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Customer Ratings & Reviews

100% authenticOur products are sourced directly from brands or authorized distributors.Show more
4.8
Based on 5,737 ratings
5,095
474
126
21
21
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What customers say
Customers highly praise this Vitamin K supplement for its quality, effectiveness, and comprehensive formulation. The product combines Vitamin K1 and two forms of K2 (MK-4 and MK-7), which are noted for their optimal absorption and utilization by the body. Many users report positive changes in overall well-being, improved bone density, better arterial health, and enhanced tooth health after incorporating it into their daily routines. The capsules are easy to swallow, making them convenient for regular use. Some customers also appreciate the fast delivery service. However, a few users mentioned concerns about undesirable extra ingredients. Overall, the supplement is recommended for its high-quality ingredients and beneficial impact on health.
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Customer reviews (5,664)
Product reviews solely reflect the views and opinions expressed by the contributors and not those of iHerb. iHerb does not verify or endorse any claims made in these reviews. Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
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Reviews from Czech Republic
Reviewer Country
English
Translated reviews
iHerb customer
Posted on Apr 8, 2026
Czech Republic
17
1
0
2
Life Extension Super K
Verified purchase
Life Extension Super K has become a reliable part of my daily routine. I take it mainly for long-term cardiovascular and bone health, and I like that it includes both K1 and K2 forms. It feels like a well-rounded product with good potency, and I haven’t had any issues with tolerance. If you’re looking to support healthy calcium utilization and vascular function, this is a strong option.
iHerb customer
Posted on Apr 28, 2023
Czech Republic
4
0
0
4
Super K is a must-have for anyone looking to maintain their bone and arterial health
Verified purchase
Vitamin K is an essential nutrient that is often difficult to obtain through diet alone, making a supplement a great option for those who want to ensure they are getting enough. Super K provides three different forms of vitamin K, including K1 and two forms of K2 (MK-4 and MK-7) for optimal absorption and utilization. The benefits of vitamin K are far-reaching, from maintaining bone density to supporting healthy arterial function. In addition, clinical studies have shown that people who consume more dietary K2 have healthier cardiovascular systems. Super K offers an easy way to support healthy bone strength and density while promoting a healthy calcium balance in your arteries. While K1 is found in leafy greens, it is tightly bound to plant cells, making it difficult to absorb. On the other hand, vitamin K2 is found in small amounts in cheese, egg yolks, and some meats, and is up to eight times more bioavailable than K1. The MK-4 form of K2 is rapidly absorbed but only lasts in the bloodstream for a short time, while MK-7 can stay available in the body for up to 48 hours and at much higher levels. Super K's MK-7 is made from an innovative bio-fermentation process for optimal potency. With just one daily softgel, Super K provides a generous dose of vitamin K, including 100 mcg of vitamin K2 (MK-7), 1,000 mcg of vitamin K2 (MK-4), and 1,500 mcg of vitamin K1. Super K is also gluten-free, non-GMO, and LE certified for quality and purity. Overall, Super K is an excellent choice for anyone looking to support their bone and arterial health with a high-quality vitamin K supplement.
Lateefah
Posted on Oct 13, 2025
Saudi Arabia
47
0
0
19
ممتاز!
Verified purchase
Quality is super! The ingredients are great! Size arranged! What you need! Performance is felt! the product arranged, perfectly packed, the effect is definitely there! I will order more! Just as quickly delive
klaro
Posted on Aug 19, 2025
55
0
2
6
quality K complex
Verified purchase
I like this brand which I can trust for supplements. I think this is really good quality Vitamin K complex that you want to take together with D3.
Audaliya
Posted on Nov 8, 2024
Spain
55
1
4
34
Favorite K-complex
Verified purchase
Great complex with Vitamin K1, K2-MK7 and K2-MK4 in balanced dosages. Reliably increases my Vitamin K2 blood levels. However, Vitamin K1 levels in blood test have not improved as much with this supplement.
Barefooter
Silver
Posted on Apr 5, 2026
United States
177
0
11
66
Good bramd
Verified purchase
This brand seems to be a good one, in my view. I prefer this Vitamin K over other brands I have used. I really like that they are softgels instead of dry capsules.
The-High-Evolutionary
Gold
Posted on Mar 31, 2026
Netherlands
701
0
22
522
Comprehensive vitamin K formula
Verified purchase
High-quality vitamin K supplement with a well-rounded mix of K1 and K2 forms. I like that it combines different types for broader support, especially for bone and cardiovascular health. Easy to take and from a trusted brand.
iHerb customer
Gold
Posted on Dec 5, 2025
Switzerland
369
1
0
452
The Best Vitamin K complex
Verified purchase
I wouldn't think finding a good vitamin K complex can be that difficult, this one provides various forms in proper dosages. I am a bit unhappy the Vitamin K2 MK-7 comes now in lower dose than previously, but still couldn't find anything better than that. High quality.
fie-koi
Posted on Dec 14, 2023
Greece
159
1
8
171
Essential along with high doses of vit D
Verified purchase
Life Extension is a high quality brand which I like, I am constantly buying this vitamin K (Two Forms of K2 Plus K1). Need to get vitamin K when you get high doses of vitamin D -so that the excess calcium does not deposit itself in all the wrong places. Some -a few- countries were giving to their citizens a pack containing vit D among other things during the coronavirus crisis. So, the vital vitamin D, gets paired with this excellent form of vit K.
iHerbCustomer
Posted on Mar 29, 2024
United Arab Emirates
20
19
0
17
Super K
Verified purchase
Super K Benefits Helps maintain bone health Supports heart & arterial health Contains three forms of vitamin K Supports vascular health by promoting healthy calcium balance
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