Hoppy,
Great question... The short answer is while you may be getting sufficient vitamin K1 from dietary sources plus the Mature-Multi, you may not be getting enough vitamin K2 if you're not taking MK-7 or a mix of MK-4 and MK-7 supplements...
The nutrition experts at the Life Extension Foundation have formulated the Super K with Advanced K2 Complex with what they think is an optimum mix of:
vitamin K1 1000 mcg
vitamin K2 complex
MK-4 1000 mcg
MK-7 200 mcg
The history of vitamin K2 is relatively recent. The first reports of another vitamin K function beyond clotting started in 1979. In 2007, Schurgers et al show that natural vitamin K2 as Menaquinone-7 (MK-7) is the most bioavailable, bioactive and longest lasting form of vitamin K.
The first study of vitamin K2 registered with clinicaltrials.gov started in 2006. 34 vitamin K2 studies have been registered in clinicaltrials.gov since then with 22 studies in the last 5 years. The majority of these studies were conducted at the Maastricht University Medical Center, the Netherlands.
Some of the most informative articles on vitamin K2 come from Dr. Mercola, MD and Dr. Kate Rheaume-Bleue, ND...
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"Vitamin K1 exclusively participates in blood clotting — that's its sole purpose. K2 on the other hand comes from a whole different set of food sources, and its biological role is to help move calcium into the proper areas in your body, such as your bones and teeth."
"Vitamin K2 is needed throughout pregnancy, and later while breastfeeding. It may be particularly important during the third trimester, as most women's levels tend to drop at that time, indicating there's an additional drain on the system toward the end of the pregnancy. Since vitamin K2 has no toxicity issues, it may be prudent to double or even triple — which is what Rheaume-Bleue did during her own recent pregnancy — your intake while pregnant."
Mercola and Rheaume-Bleue tend to favor taking additional vitamin K2 (MK-7) when taking vitamin D3 at 5,000 to 10,000 IU/day.
Hope this helps.
Take care,
V/R, Batch