What is Vitamin K with D3?
A growing body of research shows that when it comes
to bone health, ensuring optimal intake of vitamin K is
a critical piece of the puzzle. New research is focusing on
the synergistic relationship between vitamin K (specifically,
vitamin K2) and vitamin D3, especially in terms of bone
strength and cardiovascular health.  A group of naturally
occurring and structurally similar, fat-soluble vitamins,
vitamin K is essential for the proper utilization of calcium.
Through its activation of the protein osteocalcin, vitamin K
helps to bind newly absorbed calcium to the mineral matrix
in bone. In addition, vitamin K has been found to help
maintain bone mineral density by decreasing the activity
of osteoclasts, a cell that breaks down the bone matrix. 
Vitamin K also provides critical cardiovascular protection
by helping to carboxylate Matrix GLA Protein (MGP), an
inhibitor of circulatory calcification., Thus, vitamin K
and vitamin D not only share similar qualities, but they
also act synergistically with one another within the body.
This formulation of Vitamin K2 with D3 includes 45 mcg of
vitamin K2 delivered as MK-7 and 5,000 IU of vitamin D3 per
capsule, for optimal absorption and use by the body.
While vitamin D has long been known to assist calcium
absorption, it is vitamin K, through its carboxylation of
osteocalcin, which guides this calcium to bones and prevents
their absorption into organs, joint spaces and arteries. Vitamin
K occurs in three main forms: K1 (phylloquinone), derived from
foods such as green leafy vegetables; K2 (menaquinone), which
originates from bacteria; and a third form, K3 (menadione),
a synthetic analogue. Numerous studies have shown that
vitamin K2 is the more bioavailable form of the nutrient  and
more powerfully influences bone building than K1. In addition,
though both reach the liver, most of the K1 is used for purposes
of coagulation, with little left over to support the body’s needs
elsewhere. The profoundly different degree of bioavailability
between K1 and K2 is due to differences in structure: Only 10-
20% of vitamin K1 that is absorbed from food even reaches the
circulation, while the long side-chain of vitamin K2 allows it to
bind with fat particles in circulation and facilitate its arrival at
soft tissue, bones and arteries. There are two forms of vitamin
K2 commonly used in supplements: MK-4 and MK-7. The MK-7
form has been shown to have six times the activity of MK-4 in
the blood. MK-7 has also been found to remain in the blood
approximately nine times as long as the MK-4 (8 hours versus
72 hours), making it the optimal form of K2 for health. 
Vitamin K Depletion†
Although most people consume adequate dietary vitamin K
to maintain sufficient blood clotting, most do not consume
enough to meet cardiovascular and bone health needs.
Compromised intestinal absorption can also lead to insufficient
K2 levels leaving calcium available to be exported out of bone
and into other tissues. Other medications such as antibiotics,
cholesterol-lowering medications and laxatives have also been
found to contribute to a deficiency of vitamin K. 
Building and maintaining healthy bones requires a number of
key nutrients including vitamin K, for the proper binding of
calcium to the bone matrix. A 2005 study from northern Finland
found that those with greater levels of vitamin K-carboxylated
osteocalcin had stronger bones than those with lower levels
of the protein. A Japanese study found superior bone health
These statements have not been evaluated by the Food and Drug Administration.
This product is not intended to diagnose, treat, cure, or prevent any disease.
among women who were frequent MK-7-rich Natto eaters
than those who were not.  Another randomized study which
split 172 women into a vitamin K2 group, a vitamin D3 group,
a vitamin K2 and D3 group, and a placebo group for 2 years
found that the combination of vitamin D3 and K2 had the most
benefits for supporting bone health among the groups. 
Cardiovascular Health and Blood
Vitamin K plays a key role in supporting the cardiovascular
system as well as healthy blood sugar balance. In a large
population study, researchers found that those who consumed
high amounts of K2 had significantly better cardiovascular
health markers compared to those given vitamin K1.  Studies
have also shown vitamin K supports healthy blood
sugar metabolism. [14, 15]
New evidence also suggests vitamin K plays a central role in
balancing immune health. Recent studies have shown that
both vitamins D and K impart immune-modulating effects. In
the Framingham Offspring Study, one of the longest standing
studies on generational health, higher serum levels of vitamins
D and K were associated with stronger immune function and a
balanced inflammatory response. [16, 17] In a 2011 study, vitamin
K was also found to suppress various markers of the
1 capsule per day or as recommended by your health
Does Not Contain
Wheat, gluten, dairy products, fish, shellfish, peanuts, tree nuts,
egg, artificial colors, artificial sweeteners or preservatives.
Do not consume this product if you are pregnant or nursing.
1. Schurgers LJ, Spronk HM, Soute BA, Schiffers PM,
DeMey JG, Vermeer C. Blood. Regression of warfarininduced
medial elastocalcinosis by high intake of
vitamin K in rats 2007;109(7):2823-31.
2. Weber P. Management of osteoporosis: is there
a role for vitamin K? Int J Vitam Nutr Res 1997;67(5):350-6.
3. Geleijnse JM, et al. Dietary intake of menaquinone
is associated with a reduced risk of coronary heart disease:
the Rotterdam Study. J Nutr 2004;134(11):3100-5.
4. Beulens JW, High dietary menaquinone intake is
associated with reduced coronary calcification.
Atherosclerosis 2009;203(2):489-93. Epub 2008 Jul 19.
5. Kidd PM. Vitamins D and K as pleiotropic nutrients:
clinical importance to the skeletal and cardiovascular
systems and preliminary evidence for synergy.
Altern Med Rev 2010;15(3):199-222.
6. Plaza SM, Lamson DW. Vitamin K2 in bone metabolism
and osteoporosis. Altern Med Rev 2005;10(1):24-35.
7. Schurgers LJ, Teunissen KJ, Hamulyák K, Knapen MH,
Vik H, Vermeer C. Vitamin K-containing dietary
supplements: comparison of synthetic vitamin K1
and natto-derived menaquinone. Blood 2007;109(8):
3279-83. Epub 2006 Dec 7. -7.
8. Shearer MJ. Vitamin K metabolism and nutriture.
Blood Rev 1992;6(2):92-104.
9. Unpublished clinical studies, NattoPharma. On file
11. Kaneki M, Hodges SJ, Hosoi T, Fujiwara S, Lyons A,
Crean SJ, Ishida N, Nakagawa M, Takechi M, Sano Y,
Mizuno Y, Hoshino S, Miyao M, Inoue S, Horiki K,
Shiraki M, Ouchi Y, Orimo H. Japanese fermented
soybean food as the major determinant of the
large geographic difference in circulating levels of
vitamin K2: possible implications for hip-fracture risk.
Nutrition 2001; 17(4):315-21.
12. Ushiroyama T, Ikeda A, Ueki M. Effect of continuous
combined therapy with vitamin K(2) and vitamin D(3)
on bone mineral density and coagulofibrinolysis
function in postmenopausal women.
Maturitas 2002; 41(3):211-21.
13. Geleijnse JM, Vermeer C, Grobbee DE, Schurgers LJ,
Knapen MH, van der Meer IM, Hofman A, Witteman JC.
Dietary intake of menaquinone is associated with
a reduced risk of coronary heart disease: the Rotterdam
Study. J Nutr 2004; 134(11):3100-5.
14. Beulens JW, van der A DL, Grobbee DE, Sluijs I, Spijkerman
AM, van der Schouw YT. Dietary phylloquinone and
menaquinones intakes and risk of type 2 diabetes.
Diabetes Care 2010; 33(8):1699-705.
15. Choi HJ, Yu J, Choi H, An JH, Kim SW, Park KS, Jang HC,
Kim SY, Shin CS. Vitamin K2 supplementation improves
insulin sensitivity via osteocalcin metabolism: a
placebo-controlled trial. Diabetes Care 2011; 34(9):e147.
16. Shea MK, Booth SL, Massaro JM, Jacques PF, D’Agostino
RB Sr, Dawson-Hughes B, Ordovas JM, O’Donnell CJ,
Kathiresan S, Keaney JF Jr, Vasan RS, Benjamin EJ. Vitamin K
and vitamin D status: associations with inflammatory
markers in the Framingham Offspring Study.
Am J Epidemiol 2008; 167(3):313-20.
17. Iijima H, Shinzaki S, Takehara T. The importance of
vitamins D and K for the bone health and immune
function in inflammatory bowel disease. Curr Opin Clin
Nutr Metab Care 2012; 15(6):635-40.
18. Checker R, Sharma D, Sandur SK, Khan NM, Patwardhan
RS, Kohli V, Sainis KB. Vitamin K3 suppressed inflammatory
and immune responses in a redox-dependent manner.
Free Radic Res 2011; 45(8):975-85. Epub 2011 Jun 9.