I take natto almost on a daily basis to balance warfarin intake. Normally I take one teaspoon which provides about 115 mcg of vitamin K2 MK-7. If my INR is on low end of my therapeutic range I don't take any but never more than one tsp.
Of course no one I know can stand it except my...
See if you can figure a way to measure INR without a blood sample. Think of a method like a continuous glucose monitor uses or an O2 saturation monitor.
I did an analysis on this including the mechanism on how alcohol might affect INR a few years ago. Whereas warfarin works slowly with a half-life of about 40 hours if I'm remembering correctly; alcohol is metabolized in a linear process in a matter of a few hours, then it's effects on warfarin...
Vitamin K1 definitely lowers INR in a dose-related manner. It's just a matter of degree. If it didn't, it would not be the go-to antidote to warfarin overdose. So why don't some people notice it? With small doses its effects are easily overwhelmed by confounding variables such as medications...