Question 1

What is Vitamin K2 and what does it do in the body?

Accepted Answer

Vitamin K2 is a fat-soluble vitamin that plays a role in directing calcium to the right places in the body. Research suggests it may support bone mineralisation by activating osteocalcin, a protein that helps bind calcium to bone, and may help prevent calcium from depositing in arteries. It is distinct from Vitamin K1, which is found in green vegetables and primarily supports blood clotting.

Question 2

Is it safe to take Vitamin K2 every day?

Accepted Answer

Vitamin K2 is generally considered safe for daily use in healthy adults without pre-existing conditions at typical supplemented doses. ICMR-NIN has set an RDA of 55mcg per day for Vitamin K in adults. At supplemental doses, Vitamin K2 has not been associated with toxic side effects in healthy individuals. However, people with kidney disease, clotting disorders, or those on anticoagulant medication should avoid supplementation without medical guidance.

Question 3

Are Vitamin K2 supplements suitable for vegetarians?

Accepted Answer

Not all Vitamin K2 supplements are vegetarian. Many contain MK-4 derived from animal sources or use gelatin capsules. However, MK-7 can be produced through fermentation of plant sources such as natto or chickpeas, making those variants suitable for vegetarians. Look for products that clearly state vegetarian or plant-based certification, and check Unbox Health's lab-tested data to verify whether the declared ingredients and form match what the product actually contains.

Question 4

Can Vitamin K2 supplements interfere with blood thinners?

Accepted Answer

Yes, Vitamin K2 can interfere with warfarin, a commonly prescribed anticoagulant in India, by reducing its effectiveness. Research indicates that doses above 50mcg per day may affect INR levels, which warfarin-dependent patients require monitoring for. Most Vitamin K2 supplements in India contain 55mcg or more per dose. Individuals on warfarin or with clotting disorders should not take Vitamin K2 supplements without specific medical guidance.

Question 5

What is the difference between Vitamin K1 and Vitamin K2?

Accepted Answer

Vitamin K1 (phylloquinone) is found primarily in green leafy vegetables and is mainly involved in blood clotting. Vitamin K2 (menaquinone) is found in fermented foods and animal products, and is more specifically associated with bone metabolism and cardiovascular health. While the body can convert some K1 to K2, research suggests this conversion is limited and variable, which is why dedicated K2 supplementation is sometimes considered separately.

Question 6

How much Vitamin K2 should you take per day?

Accepted Answer

ICMR-NIN has set an RDA of 55mcg per day for total Vitamin K in adults. ICMR-NIN has not published a separate specific guideline for Vitamin K2 (MK-7) alone. International research studies have used daily doses ranging from 90 to 200mcg for MK-7, but these are not Indian recommendations. Products providing 45 to 100mcg of K2 per serving represent the range most commonly available in India.

Question 7

What is the difference between MK-4 and MK-7 forms of Vitamin K2?

Accepted Answer

MK-4 and MK-7 are two forms of Vitamin K2, differing primarily in their half-life. MK-7, typically derived from fermented sources like natto, remains active in the blood for up to three to four days, allowing for once-daily dosing at lower amounts. MK-4 has a much shorter half-life of a few hours. Studies suggest MK-7 may offer more consistent activation of Vitamin K-dependent proteins with daily supplementation.

Question 8

Should I take Vitamin K2 on an empty stomach or with food?

Accepted Answer

Vitamin K2 is a fat-soluble vitamin, which means it is better absorbed when taken with a meal containing some fat. Taking it on an empty stomach may reduce absorption. Most Vitamin K2 supplement labels recommend taking it with a main meal. In India, where lunch or dinner typically contains cooking oils or ghee, those meals are a practical time to take a Vitamin K2 supplement.

Question 9

Should I take Vitamin K2 with Vitamin D3?

Accepted Answer

Vitamin D3 and Vitamin K2 are often paired because both regulate calcium. Vitamin D3 increases calcium absorption from the gut, while Vitamin K2 may help direct calcium into bones rather than soft tissues. Many Indian supplements are sold as D3+K2 combinations. ICMR-NIN has not issued specific combination guidelines. Before buying, check Unbox Health's lab-tested data to verify whether declared K2 and D3 levels match actual tested content.

Question 10

How do I choose a good Vitamin K2 supplement in India?

Accepted Answer

A good Vitamin K2 supplement should clearly state the form (MK-7 is generally preferred for its longer half-life), the dose per serving relative to the ICMR-NIN RDA of 55mcg, and whether it is vegetarian or animal-derived. Prices and claims vary widely across brands. Use Unbox Health's independently lab-tested ratings to compare which brands actually deliver the Vitamin K2 content they claim and confirm the product contains no undeclared additives.

Vitamin K2 Supplements

Choose the best Vitamin K2 Supplement for you based on independent lab-tested ratings. Vitamin K2 MK7, Vitamin K2 MK4, Vitamin D3 K2 and more.

Decode Age DAKE | Vitamin D3, K2, A & E

Origins Nutra Magnesium + D3 + K2 for Men

Origins Nutra Magnesium + D3 + K2 for Women

Origins Nutra Bone Strength

iThrive Essentials Vitamin D3 K2 Liquid Drops

Carbamide Forte Calcium & Vitamin D3

AS-IT-IS ATOM Vitamin D3 & K2

HealthyHey Nutrition Bonemax - Calcium with Magnesium, Vitamin D3 & Vitamin K2

HealthyHey Nutrition Vitamin K2

Wellbeing Nutrition Natural Vitamin D3

More Lab-Tested Categories

How We Rate Vitamin K2 Supplements