Potassioum citrate has been found to stop blood cells clumping together because it increases their surface charge.  Work by Riddick showed it has a similar result to using Heparin.  Has anyone used this to replace Warfarin.  The only disadvantage is that you need to drink 1 to 1.5 litres of water with the citrate a day, but there does not seem to be any other side effects as with Warfarin.  Geoff