Found this on his website:
"However, although red root does increase coagulation, in the doses I suggest it should not be a problem. Additionally, many of the herbs—andrographis and cat’s claw for example, are reliable blood thinners that inhibit blood clotting. Knotweed also facilitates blood flow through other mechanisms.
These herbs are more than enough to counteract any clotting actions of red root and should easily—if hypercoagulation does indeed occur—reverse that condition in the doses listed."
buhnerhealinglyme.com/herbs/red-root-and-hypercoagulation/