Koch's achievements, along with the performances of many other East German female athletes, have long been under suspicion that they were achieved with the aid of performance-enhancing drugs.  These drugs were and remain illegal, but were not detectable at the time. In 1991, German anti-drug activists Brigitte Berendonk and Werner Franke , were able to save several doctoral theses and other documents written by scientists working for the East German drug research programme. The documents list the dosage and timetables for the administration of anabolic steroids to many athletes of the former GDR, with one of them being Marita Koch. According to the sources, Koch did use the anabolic steroid Oral-Turinabol (4-Chlorodehydromethyltestosterone) from 1981 to 1984 with dosages ranging from 530 to 1460 mg/year. 
No matter which Turinabol dosage you choose, remember that it will suppress your body’s ability to make its own testosterone. As such, you should always pair Tbol with some form of testosterone. Most people prefer to use anywhere from 300mg to 500mg of testosterone enanthate each week; because of its long half-life, it requires only minimal injections. What’s more, because Turinabol has such a short half-life, most users find that splitting the daily dose into two smaller doses taken precisely 12 hours apart helps to reduce the occurrence of undesirable side effects. Just be sure to take your last dose at least four hours prior to going to bed in order to avoid sleeplessness.