Evereith Nattokinase 10800 FU Supplement with Ubiquinol CoQ10…
EvereithAmazon.com
$0.42/serving
$24.950°
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Vitamin K2
vitamin · 90 active deals
How much does Vitamin K2 cost?
The best-value Vitamin K2 right now is about $0.02 per dose — across the 42 we can price per dose the median is $0.121/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Vitamin K2 deal here is ranked by cost per dose — what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Prices checked · live from the Amazon US catalog.
Right now the best value across our full Vitamin K2 catalog is at $0.02 per serving.
Median $0.121/servingCheapest quartile under $0.075across 42 tracked Vitamin K2 deals
Recommended daily intake
Daily Value 120 mcgUpper limit none established
No established upper limit; MK-7 is the long-acting form. Caution with blood thinners. General FDA/NIH adult guidance — not medical advice.
What Vitamin K2 does
Vitamin K is a fat-soluble vitamin that functions as a coenzyme for vitamin K-dependent carboxylase, an enzyme required for the synthesis of proteins involved in hemostasis (blood clotting) and bone metabolism, among other physiological functions; for example, prothrombin is a vitamin K-dependent clotting protein, and osteocalcin and matrix Gla-protein are vitamin K-dependent proteins involved in bone and in the regulation of calcification. It has been studied for a possible role in bone health and osteoporosis: some, but not all, studies link higher vitamin K intakes with higher bone mineral density and/or lower hip fracture incidence, and the NIH notes it is unclear whether supplementation with any form of vitamin K reduces the risk of osteoporosis, since trial results are mixed and may be influenced by co-administered vitamin D and calcium. It has also been studied for a possible role in coronary heart disease through vascular calcification, but the NIH states that the role of the different forms of vitamin K on arterial calcification and coronary heart disease risk is unclear and remains an active area of research. FDA has not authorized a health claim for vitamin K in the United States — per the NIH Office of Dietary Supplements; not medical advice.
Forms & absorption
Several forms of vitamin K are used in dietary supplements, including vitamin K1 as phylloquinone or phytonadione (a synthetic form of vitamin K1) and vitamin K2 as the menaquinones MK-4 or MK-7; menadione (sometimes called vitamin K3) is another synthetic form but is no longer used in supplements or fortified foods after laboratory studies showed it could damage liver cells. The NIH states that few data are available on the relative bioavailability of the various forms of vitamin K supplements. One study found that both phytonadione and MK-7 supplements are well absorbed, but MK-7 has a longer half-life.
Food sources of Vitamin K2
Food sources of phylloquinone (vitamin K1) include vegetables — especially green leafy vegetables — vegetable oils, and some fruits, while meat, dairy foods, and eggs contain low levels of phylloquinone but modest amounts of menaquinones, and natto (fermented soybeans) has high amounts of menaquinones. The most common sources in the U.S. diet are spinach, broccoli, iceberg lettuce, and fats and oils, particularly soybean and canola oil; among the richest are natto, collards, turnip greens, spinach, kale, and broccoli — per the NIH Office of Dietary Supplements.
Vitamin K2 deficiency — who's at risk
Clinically significant vitamin K deficiency in adults is very rare and is usually limited to people with malabsorption disorders (such as cystic fibrosis, celiac disease, ulcerative colitis, or short bowel syndrome) or those taking drugs that interfere with vitamin K metabolism; newborns not treated with vitamin K at birth are also at risk because placental transfer is poor. Bleeding and hemorrhage are the classic signs of deficiency, occurring only in severe cases, and in infants it can cause vitamin K deficiency bleeding (VKDB) — per the NIH Office of Dietary Supplements.
When and how to take Vitamin K2
Vitamin K2 is fat-soluble — take it with a meal containing fat. It is commonly taken alongside vitamin D3, and the two are often sold together.
Can you take Vitamin K2 with other supplements?
Important: vitamin K interacts with warfarin and other blood thinners. If you take an anticoagulant, do not start K2 without your clinician’s guidance, and keep your intake consistent.
General guidance on timing and absorption, not medical advice. Check with a clinician about your medications and conditions.
Resilia Odorless Aged Garlic Softgels (60 Count) | 1200mg Aged…
Resilia Oil Of OreganoAmazon.com
$0.58/serving
$34.990°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.25/serving
$44.990°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.35/serving
$20.990°
Micro Ingredients Vitamin D3 K2 MK-7 10,000 IU Per Serving
Micro IngredientsAmazon.com
$0.14/serving
$24.950°
Resilia Odorless Aged Garlic Extract Softgels (120 Count)…
Resilia Oil Of OreganoAmazon.com
$0.50/serving
$59.990°
Resilia Odorless Aged Garlic Extract Softgels (120 Count)…
Resilia Oil Of OreganoAmazon.com
$0.42/serving
$49.990°
Liposomal Strontium Citrate 680mg Supplement – High Absorption…
CalyverithionAmazon.com
$0.27/serving
$32.990°
Nature's Truth Vitamin K2 MK-7 | 100 mcg | 180 Softgels
Nature's TruthAmazon.com
$0.08/serving
$15.190°
Superior Source Vitamin K2 MK-7 (Menaquinone-7) 100 mcg - Bone…
Superior SourceAmazon.com
$0.30/serving
$17.840°
Extra Strength Vitamin D3+K2 - Vitamin D 4000 IU (100mcg)…
Bayter NutritionAmazon.com
$0.95/serving
$28.450°
MoxyVites Vitamin D3 K2 5000 IU – High Absorption D3 + K2 MK-7…
MoxyVitesAmazon.com
$0.40/serving
$23.970°
Vitamin K2 (MK7) with D3 Lower Dose 45mcg Vitamin K2 & 1000 IU…
BronsonAmazon.com
$0.04/serving
$14.990°
Vitamin D3 K2 Gummies Sugar Free - 60 Count | 5,000 IU Vitamin…
IRIDESICENTAmazon.com
$0.37/serving
$21.990°
Vitamin K2 (MK7) (100mcg) + Vitamin D3 (5000 IU) 120 Softgels…
NutricostAmazon.com
$0.25/serving
$29.900°
Vitamin D3 K2 10000 IU (125mcg) with MK-7 – High Potency Bone…
H&D Labs NutritionAmazon.com
$0.07/serving
$24.900°
Ideal Infusion Vegan Vitamin D3 5000 iu with K2 (MK-7) Liquid…
Ideal InfusionAmazon.com
$0.37/serving
$27.950°
UpNourish Liposomal Vitamin D3 50000 IU (Vitamina D3 de 50000)…
UpNourishAmazon.com
$0.17/serving
$19.990°
Healthy Origins Vitamin D3 & K2 - Vitamin D3, 50 mcg - Vitamin…
Healthy OriginsAmazon.com
$0.32/serving
$18.990°
Metabolic Maintenance Vitamin D3 and K2 Supplements - Vitamin…
Metabolic MaintenanceAmazon.com
$0.60/serving
$36.000°
Micro Ingredients Vitamin D3 5,000 IU + K2 MK-7 100 mcg
Micro IngredientsAmazon.com
$0.09/serving
$54.990°
5-in-1 Vitamin D3 K2 Drops - Vitamin D3 10000 IU & K2(MK-7)…
Venture PalAmazon.com
$0.28/serving
$16.890°
Vitamin D3 K2 USDA Organic Drops - Vitamin D3 10000 IU & K2 as…
NUTRAHARMONYAmazon.com
$0.41/serving
$24.890°
BulkSupplements.com Vitamin D3 50,000IU + Vitamin K2 200mcg…
BulkSupplements.comAmazon.com
$0.08/serving
$28.970°
NatureBell Vitamin D3 50,000 IU with Vitamin K2-180 Softgels…
NatureBellAmazon.com
$0.17/serving
$29.990°
DEAL SUPPLEMENT Vitamin D3 50,000 IU + K2 MK7 200mcg Softgels
DEAL SUPPLEMENTAmazon.com
$0.15/serving
$36.950°
Micro Ingredients Vitamin D3 50,000 IU + K2 MK-7 200 mcg
Micro IngredientsAmazon.com
$0.15/serving
$35.950°
Micro Ingredients Vitamin D3 2,000 IU + K2 MK-7 50 mcg
Micro IngredientsAmazon.com
$0.07/serving
$22.360°
Nutricost Vitamin K2 MK-7 Supplement (100 mcg) 120 Softgels…
NutricostAmazon.com
$0.12/serving
$13.950°
Micro Ingredients Vitamin K2 MK-7 200 mcg Per Serving
Micro IngredientsAmazon.com
$0.08/serving
$23.950°
NatureWise Vitamin D3 1000IU + K2 (MK7) 100mcg with Organic…
NatureWiseAmazon.com
$0.37/serving
$10.990°
Microbiome Labs MegaQuin D3 + K2 - High Potency Vitamin D3 K2…
Microbiome LabsAmazon.com
$0.62/serving
$37.000°
SMARTERNUTRITION Vegan Vitamin D3 5000 IU + Natural Vitamin K2…
SMARTERNUTRITIONAmazon.com
$0.37/serving
$21.950°
SMARTERNUTRITION Vegan Vitamin D3 5000 IU + Natural Vitamin K2…
SMARTERNUTRITIONAmazon.com
$0.35/serving
$63.000°
BulkSupplements.com Vitamin K2 Powder - Vitamin K2 MK-7, as…
BulkSupplements.comAmazon.com
$0.02/serving
$16.970°
Max Absorption Vitamin K2 + D3 (5000IU) 90 Veggie Capsules…
Holistic Health LabsAmazon.com
$0.18/serving
$15.950°
Life Extension Mega Vitamin K2 High Potency for Strong Bones
Life ExtensionAmazon.com
$0.80/serving
$24.030°
ForestLeaf Vitamin D3 + K2 (MK7) Supplement - MenaQ7 - Calcium…
ForestLeafAmazon.com
$0.30/serving
$17.950°
Vitamin D3 K2 - Vitamin D3 10000 iu & K2 as MK-7 120 mcg…
NUTRAHARMONYAmazon.com
$0.18/serving
$21.490°
Every Vitamin K2 deal above is ranked by real cost per dose with no paid placement — see our and .
Independent testing
1 of 44 tracked Vitamin K2 brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
Vitamin K2 — dosage, safety & deals FAQ
- How much Vitamin K do you need per day?
There is no ; the Food and Nutrition Board set Adequate Intakes (AIs). For adults 19+, the AI is 120 mcg for men and 90 mcg for women (including during pregnancy and lactation). Teens 14–18 get 75 mcg. Children: 30 mcg (1–3), 55 mcg (4–8), 60 mcg (9–13). Infants: 2.0 mcg (0–6 months), 2.5 mcg (7–12 months). — per the NIH Office of Dietary Supplements; general information, not medical advice.
- Can you take too much Vitamin K?
The Food and Nutrition Board did not establish a (UL) for vitamin K because of its low potential for toxicity. The Board stated that no adverse effects associated with vitamin K consumption from food or supplements have been reported in humans or animals. — per the NIH Office of Dietary Supplements; general information, not medical advice.
- What are the signs of Vitamin K deficiency?
Deficiency is considered clinically relevant only when prothrombin time increases significantly. Bleeding and hemorrhage are the classic signs, occurring only in severe cases. Because vitamin K is required for carboxylation of osteocalcin in bone, deficiency could also reduce bone mineralization and contribute to osteoporosis. Clinically significant deficiency in adults is very rare. — per the NIH Office of Dietary Supplements; general information, not medical advice.
- Who is most likely to need more Vitamin K?
Two groups are most likely to have inadequate vitamin K status: newborns not treated with vitamin K at birth (poor placental transport raises risk of vitamin K deficiency bleeding), and people with malabsorption disorders such as cystic fibrosis, celiac disease, ulcerative colitis, and short bowel syndrome. Status can also be low after bariatric surgery. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Vitamin K2 guides
Related vitamins
References & sources
- Vitamin K: Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.