Been digging through studies to answer my own question, here's what I've found:
Full text of study - http://onlinelibrary...107.002683/full
Both groups showed profound suppression of spermatogenesis initially (Figure 2). At 12 weeks, 8 of 10 subjects (80%) in the MENT group and 13 of 16 (81%) in the testosterone group demonstrated suppression to less than 1 × 106/mL, with 3 and 11 subjects, respectively, being azoospermic. Thereafter, suppression was inconsistent in the MENT group. Only 4 men maintained less than 1 × 106/mL until 24 weeks, whereas the others showed partial recovery. Overall the mean sperm concentration rose to 11.5 × 106/mL ± 5.2 × 106/mL at that time.
In contrast, the testosterone group showed maintained suppression. At 24 weeks, 14 of 16 subjects (88%) were azoospermic, and by the end of the treatment period all subjects demonstrated azoospermia (n = 14). One of the 2 men not azoospermic at 24 weeks withdrew from the study for personal reasons, and the other became azoospermic at week 44. The range of time to achieve azoospermia was therefore 4–44 weeks (median, 12 weeks). Once azoospermic, sperm were detected only in the centrifuged pellet of the ejaculate in 1 individual on 1 occasion.
Recovery was rapid following implant removal in the MENT group, with 9 of 10 subjects achieving sperm concentration of more than 20 × 106/mL within 16 weeks. Slower recovery was seen in the testosterone group, with a median duration of 28 weeks. One subject continued to show sperm concentrations of 10 × 106/mL–15 × 106/mL after more than 1 year of follow-up, with normal total sperm number, motility and morphology, and gonadotropin concentrations. A second subject underwent vasectomy before his sperm concentration had recovered to more than 20 × 106/mL, 64 weeks after removal of etonogestrel implants.
Yes it's about ment, but we can assume it applies to at least some degree to trestolone.
- Testosterone induced azoospermia quicker in more guys than ment
- After 4 weeks, some men on ment had their sperm and FSH levels start to recover - while still taking ment!
- Testosterone maintains suppression better than ment
- Guys recovered more quickly from ment than testosterone
These guys used ment for up to 24 weeks. Obviously the dosages are less than for bodybuilding purposes, but this study makes these claims of permanent infertility due to ment or trest seem ridiculous.
Open to agreeing and dissenting studies.