Vitamin K Complex Guide: K1, K2, MK-4, MK-7, Safety and Where to Buy

Vitamin K Complex usually refers to a supplement that combines more than one form of Vitamin K, such as Vitamin K1, Vitamin K2 MK-4 and Vitamin K2 MK-7.

Vitamin K supports normal blood clotting and is involved in bone-related proteins. However, Vitamin K supplements are not suitable for everyone. The main caution is interaction with warfarin and similar anticoagulants.

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K1 vs K2

Vitamin K1: mostly found in leafy green vegetables and strongly linked with clotting function.
Vitamin K2 MK-4: a K2 form found in some animal foods and supplements.
Vitamin K2 MK-7: a longer-acting K2 form commonly used in supplements.

Who Uses Vitamin K Complex?

People wanting more than one Vitamin K form
People comparing K1 with K2
People using bone-support supplement routines
People already using D3 and wanting to compare K formulas

Recommended Merchant Options

iHerb Vitamin K Complex

iHerb has the widest range of Vitamin K complex products, including K1 + K2 blends, MK-4 + MK-7 formulas and D3 + K combinations.

Shop Vitamin K Complex at iHerb here

Nutricost K2 Options

Nutricost offers standalone K2 MK-7 and K2 MK-4 products. These are not full K-complex formulas, but they are useful for people comparing K2 forms.

Check Nutricost K2 MK-7 here

Check Nutricost K2 MK-4 here

Dr. Berg D3 & K2

Dr. Berg’s D3 & K2 formula is a related product for people wanting K2 with Vitamin D3. It is not a complete K1/K2 complex.

Check Dr. Berg D3 & K2 here

Food Sources of Vitamin K

K1 is found in kale, spinach, broccoli, parsley, cabbage and other leafy greens. K2 is found in natto, some cheeses, egg yolks and animal foods.

Safety and Cautions

If you take warfarin, do not change Vitamin K supplement intake without medical advice. This includes K1, K2, K complex and D3 + K2 formulas.

FAQ

Is Vitamin K Complex better than K2?

Not always. K complex gives multiple forms, while K2-only products target MK-4 or MK-7 specifically.

Can Vitamin K Complex be taken with D3?

It is common, but people on anticoagulants need professional advice first.

Does Vitamin K thin the blood?

No. Vitamin K is involved in normal clotting. It can reduce warfarin’s effect if intake changes suddenly.

Final Thoughts

Vitamin K Complex may suit people wanting several Vitamin K forms in one supplement. Browse Vitamin K Complex at iHerb, or compare standalone Nutricost K2 MK-7 and Nutricost K2 MK-4.

Health disclaimer: This article is general information only. Do not use Vitamin K supplements with warfarin unless your healthcare professional approves it.

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