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To date, however, no evidence has been uncovered to show that 19-nortestosterone is produced endogenously, despite the fact that tens of thousands of urine samples have been analyzed since 1980 using capillary column chromatography coupled with mass spectrometry. ben johnson steroids, medical steroids, anabolic steroid injections, steroid encyclopedia, anabolic supplement review, list of steroids, steroid dosages, before and after using steroids photos, pictures of steroid abuse, muscle Lou ferrigno steroids. There is still the possibility, however, that increasing the sensitivity of a test for a synthetic steroid like 19-nortestosterone, will increase the possibility of detecting trace amounts of the same steroid produced naturally by minor pathways. It is imperative that sizable drug free populations be checked out by any new improvements in techniques. (I have Dr. ben johnson steroids, medical steroids, anabolic steroid injections, steroid encyclopedia, anabolic supplement review, list of steroids, steroid dosages, before and after using steroids photos, pictures of steroid abuse, muscle Buy injectable anabolic steroids. R. V. Brooks, a chemical endocrinologist at St. ben johnson steroids, medical steroids, anabolic steroid injections, steroid encyclopedia, anabolic supplement review, list of steroids, steroid dosages, before and after using steroids photos, pictures of steroid abuse, muscle Physical effects of steroids. Thomas's Hospital Medical School, to thank for some of the above information on 19-nortestosterone. )It is also possible that the use of testosterone and/or other anabolic steroids which aromatize, and/or human chorionic gonadotropin (HCG) may increase the endogenous production of estrogens and therefore possibly the intermediate 19- nortestosterone, thus raising the level of endogenously produced 19-nortestosterone above the detection threshold. For example the use of say Dianabol before a drug tested competition might raise the endogenous level of 19-nortestosterone. Thus the athlete might escape detection of the anabolic steroids he was using (if he stopped them early enough) but may be found positive for 19- nortestosterone - even though he may never have used the 19-nortestosterone. Perhaps the concomitant widespread use of supplements in the sports with the highest incidence of anabolic steroid use (the so called "loaded sports" - powerlifting, weightlifting, bodybuilding and track and field - especially the throwing and sprinting events) may be somehow responsible for increasing endogenous nortestosterone production (possibly as a result of changes in the synthesis, secretion and metabolism of other hormones). Later on in 1986, in Update Three, I wrote:The Endogenous Production of 19-nortestosteroneAs stated in Update Two there are several pathways by which 19-nortestosterone can be formed endogenously in the human body. Recently studies have shown that 19-nortestosterone is endogenously produced in other mammals besides the horse. 19-norandrostenedione was first isolated from ovarian follicular fluid of horses by R. Short in 1960. 1 Recently the presence of 19- norandrostenedione has been found as a major steroid in porcine ovarian follicular fluid,2 with 19-nortestosterone as a minor component4. In the two previous studies it was found that the levels of both compounds were highest in preovulatory and large follicles. 19-nortestosterone was also reported as a minor component in horse ovarian follicular fluid,5 horse testis and pig testis. 6There is one report of the formation of 19- nortestosterone and 19-norandrostenedine from testosterone by baboon placental microsomes. 7 There is also another report that 19- nortestosterone can be formed from testosterone by mouse kidney slices. 8Nevertheless, there is still no evidence that 19- nortestosterone is produced endogenously in man - at least not in concentrations that are detectable by present analytical means. Many studies including two recent ones done in the U. S. 9 and U. K. 10, have shown that the hydroxylations, oxidation and decarboxylation processes involving testosterone and leading to estrogens, occur at the same or adjacent enzymatic sites, with the intermediates remaining on the enzymes. Any intermediates, such as 19- nortestosterone, would therefore be very short lived and likely would not accumulate in any appreciable concentrations. Thus it seems that the rapid conversion of 19- nortestosterone prior to tissue distribution and excretion, normally does not allow its detection in body tissues or fluids. I feel that it is logical to assume that 19- nortestosterone is in fact produced as an intermediate compound in humans but that normally no accumulation of the compound occurs due to the rapidity of the aromatization process. Or if there is an accumulation then it is likely in amounts which are below the present detection limit, which is about 0. 25 nanograms/milliliter of urine for most steroids.
Ben johnson steroids, medical steroids, anabolic steroid injections, steroid encyclopedia, anabolic supplement review, list of steroids, steroid dosages, before and after using steroids photos, pictures of steroid abuse, muscle
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