I believe most anabolic steroids increase clotting time (prothrombin time). It is written in the literature on all steroids I've read about. Turinabol is similar to Dianabol, except for the fact it has a Chlorine attached to a carbon side chain which prevents it from aromatising. I've used Turinabol, and love it. I didn't notice that it increased clot time any more than any other steroids I've used. If you're having serious clotting issues check with your doctor.