NEW
☀️ Vitamin D3
Cost per serving
$1.00
30 servings · ~30-day supply
vitamin · 85 active deals
The best-value Vitamin K2 right now is about $0.01 per dose — across 85 tracked products the median is $0.199/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.
Right now the best value across our full Vitamin K2 catalog is at $0.01 per serving.
Recommended daily intake
No established upper limit; MK-7 is the long-acting form. Caution with blood thinners. General FDA/NIH adult guidance — not medical advice.
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.
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 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.
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.
Every Vitamin K2 deal above is ranked by real cost per dose with no paid placement — see our and .
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.
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.
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.
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.
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.
The Food and Nutrition Board did not establish a Tolerable Upper Intake Level (UL) for vitamin K because of its low potential for toxicity, stating 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.
Cost per serving
$1.00
30 servings · ~30-day supply
Cost per serving
$0.40
160 servings · ~160-day supply
Cost per serving
$0.40
60 servings · ~60-day supply
Cost per serving
$0.27
120 servings · ~120-day supply
Cost per serving
$0.40
60 servings · ~60-day supply
Cost per serving
$0.08
120 servings · ~120-day supply
Cost per serving
$0.10
250 servings · ~250-day supply
Cost per serving
$0.04
360 servings · ~360-day supply
Cost per serving
$0.06
360 servings · ~360-day supply
Cost per serving
$0.37
60 servings · ~60-day supply
Cost per serving
$0.08
120 servings · ~120-day supply
Cost per serving
$0.06
360 servings · ~360-day supply
Cost per serving
$0.25
120 servings · ~120-day supply
Cost per serving
$0.07
365 servings · ~365-day supply
Cost per serving
$0.25
60 servings · ~60-day supply
Cost per serving
$0.37
75 servings · ~75-day supply
Cost per serving
$0.07
365 servings · ~365-day supply
Cost per serving
$0.17
120 servings · ~120-day supply
Cost per serving
$0.32
60 servings · ~60-day supply
Cost per serving
$0.60
60 servings · ~60-day supply
Cost per serving
$0.07
120 servings · ~120-day supply
Cost per serving
$0.28
90 servings · ~90-day supply
Cost per serving
$0.08
60 servings · ~60-day supply
Cost per serving
$0.07
300 servings · ~300-day supply
Amazon.com · ☀️ Vitamin D3
CPS
Price
$29.95
Amazon.com · ☀️ Vitamin D3
CPS
Price
$63.90
Amazon.com · 🦴 Calcium
CPS
Price
$23.97
Amazon.com · 🦴 Calcium
CPS
Price
$32.97
Amazon.com · ☀️ Vitamin D3
CPS
Price
$23.97
Amazon.com · ☀️ Vitamin D3
CPS
Price
$9.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$24.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$14.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$19.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$21.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$9.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$19.97
Amazon.com · ☀️ Vitamin D3
CPS
Price
$29.90
Amazon.com · ☀️ Vitamin D3
CPS
Price
$24.90
Amazon.com · ☀️ Vitamin D3
CPS
Price
$14.80
Amazon.com · ☀️ Vitamin D3
CPS
Price
$27.95
Amazon.com · ☀️ Vitamin D3
CPS
Price
$24.99
Amazon.com · 🥕 Vitamin A
CPS
Price
$19.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$18.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$36.00
Amazon.com · 🦴 Calcium
CPS
Price
$8.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$24.79
Amazon.com · ☀️ Vitamin D3
CPS
Price
$4.99
Amazon.com · ☀️ Vitamin D3
CPS
Price
$19.95
Yes. Vitamin K can have a serious interaction with anticoagulants like warfarin (Coumadin), so consistent intake is needed. Antibiotics, especially cephalosporins, may lower vitamin K status. Bile acid sequestrants (cholestyramine, colestipol) and the weight-loss drug orlistat can reduce its absorption. Discuss your vitamin K status with your health care provider. — per the NIH Office of Dietary Supplements; general information, not medical advice.
BulkSupplements.com Vitamin K2 Powder - Vitamin K2 MK-7 at $0.01 per serving — the lowest cost-per-dose vitamin k2 in our catalog. See the full ranking on the Best Vitamin K2 page.
We're tracking 85 active Vitamin K2 deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
Across 85 tracked Vitamin K2 deals the median cost-per-dose is $0.199; the cheapest quartile comes in under $0.092 per serving. Anything below the median is a solid deal for the same molecule.
Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.
The Food and Nutrition Board did not establish a Tolerable Upper Intake Level (UL) for vitamin K because of its low potential for toxicity, stating 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.
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.
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.
Dosage, upper-limit, deficiency, food-source and interaction facts are sourced from the NIH Office of Dietary Supplements Vitamin K2 fact sheet. General information, not medical advice.
