SFI Health

Klaire Labs SFI Health Ultra K2 Menaquinone - 4 - Vitamin K2 Supplement with 15mg of Vitamin K2

275+ bought in the past month

$59.87

About this item

  • Premium Form of Vitamin K - Ultra K2 provides 15 mg of vitamin K2 in the MK-4 form. Vitamin K2 MK4 can help support healthy bones and connective tissue. By promoting normal cartilage health, it can also help support joint mobility and flexibility.*
  • Promote Bone Health & Healthy Calcium Use - The K2 vitamin plays an important role when it comes to calcium. It can help activate the calcium-binding properties of proteins, which enables calcium to travel to, and benefit, different tissues around the body.*
  • Support Cardiovascular Health - The K2 form of Vitamin K has been clinically studied for its role in supporting healthy bone metabolism and cardiovascular health.*
  • Non-GMO and Vegan - This hypoallergenic Vitamin K2 supplement is free of the following common allergens: milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, soybeans, corn, and yeast. It contains no artificial colors, flavors, or preservatives.
  • Klaire Labs is Now SFI Health - Klaire Labs has been part of the SFI Health family for many years leading the way in efficacy, safety, quality, and trusted by healthcare practitioners. While we might be changing the way things look, rest assured that our formulations and Vit K2 supplement lines remain the same.
$59.87

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Product details

BrandSFI Health
Item FormCapsule
Primary Supplement TypeCalcium
Diet TypeVegan
FlavorUnflavored

Technical specifications

is_discontinued_by_manufacturerNo
package_dimensions3.31 x 1.73 x 1.73 inches; 1.13 ounces
date_first_availableJuly 23, 2018
manufacturerSFI Health
best_sellers_rank#58,964 in Health & Household ( See Top 100 in Health & Household ) #18 in Vitamin K1 Supplements

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Customer reviews

4.8134 ratings

Customers say

Customers find the vitamin K supplement to be of high quality and effective, with one mentioning it helps build bone density.

★★★★★

Accurate count

Blue HonoluluJune 6, 2024

So far my husband and I have used 7 bottles, 90 capsules in each bottle, 3 capsules daily (45mg) for each of us. We are pleased that the capsule count has always been on the mark. We count before starting a bottle and, unlike reports of several other brands undercounting and selling short, exactly 90 capsules is what Klaire Labs has given us. Thus we suspect that Klaire Labs' quality control is superior to other brands. As for improving bone health, the verdict is still out. We supplement K2/MK4 with daily Calcium, D3 and Magnesium Glycinate for bone health. My next scheduled DEXA scan in 2 years will tell if 45mg of K2/MK4 taken daily, combined with the other 3 supplements, will either reverse or keep osteoporosis at bay. If it does not, we'll investigate other options as this is a pricey product. Stay tuned for my next review in 2 years. Read more

★★★★★

Great price for an actually therapeutic dose

Jacob BabinecJune 12, 2025

Good value for therapeutic dose. Read more

★★★★★

K2 MK4 in recommended amount

Susan DMay 3, 2025

This is a hard to find version of vitamin K2 that has the amount recommended by Japanese studies. Glad to find it on Amazon. Very small capsules so easy to take. Read more

★★★★★

Expensive but seems to work.

Tonyusa2000December 13, 2025

Seems to work clearing out the arteries but expensive. Read more

★★★★★

Love that it’s split into three doses

icanhaztacoOctober 31, 2025

Very tough to find MK-4 split into three daily doses. But pricey for me but it’s an important supplement in my opinion Read more

★★★★★

High quality product

Kay J.October 12, 2024

High quality product recommended by my naturopath. Read more

★★★★☆

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CustomerFebruary 16, 2024

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★★★★★

high potency K2 MK4 is a good velue

Arthur F. LangeJuly 19, 2023

this K2 MK4 product is a good way to keep blood pressure under control (see pubmed) most other K2 formulations are only in the microgram doses and have a corresponding lower benefit. Read more

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