I have been taking Bovine Colustrum for a year now as suggested by the rheumitologist I was seeing before I was finally diagnosed with CFS / ME. I just recently saw messages from others in the UK that "Transfer Factor" is a fairly common supplement that folks take over there to treat viral-caused CFS. Do any folks on this message board take it? Do your Drs advise it? Anyone taking it that is taking Valtrex? I am asking because the Dr I am seeing that perscribed the Valtrex doesnt want me to mix other medicine with it although I am taking the general colustrum.