you decide that taking a Vitamin K2 supplement makes sense to you, which should you choose?

If given the choice, I prefer MK-4, the animal form of Vitamin K2 over MK-7 which is the form of K2 from bacterial fermentation.

However, the problem is that while MK-4 in food like grassfed butter, high vitamin butter oil, and pastured egg yolks is real and ideal, the MK-4 contained in supplements is synthetic.

Let me say that again. The MK-4 in supplements is not the same MK-4 as found in grassfed butter.  The MK-4 in supplements is not derived from grassfed dairy as this would be prohibitively expensive.  Rather, it is made from the extract of the tobacco plant.

Another big downside of MK-4 supplements is that this synthetic form of MK-4 does not remain in therapeutic levels in the blood for very long – only a few hours.  As a result, to maintain useful levels of synthetic MK-4 in the blood throughout the day, periodic dosing every few hours is required.

Consequently, I take a Vitamin K2 supplement derived from natto (nonGMO soybeans) instead, which is the form of Vitamin K2 known as MK-7 as this is the same K2 you would get if you actually ate natto, which most folks find highly unpalatable.

Another plus is that MK-7 stays in therapeutic doses in the blood much longer than synthetic MK-4.   As a result, a once a day supplement of MK-7 is sufficient to supplement the natural MK-4 that one is getting from a diet high in grassfed dairy and other sacred foods.

Source for This Article

If this article piques your interest in Vitamin K2 and why we so desperately need it in our diets, I highly recommend reading the book Vitamin K2 and the Calcium Paradox by Dr. Kate Rheaume-Bleue BSc, ND from which the information for this article was derived.

More Information in Vitamin K2

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Why I Gorged on Brie Cheese When I Was Pregnant

Emu Oil: Aboriginal Sacred Food High in Vitamin K2


Sarah, The Healthy Home Economist

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