What is HRT?
This guide is harm-reduction information. It is not medical advice, and it is not a substitute for care from a qualified clinician. We provide it because most readers do not have access to an informed clinician — the goal is that anyone who is going to do this anyway does it as safely as possible. If you have access to a doctor who will work with you, see them first.
The basics
Hormone replacement therapy, or HRT, is the medical practice of changing the levels of sex hormones in your body. For trans people, HRT is one of the most powerful tools we have for aligning our body with our gender. It does not change everything — it cannot change height, voice (in the trans-feminine direction), or facial bone structure — but it changes a great deal.
The two main hormone classes used in HRT are:
- Estrogens (such as estradiol) — drive feminizing changes: softer skin, breast development, fat redistribution, reduced body hair growth, reduced muscle mass.
- Androgens (such as testosterone) — drive masculinizing changes: facial hair growth, voice deepening, fat redistribution, increased muscle mass, body hair growth, oily skin.
Your body already produces some level of both. HRT is about shifting the balance.
The two-component model
Trans-feminine HRT typically uses two medications together:
- An estrogen (most commonly estradiol) to drive feminizing changes.
- An antiandrogen to suppress your body’s existing testosterone production.
This is because estrogen alone, at safe doses, will not reliably suppress testosterone in someone with testes. Without an antiandrogen, your body keeps producing testosterone and the feminizing effects of estrogen are blunted.
Trans-masculine HRT is simpler in this regard: testosterone is given on its own. Testosterone naturally suppresses estrogen production through normal endocrine feedback.
What HRT will and will not change
HRT will change:
- Skin texture and softness
- Body fat distribution
- Muscle mass
- Body hair growth (slows or accelerates depending on direction)
- Breast tissue (grows on estrogen, atrophies on testosterone)
- Genital tissue
- Mood and emotional patterns
- Fertility (often permanently)
HRT will NOT change:
- Height
- Bone structure (face, hips, hands)
- Voice (in trans-feminine direction — voice training is needed)
- Existing facial hair (laser or electrolysis is needed)
- Adam’s apple (surgery is needed)
The first six to twelve months are when the most visible changes happen, but full changes can take two to five years. Patience is part of this.
A note on patience and despair
The first three months are often the hardest. Many people experience emotional intensity — sometimes joyful, sometimes overwhelming — as their endocrine system shifts. Visible changes are usually subtle in this period. It is easy to feel like nothing is happening.
The changes are happening. Skin is the first thing to soften, often within a few weeks. Mood usually stabilizes by month three or four. Breast development typically begins between month three and six. Trust the process, and please do not increase doses past safe limits because progress feels slow. Going faster does not work — your tissue can only respond at the rate it can respond.