Last updated: 17/10/2022

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Welcome to our big vitamin K test 2022. Here we present all the vitamin K supplements we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the internet. We would like to make your purchase decision easier and help you find the best vitamin K for you. You will also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos. Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy vitamin K.




Summary

  • Vitamin K belongs to the fat-soluble vitamins and is found in many foods, especially green vegetables.
  • It is important to distinguish between vitamin K1 and K2, both of which occur naturally.
  • Vitamin K is essential for blood clotting and also supports bone health.

The best vitamin k: Our Picks

Guide: Questions you should ask yourself before buying vitamin K

What is vitamin K and what can I take it for?

Vitamin K occurs naturally as vitamin K1 (phylloquinone) and K2 (menaquinone). Like vitamin A, D and E, it belongs to the fat-soluble vitamins and is mainly essential for blood clotting.

Vitamin K is essential for blood clotting. Otherwise we would bleed to death if we were injured. (Image source: pixabay.com / Arek Socha)

Vitamin K also supports bone mineralisation and thus inhibits bone loss in women after menopause. Furthermore, vitamin K prevents the deposition of calcium in soft tissues such as cartilage and blood vessels, regulates cell processes and repair processes in the nerve cells, kidneys, eyes, blood vessels and liver.

Did you know that the drug Marcumar, for example, acts as a vitamin K antagonist? Since vitamin K is responsible for blood clotting, such antagonists help, for example, in the aftercare of strokes or heart attacks by counteracting blood clotting and “thinning” the blood. This reduces the risk of thrombosis or blood clots.

How does vitamin K help me in connection with sports?

Vitamin K is often forgotten, but it is considered an all-round talent among vitamins. Since vitamin K plays a very important role in blood clotting, it ensures that we do not bleed to death when injured. It also ensures that calcium is transported to the bones and that the metabolism of connective tissue runs smoothly. When it comes to connective tissue, women in particular tend to take notice, as for many, body toning and anti-cellulite training are among the most important aspects of sport. It is also important to support the cardiovascular system by preventing calcium deposits in the arteries.

What foods contain vitamin K?

Vitamin K is mainly found in green vegetables such as spinach, Brussels sprouts and broccoli. Vitamin K is also found in algae and vegetable oils. These foods, which are commonly found in Germany, contain vitamin K1. Vitamin K2 can be better absorbed by the body, but it is hardly available in our western foods. Eggs, meat and dairy products contain at least small amounts. In the following table we have listed some foods and the amount of vitamin K they contain.

Food Vitamin K content in micrograms (per 100g)
Avocado 19
Cauliflower 5-300
Broccoli 99-205
Kale 817
Celeriac 41
lettuce 109
parsley 360-790
Brussels sprouts 177-570
chives 190-570
spinach 200-400
grapes 3-19
quark 40% fat i.Tr. 50
Herb cream cheese 40
Herring 25
Sprat 21
Pollock 1.6
Calf’s liver 89
Beef (muscle) 13
Rapeseed oil 150
Grape seed oil 280
Olive oil 33

How do I dose vitamin K and how do I take it?

According to the DGE (German Nutrition Society), the daily requirement of vitamin K for newborns is 4 micrograms per day; from the 4th month, the requirement increases to 10 micrograms. For adults and pregnant women, the daily requirement is 60-80 micrograms. As you can see in the table above, 50g of brussels sprouts or 150g of curd cheese per day would be sufficient for adults.

Vitamin K deficiency is relatively easy to prevent with a balanced diet.

In general, you probably take in as much as 300 or 400 micrograms in a day with your diet. However, 90 % of this is vitamin K1. An excess of vitamin K does not cause any damage or other consequences. Only in newborns, an excess of vitamin K can lead to the disintegration of red blood cells.

Are there any side effects related to vitamin K?

Neither in connection with the intake of vitamin K as a food supplement, nor in the form of food, have side effects occurred in humans and animals. Too much vitamin K should not be administered to newborns, as it can cause the red blood cells to disintegrate. However, there are some interactions with other medicines. These are as follows:

Drugs Effects Consequences
Anticoagulants Inhibit blood clotting Vitamin K reduces effect or cancels it completely
Antibiotics Can decimate vitamin-producing bacteria Can lead to vitamin K deficiency
Choletyramine Inhibit the absorption of cholesterol and fat-soluble vitamins May lead to vitamin K deficiency
Orlistat Drugs used to treat obesity inhibit the absorption of fat-soluble vitamins May lead to vitamin K deficiency

What does vitamin K cost?

Depending on the dosage, amount and composition or combination with other vitamins, you can get vitamin K from about 7 euros up to about 50 euros. Most products cost between 15 and 35 euros. Below we have clearly presented our price analysis with over 4000 products

Decision: What types of vitamin K are there and which is the right one for you?

What are the advantages and disadvantages of vitamin K1?

Vitamin K1 (phylloquinone) is indispensable for photosynthesis in plants and is therefore found in many vegetables and fruits. Especially green vegetables like kale, spinach or parsley contain a lot of vitamin K1. It ensures normal blood clotting, protects blood vessels and other soft tissues from calcium deposits and supports bones and teeth.

Advantages
  • Found in many foods
  • Essential for blood clotting
  • Supports bone mineralisation
  • Prevents deposits
Disadvantages
  • Less active form of vitamin K

What are the advantages and disadvantages of vitamin K2?

Vitamin K2 (menaquinone) is produced by bacteria such as E. coli. These bacteria are also found in the human intestine, so vitamin K2 can also be produced here in small quantities. Otherwise, we can also take it in small amounts via eggs, meat and dairy products.

Advantages
  • More active form of vitamin K
  • Essential for blood clotting
  • Supports bone mineralisation
  • Prevents deposits
Disadvantages
  • Very little present in western diet and food

Vitamin K2 is considered the more active form of vitamin K, but otherwise has the same effects as K1. Since there is very little K2 in our western foods, it makes sense to take K2 in addition via a food supplement.

What distinguishes vitamin K3?

Vitamin K3 is a synthetically produced form of vitamin K and is water-soluble. Since it is toxic in certain amounts, this form has been banned for human consumption for some time. Therefore, it is only mentioned here for a complete overview.

Buying criteria: You can use these factors to compare and evaluate vitamin K preparations

In the following, we will show you which aspects you can use to decide between the many possible vitamin K preparations. The criteria you can use to compare the preparations with each other include:

  • Dosage
  • Composition
  • Dosage form

Dosage

If you want to buy a vitamin K product, the dosage naturally plays a role. In most cases, as mentioned above, the daily requirement of K1 is covered by food.

However, most preparations are highly dosed anyway and are thus far higher than the daily requirement.

If you want to use vitamin K for adolescents or children, you should make sure that the dosage is not too high.

Composition

Many vitamin K supplements come in a combination of K1 and K2 or even with additional other vitamins and nutrients. However, there are also some that offer K2 alone, for example. Here you have to decide for yourself whether you want a combination or really just a K2 supplement. If you eat a very balanced, healthy diet rich in vitamins, a single product may be enough. However, make sure that your diet is not too low in fat, as vitamin K needs fats to be absorbed properly by the body.

Dosage form

Vitamin K is available in the form of tablets, capsules or drops. Theoretically, it doesn’t matter which form you choose, because it is much more about the content and the dose.

Vitamin K is available in the form of capsules or tablets, but also as drops. (Image source: pixabay.com / Steve Buissinne)

The advantage of capsules and drops, however, is that they already contain oil, which is useful for fat-soluble vitamins. So you can take them independently of meals. If you decide to take tablets, you can achieve the same effect by simply taking them with a meal (with fat).

Interesting facts about vitamin K

What are fat-soluble vitamins?

As mentioned above, vitamin K, like vitamins A, D and E, are fat-soluble vitamins. In contrast, there is the group of water-soluble vitamins. In comparison, the fat-soluble vitamins have the advantage that they can be stored in the body.

To remember the fat-soluble vitamins, the mnemonic with the name of a supermarket helps: “EDEKA” (E, D, K, A).

Why should newborns be given vitamin K?

Newborns are given vitamin K because this reduces the risk of bleeding and health damage caused by a vitamin K deficiency.

Vitamin K administration in newborns is widely used as prophylaxis, but parents now view the necessity with scepticism. (Image source: pixabay.com / PublicDomainPictures)

At birth, the baby still has some vitamin K stored in its liver, but it is not yet clear how much has been absorbed. In Germany, the administration of vitamin K to newborns is generally considered common prophylaxis. However, there is no obligation and more and more parents are sceptical.

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