> K1 is probably a little less active than K2. > [MK-4 vs. MK-7] Taking the vitamin with a meal, it will absorb slowly and steadily, and I don't think will make much difference. > [±25g of spinach and 5-10g of beef liver enough to counteract blood thinning effects of [[aspirin]]] I think that amount of liver and spinach is likely to be enough. > [Baby [[Aspirin]]] Vitamin K is good for protecting muscles and bones, so 500 micrograms to one milligram is good anyway, and it would be protective against even more [[aspirin]]. > [Are you aware of any reason why K2 could cause bad abdominal discomfort? I took 2mg orally with food last night and today have had severe abdominal pain in my lower right side, as well as nausea and multiple large stools.] I had a similar experience, and thought it might be the excipient oil, so I’ve used it only on my skin since then.