Our Star Nutrients
Calcium’s secret weapon
How much do I need?
There is currently no recommended daily intake (RDI) for vitamin K2. The RDI for vitamin K is 80-120 mcg for adults, and 30-75 mcg for children ages 3 to 18.1
Why we include it
Vitamin K comes in a few different forms. Vitamin K1 – the form primarily responsible for blood clotting – is found in in green, leafy vegetables like kale and broccoli, and is relatively easy to get through the diet.
Vitamin K2 in the form of menaquinone-4 (MK-4) is found in meat, especially organ meats like liver. Vitamin K2 in the form of menaquinone-7 (MK-7) is only found naturally in large amounts in natto, a fermented soy product. It’s this MK-7 form of vitamin K that has clinically-proven bone-building properties2 and lasts the longest in the bloodstream3. It's also the most rare in the western diet.
That's why we include vitamin K2 in the premium synthetic form MK7 (menaquinone-7). However, our K2 is K2Vital, made by Kappa BioScience and manufactured in Denmark. We selected this form because it's soy free and makes our products have superior shelf-life stability.
- 3 oz natto – 939 mcg
- 3 oz blue cheese – 3 mcg (French) – 22 mcg (English)
- 3 oz beef liver – 3 mcg
- 3 oz pork liver – 3 mcg
- 3 oz cheddar cheese – 2 mcg
- 3 oz Leicester cheese – 2 mcg
- 3 oz Edam cheese – 1 mcg
Vitamin K is an important part of natural blood clotting. If you are taking Coumadin, Warfarin or a similar blood-thinning drug, be sure to consult your health care provider before taking any supplement that includes Vitamin K. We recommend you seek the advice of your pediatrician or primary care provider before making changes to you or your child’s nutrient intake.