Masteron Enanthate and Male Fertility
Among all the consequences of using anabolic steroids, the effect on fertility is one of the least noticeable «from the outside» and at the same time one of the most sensitive for a man planning children. The editorial team explains why drostanolone enanthate, like other androgens, is capable of sharply reducing the sperm count, how reversible this is, and what andrologists advise.
How androgens switch off spermatogenesis
Spermatogenesis is controlled by two pituitary hormones. FSH acts on the Sertoli cells that «nurse» the sperm, while LH stimulates the Leydig cells to produce testosterone. For normal sperm maturation, the testosterone concentration inside the testicles must be many times higher than in the blood.
When an exogenous androgen enters the body, the hypothalamus and pituitary react to it as an excess of hormone and reduce the secretion of GnRH, LH, and FSH. Intratesticular testosterone falls, and with it the production of sperm, despite the high level of androgens in the blood.
It is precisely this mechanism that scientists used in research on hormonal male contraception. In a large multicenter WHO study, weekly injections of testosterone enanthate led to azoospermia — the complete absence of sperm in the ejaculate — in most healthy men.
Drostanolone acts through the same androgen receptors in the hypothalamus and pituitary, so there is no reason to believe that it affects fertility «more gently». The absence of aromatization does not save the situation: the androgenic signal is sufficient to suppress the axis.
The role of the enanthate form
Enanthate is a long ester that ensures a prolonged release of the substance from the depot. For the hormonal axis this means a continuous inhibitory signal, without «windows» in which the pituitary could partially restore secretion.
After injections stop, the substance continues to be released from the depot for some time, so the countdown to recovery begins not from the day of the last injection, but later.
Fertility is additionally affected by the combination of several substances. Most people who use drostanolone simultaneously use testosterone and other androgens, so the suppression is usually deeper and longer.
No less important is the duration of use: studies of anabolic steroid users show that longer and more intense use is associated with slower recovery of the hormonal axis.
Are the changes reversible
Data on recovery come mostly from two sources: studies of hormonal contraception, where healthy volunteers were given controlled doses of drugs, and observations of anabolic steroid users.
An integrated analysis of male hormonal contraception studies showed that after the injections stopped, spermatogenesis recovered in the vast majority of participants, most often within a few months, and in individual cases — up to two years. The speed depended on age, the duration of treatment, and other factors.
However, these results cannot be transferred directly to non-medical use: the contraceptive studies used a single substance in controlled doses in carefully selected healthy men, whereas the real regimens of users often include several drugs in supraphysiological amounts.
In clinical practice, andrologists describe cases of prolonged azoospermia and hypogonadism after anabolic steroids that require treatment. So reversibility is a probability, not a guarantee.
| Factor | Effect on recovery |
|---|---|
| Duration of use | Longer — slower recovery |
| Number of substances and doses | More — deeper suppression |
| Age | Older age — slower |
| Baseline fertility | Prior disorders worsen the prognosis |
Diagnosis: what tests are needed
The main method of assessing male fertility is a semen analysis performed in accordance with WHO standards. It evaluates the ejaculate volume, concentration, motility, and morphology of the sperm.
Since the full cycle of sperm maturation takes about 74 days, and some more time is needed for transport through the epididymis, the results of a semen analysis reflect the state of a few months earlier. To assess the dynamics, the tests are repeated at intervals determined by the doctor.
- Semen analysis (repeated if necessary).
- LH, FSH, total testosterone, estradiol, prolactin.
- Examination by an andrologist, assessment of testicular volume.
- Ultrasound of the scrotal organs if indicated.
Low LH and FSH together with low testosterone after discontinuation indicate persistent suppression of the axis. Conversely, high FSH with azoospermia may indicate primary testicular damage, and then the prognosis is different.
A reduction in testicular volume is a common external marker of suppression, which users themselves also notice. It usually partially recovers together with hormonal function.
What andrologists advise
The main recommendation is simple: for men who are planning parenthood in the near future, anabolic steroids are contraindicated by their very action. Even medical testosterone therapy is not recommended for those planning conception, which is stated directly in clinical guidelines.
If fertility is already reduced, an andrologist may consider drug stimulation of spermatogenesis. The choice of drugs, their doses, and duration are determined individually; the editorial team deliberately does not give regimens, since self-administration can be harmful.
Sperm cryopreservation is an option for those who value future fertility, but it makes sense only before the effect on spermatogenesis.
One should also not forget the general factors of male fertility: smoking, alcohol, overheating, obesity, and sleep deprivation also worsen sperm quality.
For more on related topics, read our materials «Recovery of the body after using masteron propionate», «Masteron enanthate and the prostate: what the research says», and «Masteron enanthate and the psyche: mood, aggression, sleep».
Editorial conclusions
Drostanolone enanthate, like other androgens, suppresses the secretion of LH and FSH and can reduce spermatogenesis down to azoospermia.
The prolonged action of the enanthate form and the combination of several substances deepen and lengthen the suppression.
Recovery is possible in most cases, but it may take months or years, and in some men it requires treatment.
Men who are planning children should discuss the state of their fertility with an andrologist and undergo examination, first of all a semen analysis.
References
- World Health Organization Task Force on Methods for the Regulation of Male Fertility. Contraceptive efficacy of testosterone-induced azoospermia in normal men. Lancet. 1990;336(8721):955–959.
- Liu PY, Swerdloff RS, Christenson PD, et al. Rate, extent, and modifiers of spermatogenic recovery after hormonal male contraception: an integrated analysis. Lancet. 2006;367(9520):1412–1420.
- Rahnema CD, Lipshultz LI, Crosnoe LE, et al. Anabolic steroid-induced hypogonadism: diagnosis and treatment. Fertil Steril. 2014;101(5):1271–1279.
- Coward RM, Rajanahally S, Kovac JR, et al. Anabolic steroid induced hypogonadism in young men. J Urol. 2013;190(6):2200–2205.
- World Health Organization. WHO laboratory manual for the examination and processing of human semen. 6th ed. Geneva: WHO; 2021.
- Bhasin S, Brito JP, Cunningham GR, et al. Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2018;103(5):1715–1744.
Andriy Melnyk
A strength-sports coach and author of programs for beginner and intermediate levels. Writes about training planning.
