Let’s talk about progesterone-only therapy

FROM DR. BERZIN:

A progesterone-only approach to hormone replacement therapy isn’t right for everyone, but HRT without estrogen is a meaningful clinical option for some.

Below, read about five scenarios where we might consider progesterone-only therapy during perimenopause and menopause, and why individualized evaluation always matters.

— Robin Berzin, MD, Founder & CEO, Parsley Health

HRT Without Estrogen?
5 Examples of Progesterone-Only Therapy in Practice

Before prescribing any form of HRT, your doctor should establish a two-way clinical relationship that explores your symptoms, ovulatory status, menstrual history, cardiovascular risk, and breast health over a period of time.

It’s not appropriate for every woman, but for some, especially those in perimenopause, progesterone without estrogen relieves symptoms.

Here are five clinical scenarios where we may consider progesterone-only therapy:

1. You’re in perimenopause, and your cycles have become irregular
As ovulation becomes less predictable in perimenopause, progesterone levels often decline earlier and more erratically than estrogen. This can contribute to heavy periods, spotting, shortened cycles, and breast tenderness.

Why we consider it: Progesterone helps stabilize the uterine lining after ovulation. Cyclic progesterone therapy may support more predictable shedding patterns and reduce irregular bleeding in some women.

2. Your sleep is suffering, not because of hot flashes
Clinical trials have shown improvements in sleep quality with bedtime oral micronized progesterone in some perimenopausal and postmenopausal women.

Why we consider it: Progesterone is metabolized into neuroactive compounds that interact with calming GABA receptors in the brain, which may help support relaxation, sleep onset, and sleep maintenance.

Read More: How to Increase Progesterone Naturally & Medically

3. Your mood shifts follow a cyclical pattern
A luteal phase drop in progesterone can cause irritability, anxiety, and emotional sensitivity to intensify in the second half of your cycle.

Why we consider it: Progesterone fluctuations can influence neurotransmitters involved in mood regulation. In select cases, supporting progesterone levels may help smooth hormone-related mood shifts. Responses are highly individualized, though, and some women may actually feel more emotionally sensitive on progesterone.

4. Estrogen isn’t an option for you
Certain women may not be candidates for estrogen-containing therapy due to clotting disorders, estrogen-sensitive cancers, migraine patterns, or specific cardiovascular risks.

Why we consider it: Progesterone acts differently from estrogen and may still provide support for symptoms like sleep disruption or cycle irregularity in carefully selected cases. That said, avoiding estrogen does not automatically make progesterone the right choice — individualized oversight is essential.

5. You’re in early perimenopause and not yet estrogen-deficient
Not every woman in perimenopause needs full hormone replacement therapy. If symptoms are relatively mild — like early sleep disruption, cycle changes, or hormonal mood shifts — clinicians may sometimes begin with lower-intervention approaches before considering estrogen.

Why we consider it: In early perimenopause, the issue is often hormonal fluctuation and inconsistent ovulation rather than complete estrogen loss. Progesterone may help address this imbalance without introducing systemic estrogen when it’s not yet needed.

With any therapy or treatment, the safest approach is always personalized care guided by symptoms, labs, and a full understanding of your health history.

Read More: What to Know Before Taking Progesterone Without Estrogen