We now are able to undertake studies on model bacterial membranes under conditions which much more closely resemble those found of live bacteria than has previous been possible. (ncl.ac.uk)
Most of the vitamin K2 produced in the intestine are embedded within bacterial membranes and not available for absorption. (wellnessmama.com)
Rather than the Vitamin K2 being available, it is embedded within bacterial membranes. (ketoendurance.co)