I haven't heard this about vitamin K before - please correct me if I'm wrong, but I don't think we know how the mechanism through which vitamin K reduces skeletal fractures.
Search on that page for: "Skeleton and Bone Metabolism".
K1 and K2 work differently. We know a lot but there is still a lot more we don't know. Hell, looks like even different versions of K2 (from MK-4 to MK-13) works for different stuff in body. Only because MK-7 stays in blood for longer than MK-4 doesn't mean that it better. It could also mean that body is better in utilizing MK-4, or even that it's using it for different stuff.
Personally I don't know better source with information about different supplements than examine.com, more how they are working here: https://examine.com/about/
If you know better source point it to me, please. This university page you provided is short and old.
Just one question: what's wrong with using dotcom domain?
If examine.com's metaanalsyses are based on legitimate research papers -- and you've read some of the papers yourself and find that they indeed provide support for the article citing them -- then i'd say yeah, use the site.
i guess to respond to your question: most biomedical research today is eminating from universities and university-affiliated entites. page for page, i generally wouldn't expect a .com web site -- the majority of which are probably just attempting to generate advertising revenue -- to be on par in terms of accuracy etc with a .edu site. generally, I've found one of the best ways to improve the signal-to-noise ratio is to filter to a specific set of domains (e.g., ,edu, .gov) when searching online.
