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Vitamin K-1 100 mcg

Swanson Premium Brand
4.7
★ ★ ★ ★ ★
(1294 ratings)
Vitamin K 100 mcg
Product Image
Score81
A low-cost, clearly labeled K1 tablet for basic clotting support, but a weak choice for K2-oriented bone or arterial use.
How scoring works
Quantity:100 Tablet(s) • (100 servings)
Goals:
General Health
Anti-Aging
Heart Health

Score 81

A low-cost, clearly labeled K1 tablet for basic clotting support, but a weak choice for K2-oriented bone or arterial use.
How scoring works
$10.99($0.10 per serving)
iHerb
$ 10.99
iHerb
$ 10.99
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Analysis

Vitamin K1 supports normal clotting and basic vitamin K status. The single active and amount are clearly listed in an inexpensive tablet.

K1 is less directly aligned than MK-7 with calcium placement in bone and soft tissue. No vitamin D, structural mineral, or fat-based delivery broadens the formula.

The product fits a person specifically directed to use vitamin K1 rather than a shopper seeking K2. It offers limited depth for bone, cardiovascular, or healthy-aging goals.

Who is it for
  • Adults specifically seeking vitamin K1
  • Budget-focused single-ingredient users
  • People with a clinician-directed K1 plan
Best for
  • Basic vitamin K1 supplementation
  • Normal clotting support
  • Simple daily intake

Pros

  • Form and amount are clear
  • Low serving cost
  • Single-ingredient formula

Cons

  • No MK-7 or MK-4
  • Dry tablet lacks a lipid carrier
  • Weak bone and arterial alignment

Warnings

  • Vitamin K1 can oppose warfarin and related vitamin K antagonist medicines
  • Keep intake consistent if an anticoagulation prescriber approves use
  • Take with a meal containing fat unless the label directs otherwise

Nutrient quality

83 Highest impact

Vitamin K1 is a standard usable form, though its source is not specified, and the amount is meaningful for routine standalone vitamin K1 support. The amount is not unnecessarily aggressive, while the single-active formula is not padded with low-value ingredients.

Ingredient transparency

79 High impact

Specific amounts are listed for every supplied active ingredient. No proprietary blend hides active doses, while capsule, softgel, or tablet excipients are not included in the supplied details.

Customer satisfaction

72 High impact

The supplied aggregate satisfaction metric is strong, and the large amount of aggregate feedback makes the metric highly stable. No review excerpts were provided, so recurring complaints and purpose-specific experiences cannot be checked.

Value for money

91 Highest impact

A focused formula and low serving cost support good value. Each tablet provides a meaningful amount at a low cost, while the formula avoids unnecessary active extras.

Report analysis

Goals

General Health
General Health
Impact
High effect
B- Goal FitB- Strength of SupportD- CoverageB+ Formula Quality
Vitamin K · 100 mcg

Vitamin K1 supports normal blood clotting and provides a clearly identified amount in a simple tablet. That role is foundational, but K1 is less aligned than K2 with the bone and cardiovascular focus described for the associated collection.

The single-ingredient design offers limited general-health coverage and does not include vitamin D or a lipid-based delivery system. Vitamin K1 can counteract warfarin and related vitamin K antagonists, so users of those medicines need consistent intake managed by their clinician.

Study evidence
Vitamin K Supportive 34 studies
Anti-Aging
Anti-Aging
Impact
Moderate effect
D+ Goal FitB- Strength of SupportD- CoverageA Formula Quality
Vitamin K · 100 mcg

Vitamin K1 mainly supports normal clotting and has less direct relevance to vascular and skeletal aging than MK-7. The product therefore offers only a narrow nutritional contribution to anti-aging goals.

The 100 mcg amount and vitamin form are clearly stated, but no absorption-oriented delivery is described. People taking warfarin or other vitamin K antagonist medicines should keep vitamin K intake consistent and follow their prescriber’s guidance.

Study evidence
Vitamin K Supportive 27 studies
Heart Health
Heart Health
Impact
Moderate effect
D- Goal FitD+ Strength of SupportF CoverageA Formula Quality
Vitamin K · 100 mcg

Vitamin K1 supports normal clotting but is less directly aligned with arterial calcium management than vitamin K2 as MK-7. The 100 mcg amount is clear, yet it does not provide the preferred K2 form for this goal.

The single-vitamin formula is focused but covers only a narrow pathway with limited cardiovascular evidence. Vitamin K1 directly opposes warfarin and related vitamin K antagonists, so intake should remain medically managed and consistent for users of those medicines.

Study evidence
Vitamin K Mixed 62 studies

Ingredients

IngredientAmount per serving
Vitamin K-1
100 mcg
Adults 18–50
Report overview
Vitamin K · 100 mcg OverallScore27
F Active Ingredient Quality & BioavailabilityD- Dose, Safety & Label TransparencyF Value

The clearly identified K1 form mainly supports normal blood clotting rather than the broader bone and heart uses associated with K2. Its low cost does not offset the absence of MK-7 or an absorption-focused delivery system. Vitamin K1 can reduce the effect of warfarin and related vitamin K antagonists, so people using those medicines need consistent intake under medical guidance.

View ingredientView products
Loading alternative details
86 Performance

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

Carlson
Compared with vitamin k-1, 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 D3 25 mcg (1000 IU) & K2 120 mcg

Natural Factors
Compared with vitamin k-1, the alternative provides 25 mcg of vitamin D3 with 120 mcg of MK-7 vitamin K2, and the supplied analysis indicates stronger alignment with the Vitamin K collection. Duplicate K2 source entries create minor label ambiguity, though the softgel and strong value are practical strengths.
86 Performance

MK-7 90 mcg

Jarrow Formulas
Compared with vitamin k-1, the alternative provides 90 mcg of MK-7 vitamin K2, and the supplied analysis indicates stronger alignment with the Vitamin K collection. Its vitamin K can counteract warfarin and related vitamin K antagonists, so people using those medicines need clinician-directed intake.
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.
86 Budget

Liquid D-3 & MK-7

NOW
The supplied cost data do not establish a lower serving cost, so this is a fallback rather than a true cheaper choice. It still provides 62.5 mcg of vitamin D3 with 100 mcg of MK-7 vitamin K2, but its vitamin K can oppose warfarin and related vitamin-K-antagonist anticoagulants, while vitamin D should be considered alongside other supplemental sources.
85 Budget

Vitamin K2 MenaQ7 100 mcg

AN Amazing Nutrition Amazing Formulas
The supplied cost data do not establish a lower serving cost, so this is a fallback rather than a true cheaper choice. It still provides vitamin k2, but its vitamin K can counteract warfarin and related vitamin K antagonists, so people using those medicines need clinician-directed intake.
89 Value

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

NOW
125 mcg of vitamin D3 with 180 mcg of MK-7 vitamin K2 offers a practical value trade-off because the supplied value analysis is stronger. High vitamin D remains the main dosing limitation, while the dry capsule lacks stated fat-intake guidance.
86 Value

Vitamins D3 2500 IU (62.5 mcg) & K2 120 mcg

NaturesPlus
62.5 mcg of vitamin D3 with 120 mcg of MK-7 vitamin K2 offers a practical value trade-off because the supplied value analysis is stronger. Its dry tablet lacks a lipid carrier, and MK-7 requires consistent intake for people using warfarin.
86 Value

Vitamin K2 100 mcg + Vitamin D3 125 mcg

Nutricost
125 mcg of vitamin D3 with 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. Vitamin K2 can interfere with warfarin-type anticoagulants.
Report alternatives

Sources

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

  1. Association of vitamin K with cardiovascular events and all-cause mortality: a systematic review and meta-analysis.
    Chen HG; Sheng LT; Zhang YB; Cao AL; Lai YW; Kunutsor SK; Jiang L; Pan A · European journal of nutrition · 2020
    Meta-analysis222,592 participants21 studies pooledHeart Health Cardiovascular Support forVitamin K
  2. Vitamin K Supplementation to Improve Vascular Stiffness in CKD: The K4Kidneys Randomized Controlled Trial.
    Witham MD; Lees JS; White M; Band M; Bell S; Chantler DJ; Ford I; Fulton RL; Kennedy G; Littleford RC; McCrea IV; McGlynn D; Panarelli M; Ralston MR; Rutherford E; Severn A; Thomson N; Traynor JP; Struthers AD; Wetherall K; Mark PB · Journal of the American Society of Nephrology : JASN · 2021
    Randomized trial159 participantsHeart Health forVitamin K
  3. Six weeks phylloquinone supplementation produces undesirable effects on blood lipids with no changes in inflammatory and fibrinolytic markers in postmenopausal women.
    Kristensen M; Kudsk J; Bügel S · European journal of nutrition · 2008
    Randomized trial31 participantsHeart Health forVitamin K
  4. The Association between Dietary Nutrient Intake and Acceleration of Aging: Evidence from NHANES.
    Ma J; Li P; Jiang Y; Yang X; Luo Y; Tao L; Guo X; Gao B · Nutrients · 2024
    Cross-sectional study4,692 participantsAnti-Aging forVitamin K
  5. Vitamin K insufficiency predicts incidence of frailty in community-dwelling older adults: The Otassha Study.
    Azuma K; Osuka Y; Kojima N; Sasai H; Inoue S · Journal of bone and mineral metabolism · 2023
    Cohort study518 participantsAnti-Aging forVitamin K
  6. New Insights into Vitamin K-From Its Natural Sources through Biological Properties and Chemical Methods of Quantitative Determination.
    Wianowska D; Bryshten I · Critical reviews in analytical chemistry · 2024
    Narrative reviewAnti-Aging forVitamin K
  7. 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
  8. Vitamin K supplementation in postmenopausal women with osteopenia (ECKO trial): a randomized controlled trial.
    Cheung AM; Tile L; Lee Y; Tomlinson G; Hawker G; Scher J; Hu H; Vieth R; Thompson L; Jamal S; Josse R · PLoS medicine · 2009
    Randomized trial440 participantsBone Health forVitamin K
  9. Investigating the interrelationship of vitamin K and vitamin D status on bone density: results from the VITamin D and OmegA-3 TriaL.
    Chou SH; Booth SL; Cook NR; Kim E; Kotler G; Fu X; Buring JE; Manson JE; LeBoff MS · JBMR plus · 2026
    Randomized trial771 participantsBone Health forVitamin K
  10. Circulating uncarboxylated matrix Gla protein, a marker of vitamin K status, as a risk factor of cardiovascular disease.
    van den Heuvel EG; van Schoor NM; Lips P; Magdeleyns EJ; Deeg DJ; Vermeer C; den Heijer M · Maturitas · 2014
    Cohort study577 participantsCardiovascular Support forVitamin K
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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 participantsHeart Health forVitamin K
  22. 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 participantsHeart Health forVitamin K
  23. 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
  24. 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 participantsHeart Health forVitamin K
  25. 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 participantsHeart Health forVitamin K