Can’t we just consume lots of vitamin K1?
As mentioned earlier, animals do have the ability to convert vitamin K1 to vitamin K2 MK-4, but the conversion rates vary widely. (38, 39) In humans, the conversion rate is relatively unknown. Regardless, most people are deficient in vitamin K, hence infants in the United States are given a shot of vitamin K1 at birth to aid blood clotting. Furthermore, many drugs inhibit the conversion of vitamin K1 to K2, including cholesterol-lowering drugs (statins), osteoporosis drugs (alendronate, zoledronate), and blood thinners (warfarin). From the studies reviewed above, it’s clear that vitamin K2 intake itself is associated with many health benefits, regardless of vitamin K1 intake. Therefore, I wouldn’t rely solely on vitamin K1 intake to maintain healthy K2 status. Source
One true test to tell if you have enough Vitamin K2 is the quality of the plaque on your teeth. If you have a hard plaque you are deficient but if you have no plaque you have are sufficient.
http://healthyeating.sfgate.com/humans-convert-vitamin-k1-vitamin-k2-11895.html
I can see that at some stage it is true but as people grow older their ability to process nutrients drop.
One true test to tell if you have enough Vitamin K2 is the quality of the plaque on your teeth. If you have a hard plaque you are deficient but if you have no plaque you have are sufficient.