Puberty Blockers and Fertility: A Sourced Guide for Families

TransHealthHub

Sep 8

4 min read

Bell jar with various hormone-related images inside, with a seed planted and a calendar outside

Key Takeaways

Puberty blockers and fertility are among the most common questions families ask, and the answer depends on when treatment starts and what follows.
Puberty-pausing medication does not destroy reproductive tissue. It pauses the hormonal signal that matures eggs and sperm, and that signal resumes when the medication stops.
The complication is sequence. A young person who starts early and moves directly to hormone therapy may never have produced mature eggs or sperm, which narrows the standard preservation options.
The American Academy of Pediatrics recommends access to this care and states in the same policy that the fertility effect of sustained puberty suppression is unknown.
Counseling is meant to come first. The American Society for Reproductive Medicine says postpubertal minors should be offered sperm banking or egg freezing.
Uptake is low. Among 132 patients at one U.S. pediatric gender clinic, 6.8% underwent a preservation procedure.
This medication is also called puberty suppression or puberty-pausing medication; all three names refer to the same treatment.

The short answer

Puberty blockers pause the hormonal signal that drives puberty, and egg and sperm maturation pauses along with it. If the medication stops and no other treatment follows, that signal restarts. What makes the fertility question harder is what usually comes next: if puberty-pausing medication is followed directly by hormone therapy, a young person may reach adulthood without ever having produced mature eggs or sperm, and the usual ways of banking them depend on that.

At TransHealthHub, we find this is where families most often get a confident answer in either direction and deserve a careful one instead.

What the medication does, and does not, do

The medication does not remove or damage ovaries or testes. It interrupts the signal from the brain that tells them to mature eggs and sperm, which is why clinicians describe the pubertal effects as reversible.

A reversible pause is not the same as no consequence for fertility. Writing in Nature Reviews Urology in 2020, Leonidas Panagiotakopoulos and colleagues were plain: blockade of puberty does affect future fertility options for transgender adults treated early in adolescence, and patients should be counseled about the options available to them. The effect is on options, and it runs through timing.

Why timing matters so much

Standard fertility preservation works on mature eggs and sperm. Sperm banking needs sperm; egg freezing needs eggs that have gone through pubertal maturation. Both require puberty to have progressed far enough to produce them.

When treatment starts	What this usually means for preservation
Later in puberty, after gametes have matured	Established options such as sperm banking or egg freezing are generally available
Early in puberty, then straight to hormone therapy	Mature eggs or sperm may never develop, so established options may not apply
Before puberty begins	Only tissue freezing, described as investigational

The American Society for Reproductive Medicine, in a 2021 Ethics Committee opinion published in Fertility and Sterility, states that postpubertal minors should receive fertility preservation counseling and be offered sperm banking or oocyte cryopreservation. The same opinion notes that prepubertal testicular tissue cryopreservation is considered investigational.

This is why counseling is meant to happen before treatment starts. A pause can be lifted, but a conversation about preservation is more useful early than late. Our page on what reversible means here covers that distinction in more depth.

What research on puberty blockers and fertility actually shows

Less than families are usually told. A 2025 systematic review in Frontiers in Endocrinology by Gianluca Tornese and colleagues assessed 51 studies of gonadotropin-releasing hormone agonists in transgender and gender-diverse adolescents. On mental health and puberty suppression, it found usable evidence. On fertility, it found none of moderate or high quality, and named reproductive outcomes as an area where long-term safety remains uncertain.

Two things are true together, and the American Academy of Pediatrics says both. Its policy statement, reaffirmed in 2023, calls for access to comprehensive, developmentally appropriate care. The same document says the fertility effect of sustained puberty suppression is unknown, and that fertility may be decreased when hormone therapy follows without an intervening puberty. Thin evidence is a reason for counseling, not a finding of harm.

What happens in practice

Counseling and uptake are different things. In a 2022 study in PLOS ONE, Holly Cooper, Jin Long, and Tandy Aye reviewed records for 132 patients at a U.S. pediatric and adolescent gender clinic. Of those with a documented fertility preservation discussion, 24% accepted a referral, and 6.8% overall went on to a preservation procedure, nine people in total.

Cost, timing, and how a young person feels about the procedures all weigh on that choice. The figures describe one clinic's patients, not all families.

Frequently asked questions

Do puberty blockers cause permanent infertility? Not on their own. The pause in egg and sperm maturation lifts when the medication stops. The harder question is what follows, and long-term data are limited.

When should fertility come up? Before treatment starts, which is what U.S. guidelines direct.

What if my child started before puberty? Established preservation options generally do not apply, and tissue freezing is investigational. This is a question for a clinical team.