Vitamin K2 Guide: MK-7, MK-4, Bone Support, Safety and Where to Buy

Vitamin K2 is a form of Vitamin K commonly used in bone and cardiovascular-support supplement routines. The two main supplement forms are MK-7 and MK-4.

Vitamin K is involved in normal blood clotting and helps activate proteins linked with bone mineralisation. However, Vitamin K2 supplements need caution if you take warfarin or similar anticoagulants.

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What Does Vitamin K2 Do?

Supports normal blood clotting
Helps activate bone-related proteins
Is often paired with Vitamin D3 in bone-support formulas
Appears as MK-7 or MK-4 in supplements

MK-7 vs MK-4

MK-7: long-acting K2 form commonly sourced from natto or fermentation.
MK-4: shorter-acting K2 form also used in supplements.

Recommended Merchant Options

Nutricost Vitamin K2 MK-7

Nutricost lists Vitamin K2 MK-7 softgels with 100mcg per serving and 240 servings per bottle.

Check Nutricost Vitamin K2 MK-7 here

Nutricost Vitamin K2 MK-4

Nutricost also lists Vitamin K2 MK-4 capsules with 100mcg per serving. This is useful for people specifically comparing MK-4 and MK-7.

Check Nutricost Vitamin K2 MK-4 here

Dr. Berg D3 & K2 Vitamin

Dr. Berg lists D3 & K2 formulas combining Vitamin D3 with Vitamin K2. This is not a standalone K2 product.

Check Dr. Berg D3 & K2 here

iHerb Vitamin K2

iHerb carries standalone K2, MK-7, MK-4 and D3 + K2 formulas from multiple brands.

Shop Vitamin K2 at iHerb here

Food Sources of K2

Vitamin K2 is found in fermented foods such as natto, and smaller amounts may be found in some cheeses, egg yolks and animal foods.

Safety and Cautions

Do not start or stop Vitamin K2 if taking warfarin unless your doctor approves it. Vitamin K can change how warfarin works. Consistency is essential.

FAQ

Is K2 the same as K1?

No. K1 is mostly found in green leafy vegetables. K2 includes MK-4 and MK-7 forms.

Can I take K2 with D3?

Many people do, but D3 + K2 formulas are not suitable for everyone, especially those taking warfarin.

Is MK-7 better than MK-4?

MK-7 lasts longer in the body, while MK-4 is also widely used. The best choice depends on the formula and purpose.

Final Thoughts

Vitamin K2 is popular for bone-support routines, especially with D3. Compare Nutricost K2 MK-7, Nutricost K2 MK-4, Dr. Berg D3 & K2 or K2 at iHerb.

Health disclaimer: This article is general information only. Do not use Vitamin K2 with warfarin or similar anticoagulants unless your healthcare professional approves it.

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