I have just been having a discussion about this with a few guys on another board. I was basically being called a retarded asshole for stating that while I have never used it during post cycle therapy (pct) personally I have never seen any scientific evidence that convinced me that it would be overly harmful to do so. After some name calling, etc I posted the following study to support my argument. I think it is a good starting point.
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Int J Gynaecol Obstet. 1988 Feb;26(1):121-8. Links
The effect of mesterolone on sperm count, on serum follicle stimulating hormone, luteinizing hormone, plasma testosterone and outcome in idiopathic oligospermic men.
Varma TR, Patel RH.
Department of Obstetrics & Gynaecology, St. George's Hospital Medical School London, U.K.
Two hundred fifty subfertile men with idiopathic oligospermia (count less than 20 million/ml) were treated with
mesterolone (100-150 mg/day) for 12 months. Seminal analysis were assayed 3 times and serum follicle stimulating hormone (FSH) luteinizing hormone (LH) and plasma testosterone were assayed once before treatment and repeated at 3, 6, 9 and 12 months after the initiation of treatment. One hundred ten patients (44%) had normal serum FSH, LH and plasma testosterone, 85 patients (34%) had low serum FSH, LH and low plasma testosterone. One hundred seventy-five patients (70%) had moderate oligospermia (count 5 to less than 20 million/ml) and 75 patients (30%) had severe oligospermia (count less than 5 million/ml). Seventy-five moderately oligospermic patients showed significant improvement in the sperm density, total sperm count and motility following mesterolone therapy whereas only 12% showed improvement in the severe oligospermic group.
Mesterolone had no depressing effect on low or normal serum FSH and LH levels but had depressing effect on 25% if the levels were elevated. There was no significant adverse effect on testosterone levels or on liver function. One hundred fifteen (46%) pregnancies resulted following the treatment, 9 of 115 (7.8%) aborted and 2 (1.7%) had ectopic pregnancy. Mesterolone was found to be more useful in patients with a sperm count ranging between 5 and 20 million/ml. Those with severe oligospermia (count less than 5 million) do not seem to benefit from this therapy.
PMID: 2892728 [PubMed - indexed for MEDLINE]
http://www.ncbi.nlm.nih.gov/entrez/...t_uids=2892728&query_hl=4&itool=pubmed_docsum