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K Complete

4.8
★ ★ ★ ★ ★
(183 ratings)
Vitamin K 500 mcg
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Score80
A transparent three-form vitamin K softgel offers broad K coverage, but the MK-7 amount is modest and the overall pathway remains narrow.
How scoring works
Softgel
Quantity:45 Softgel(s) • (45 servings)
Goals:
Bone Health
Cardiovascular Support
General Health
Heart Health
Anti-Aging

Score 80

A transparent three-form vitamin K softgel offers broad K coverage, but the MK-7 amount is modest and the overall pathway remains narrow.
How scoring works

Also available as

1 option
90 servings K 500 mcg • 90 Softgel(s) • 90 servings $44.63 ($0.49 per serving)
$22.43($0.49 per serving)
Vitacost
$ 25.42
iHerb
$ 22.43
Report prices

Analysis

The serving combines 500 mcg of K1, 1.5 mg of MK-4, and 45 mcg of MK-7. That spread covers normal clotting needs as well as shorter- and longer-acting K2 activity.

Form-level disclosure is a major strength, and softgel delivery suits all three fat-soluble actives. The MK-7 contribution is conservative despite the large total vitamin K amount.

It fits people who specifically want multiple vitamin K forms rather than an MK-7-only product. Calcium, vitamin D, magnesium, and broader cardiovascular nutrients are not included.

Who is it for
  • Adults seeking K1 plus two K2 forms
  • People who prefer a broad vitamin K blend
  • Users who already cover other bone nutrients
Best for
  • Multi-form vitamin K intake
  • Combining MK-4 with MK-7
  • Softgel delivery

Pros

  • Discloses K1, MK-4, and MK-7 separately
  • Provides a substantial MK-4 amount
  • Uses a fat-compatible softgel
  • Avoids unrelated ingredients

Cons

  • MK-7 amount is only 45 mcg
  • Does not include vitamin D3
  • Large total vitamin K is unnecessary for some users
  • Covers calcium handling but not the wider range of bone or cardiovascular pathways

Warnings

  • Vitamin K can counteract warfarin and other vitamin K antagonist anticoagulants; use requires prescriber-guided consistency.
  • The serving contains a large total vitamin K amount across three forms, so dose changes should not be made casually.
  • Fat-malabsorption conditions can make vitamin K uptake unreliable, so response may need clinical monitoring.

Nutrient quality

88 Highest impact

Three vitamin K forms provide broad and purposeful coverage. The high total amount and relatively modest MK-4 dose make the profile somewhat uneven.

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Ingredient transparency

83 Highest impact

All vitamin K forms and amounts are clearly disclosed without hidden blends. Missing directions and softgel excipients are the main gaps.

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Customer satisfaction

67 High impact

Aggregate satisfaction is strong and based on a limited evidence base. No firsthand experience details are supplied, so recurring complaints and purpose alignment cannot be checked.

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Value for money

79 High impact

Useful forms provide fair value despite some trade-offs. The package remains competitive in its category.

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Report analysis

Goals

Bone Health
Bone Health
Impact
Highest effect
A- Goal FitA Strength of SupportC- CoverageA- Formula Quality
Vitamin K · 45 mcg

Three forms of vitamin K provide focused support for proteins that bind and direct calcium in bone. The combination includes both MK-4 and the longer-lasting MK-7 form.

The doses are clearly disclosed and appear meaningful for this pathway. Calcium, vitamin D, magnesium, and protein-matrix support are absent, so the formula covers only one part of bone nutrition.

Study evidence
Vitamin K Supportive 78 studies
Cardiovascular Support
Cardiovascular Support
Impact
Highest effect
B Goal FitA+ Strength of SupportC CoverageA- Formula Quality
Vitamin K · 45 mcg

Multiple vitamin K forms target calcium handling and give the formula a clear vascular-health rationale. Human evidence supports effects on vitamin K status and calcification markers, while proof of fewer cardiovascular events remains limited.

MK-4, MK-7, and K1 are all supplied at meaningful amounts. The three K forms are compatible, but they can oppose warfarin and other vitamin K antagonist anticoagulants.

Study evidence
Vitamin K Supportive 40 studies
General Health
General Health
Impact
Highest effect
B+ Goal FitB+ Strength of SupportC- CoverageA Formula Quality
Vitamin K · 45 mcg

The combination provides three disclosed vitamin K forms that support normal calcium handling and bone-related proteins. Including K1 with two K2 forms gives focused, evidence-based coverage of vitamin K activity.

The formula remains narrow and does not cover broader daily nutrition needs on its own. Vitamin K can oppose warfarin and similar anticoagulants, so people using those medicines need clinician-guided intake.

Study evidence
Vitamin K Supportive 34 studies
Heart Health
Heart Health
Impact
High effect
B+ Goal FitA- Strength of SupportC- CoverageA Formula Quality
Vitamin K · 45 mcg

Vitamin K1, MK-4, and MK-7 provide comprehensive vitamin K coverage for calcium regulation and vascular proteins. The formula remains focused on one heart-relevant pathway rather than broader lipid or cardiac-energy support.

All three forms are clearly quantified, with substantial MK-4 and a moderate MK-7 amount. Vitamin K can counteract warfarin and other vitamin K antagonist medicines, so users of those drugs need clinician-guided intake.

Study evidence
Vitamin K Mixed 62 studies
Anti-Aging
Anti-Aging
Impact
High effect
B- Goal FitA- Strength of SupportC- CoverageA- Formula Quality
Vitamin K · 45 mcg

K1, MK-4, and MK-7 provide broad vitamin K coverage for bone proteins and calcium handling. The formula is relevant to structural aging, though evidence does not establish broad healthspan effects by itself.

All three forms and amounts are clearly disclosed, with substantial K1 and MK-4 but a modest MK-7 amount. Vitamin K can oppose warfarin and related anticoagulants, so stable intake and prescriber guidance are essential for users of those medicines.

Study evidence
Vitamin K Supportive 27 studies

Ingredients

IngredientAmount per serving
Vitamin K1
500 mcg
Vitamin K2 (MK-4)
 1.5 mg
Vitamin K2 (Menaquinone-7)
 45 mcg
Gluten Free Adults 18–50 Women
Report overview
Vitamin K · 500 mcg OverallScore80
A- Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyC Value

The softgel clearly combines K1, high-dose MK-4, and a maintenance amount of generic MK-7. Lipid-compatible delivery supports absorption, though the MK-7 amount remains below the clinical range. The broader vitamin K spectrum provides fair value, and warfarin users need consistent intake with clinician guidance.

View ingredientView products
Loading alternative details
86 Performance

Vitamin K2 MK-7 (Menaquinone-7) 90 mcg

Carlson
Compared with K1 together with MK-4 and MK-7 vitamin K2, the alternative provides 90 mcg of MK-7 vitamin K2, and the supplied analysis indicates stronger alignment with the Vitamin K collection. Its focused formula offers solid routine value, though vitamin K can conflict with warfarin and similar vitamin K antagonists.
87 Performance

Vitamin K2 as MK-7 100 mcg

Healthy Origins
Compared with K1 together with MK-4 and MK-7 vitamin K2, the alternative provides 100 mcg of MK-7 vitamin K2, and the supplied analysis indicates stronger alignment with the Vitamin K collection. Vitamin K2 can reduce the effect of warfarin-type anticoagulants.
87 Performance

Vitamin K2 100 mcg

SR Sports Research
Compared with K1 together with MK-4 and MK-7 vitamin K2, the alternative provides 100 mcg of MK-7 vitamin K2, and the supplied analysis indicates stronger alignment with the Vitamin K collection. Vitamin K2 can reduce the effect of warfarin-type anticoagulants, so intake changes require prescriber guidance.
88 Budget

Vitamin K2 MK-7 100 mcg

Nutricost
The supplied serving cost is lower, while the formula provides 100 mcg of MK-7 vitamin K2. Vitamin K2 can interfere with warfarin-type anticoagulants.
89 Budget

Mega D-3 5000 IU & MK-7 180 mcg

NOW
The supplied serving cost is lower, while the formula provides 125 mcg of vitamin D3 with 180 mcg of MK-7 vitamin K2. High vitamin D remains the main dosing limitation, while the dry capsule lacks stated fat-intake guidance.
85 Budget

Vitamin K2 MenaQ7 100 mcg

AN Amazing Nutrition Amazing Formulas
The supplied serving cost is lower, while the formula provides vitamin k2. Its vitamin K can counteract warfarin and related vitamin K antagonists, so people using those medicines need clinician-directed intake.
87 Value

MK-7 Vitamin K-2 100 mcg

NOW
100 mcg of MK-7 vitamin K2 offers a practical value trade-off because the supplied serving cost is lower and the value analysis is stronger. Its long supply supports strong value, though vitamin K can conflict with warfarin and similar vitamin K antagonists.
87 Value

Low Dose Vitamin K2 (MK-7) 45 mcg

Life Extension
45 mcg of MK-7 vitamin K2 offers a practical value trade-off because the supplied serving cost is lower and the value analysis is stronger. Its focused formula offers good routine value, though vitamin K can conflict with warfarin and similar vitamin K antagonists.
86 Value

Vitamin K2 MK-7 (Menaquinone-7) 90 mcg

Carlson
90 mcg of MK-7 vitamin K2 offers a practical value trade-off because the supplied serving cost is lower and the value analysis is stronger. Its focused formula offers solid routine value, though vitamin K can conflict with warfarin and similar vitamin K antagonists.
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Menaquinone-7 supplementation improves arterial stiffness in healthy postmenopausal women. A double-blind randomised clinical trial.
    Knapen MH; Braam LA; Drummen NE; Bekers O; Hoeks AP; Vermeer C · Thrombosis and haemostasis · 2016
    Randomized trial244 participantsCardiovascular Support Heart Health forVitamin K
  2. The relationship between vitamin K and peripheral arterial disease.
    Vissers LET; Dalmeijer GW; Boer JMA; Verschuren WMM; van der Schouw YT; Beulens JWJ · Atherosclerosis · 2017
    Cohort study36,629 participantsCardiovascular Support forVitamin K
  3. Interventions to Attenuate Cardiovascular Calcification Progression: A Systematic Review of Randomized Clinical Trials.
    Murali S; Smith ER; Tiong MK; Tan SJ; Toussaint ND · Journal of the American Heart Association · 2024
    Systematic review9,901 participants49 studies pooledCardiovascular Support forVitamin K
  4. Vitamin K status, cardiovascular disease, and all-cause mortality: a participant-level meta-analysis of 3 US cohorts.
    Shea MK; Barger K; Booth SL; Matuszek G; Cushman M; Benjamin EJ; Kritchevsky SB; Weiner DE · The American journal of clinical nutrition · 2020
    Meta-analysis3,891 participants3 studies pooledAnti-Aging General Health forVitamin K
  5. Topical Menaquinone‑7 (Vitamin K2, MK-7) as a Mitochondrial Bioenergetic Activator for Skin Anti-Aging: Mechanistic Evidence in Skin Cells and a Randomized Split-Face/Neck Study.
    Huang H; Wei R; Xu C; Liu C; Zhao S; Li Y; Wang M · ACS omega · 2026
    Randomized trial30 participantsAnti-Aging forVitamin K
  6. Vitamin K status and cognitive function in healthy older adults.
    Presse N; Belleville S; Gaudreau P; Greenwood CE; Kergoat MJ; Morais JA; Payette H; Shatenstein B; Ferland G · Neurobiology of aging · 2014
    Cross-sectional study320 participantsAnti-Aging forVitamin K
  7. High dephospho-uncarboxylated matrix Gla protein concentrations, a plasma biomarker of vitamin K, in relation to frailty: the Longitudinal Aging Study Amsterdam.
    Machado-Fragua MD; Hoogendijk EO; Struijk EA; Rodriguez-Artalejo F; Lopez-Garcia E; Beulens JW; van Ballegooijen AJ · European journal of nutrition · 2021
    Cohort study644 participantsAnti-Aging forVitamin K
  8. Vitamin K Concentration and Cognitive Status in Elderly Patients on Anticoagulant Therapy: A Pilot Study.
    Alisi L; Cafolla C; Gentili A; Tartaglione S; Curini R; Cafolla A · Journal of aging research · 2022
    Cross-sectional study85 participantsAnti-Aging forVitamin K
  9. Vitamin K and the prevention of fractures: systematic review and meta-analysis of randomized controlled trials.
    Cockayne S; Adamson J; Lanham-New S; Shearer MJ; Gilbody S; Torgerson DJ · Archives of internal medicine · 2006
    Meta-analysis13 studies pooledBone Health forVitamin K
  10. Three-year low-dose menaquinone-7 supplementation helps decrease bone loss in healthy postmenopausal women.
    Knapen MH; Drummen NE; Smit E; Vermeer C; Theuwissen E · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial244 participantsBone Health forVitamin K
  11. Effect of combined administration of vitamin D3 and vitamin K2 on bone mineral density of the lumbar spine in postmenopausal women with osteoporosis.
    Iwamoto J; Takeda T; Ichimura S · Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association · 2001
    Randomized trial92 participantsBone Health forVitamin K
  12. Efficacy and safety of vitamin K2 for postmenopausal women with osteoporosis at a long-term follow-up: meta-analysis and systematic review.
    Zhou M; Han S; Zhang W; Wu D · Journal of bone and mineral metabolism · 2022
    Meta-analysis6,853 participants9 studies pooledBone Health forVitamin K
  13. Low-dose vitamin K2 (MK-4) supplementation for 12 months improves bone metabolism and prevents forearm bone loss in postmenopausal Japanese women.
    Koitaya N; Sekiguchi M; Tousen Y; Nishide Y; Morita A; Yamauchi J; Gando Y; Miyachi M; Aoki M; Komatsu M; Watanabe F; Morishita K; Ishimi Y · Journal of bone and mineral metabolism · 2015
    Randomized trial48 participantsBone Health forVitamin K
  14. Vitamin K Intake and Atherosclerotic Cardiovascular Disease in the Danish Diet Cancer and Health Study.
    Bellinge JW; Dalgaard F; Murray K; Connolly E; Blekkenhorst LC; Bondonno CP; Lewis JR; Sim M; Croft KD; Gislason G; Torp-Pedersen C; Tjønneland A; Overvad K; Hodgson JM; Schultz C; Bondonno NP · Journal of the American Heart Association · 2021
    Cohort study53,372 participantsCardiovascular Support Heart Health forVitamin K
  15. Effects of One-Year Menaquinone-7 Supplementation on Vascular Stiffness and Blood Pressure in Post-Menopausal Women.
    de Vries F; Bittner R; Maresz K; Machuron F; Gåserød O; Jeanne JF; Schurgers LJ · Nutrients · 2025
    Randomized trial165 participantsCardiovascular Support forVitamin K
  16. Dietary Vitamin K1 Intake and Incident Aortic Valve Stenosis.
    Schultz CJ; Dalgaard F; Bellinge JW; Murray K; Sim M; Connolly E; Blekkenhorst LC; Bondonno CP; Lewis JR; Gislason GH; Tjønneland A; Overvad K; Hodgson JM; Bondonno NP · Arteriosclerosis, thrombosis, and vascular biology · 2024
    Cohort study55,545 participantsCardiovascular Support Heart Health forVitamin K
  17. Association between vitamin K1 intake and mortality in the Danish Diet, Cancer, and Health cohort.
    Palmer CR; Bellinge JW; Dalgaard F; Sim M; Murray K; Connolly E; Blekkenhorst LC; Bondonno CP; Croft KD; Gislason G; Tjønneland A; Overvad K; Schultz C; Lewis JR; Hodgson JM; Bondonno NP · European journal of epidemiology · 2021
    Cohort study56,048 participantsCardiovascular Support Heart Health forVitamin K
  18. Dietary vitamin K intake associates with reduced all-cause mortality in non-alcoholic fatty liver disease patients.
    Huang Y; Zhu X; Han L; Hu H · Scientific reports · 2025
    Cohort study7,857 participantsGeneral Health forVitamin K
  19. The Effect of Topical Vitamin K1 on the Treatment of Cetuximab-Induced Skin Rashes in Metastatic Colorectal Cancer Patients.
    Roayaei M; Rezaei M; Najafizade N · Advanced biomedical research · 2024
    Randomized trial49 participantsGeneral Health forVitamin K
  20. Effect of vitamin K on improving post‑kidney transplant outcomes: a meta‑analysis.
    Sun Z; Zhu K; Liang G; Yan F; Chao S; Jia L; Niu Y · Experimental and therapeutic medicine · 2023
    Meta-analysis7 studies pooledGeneral Health forVitamin K
  21. Vitamin K1 intake is associated with lower risk for all-cause and cardiovascular disease mortality in community-dwelling older Australian women.
    Dupuy M; Radavelli-Bagatini S; Zhong L; Dalla Via J; Zhu K; Blekkenhorst LC; Bondonno NP; Linneberg A; Bellinge JW; Schultz C; Courtney W; Prince RL; Hodgson JM; Lewis JR; Sim M · Nutrition, metabolism, and cardiovascular diseases : NMCD · 2024
    Cohort study1,436 participantsGeneral Health forVitamin K
  22. The effect of vitamin K1 on arterial calcification activity in subjects with diabetes mellitus: a post hoc analysis of a double-blind, randomized, placebo-controlled trial.
    Bellinge JW; Francis RJ; Lee SC; Bondonno NP; Sim M; Lewis JR; Watts GF; Schultz CJ · The American journal of clinical nutrition · 2022
    Randomized trial149 participantsHeart Health forVitamin K