What Progesterone Has to Do With Your Depression?
- Umu Coomber-ARNP-PMHNP-BC
- May 11
- 3 min read
It's Not Low Serotonin — It's Your Progesterone
The "chemical imbalance" narrative — specifically the idea that depression equals low serotonin — became enormously popular largely because it was marketable, not because it was rigorously proven. A landmark 2022 review published in Molecular Psychiatry by Moncrieff et al. found no consistent evidence that people with depression have lower serotonin levels or activity. That was a significant moment because it challenged decades of pharmaceutical messaging.
The reality is that depression is likely a heterogeneous condition — meaning different people experience what looks like the same disorder through very different biological pathways.
Progesterone as a Neurosteroid (brain neurons steriod or fertilizer) — This is Underappreciated
Progesterone isn't just a reproductive hormone — it's a neurosteroid, with direct effects on the brain:
How progesterone works neurologically:
It metabolizes into allopregnanolone, which acts on GABA-A receptors — the same receptors targeted by anti-anxiety medications like benzodiazepines. This is literally a built-in calming mechanism.
It has anti-inflammatory effects in brain tissue
It supports myelin (nerve insulation) and overall neuroprotection
So when progesterone drops — whether during the luteal phase, perimenopause, postpartum, or under chronic stress — you're not just losing a reproductive hormone. You're losing a natural anxiolytic and mood stabilizer.
The Cortisol-Progesterone Competition
This is one of the most clinically significant and least discussed dynamics. Progesterone and cortisol share a precursor — pregnenolone. Under chronic stress, the body essentially steals pregnenolone to make more cortisol, leaving less available for progesterone production. This is sometimes called "pregnenolone steal" or the cortisol-progesterone competition.
The result: chronic stress doesn't just make you feel bad psychologically — it biochemically depletes a hormone that was protecting your mood.
Why This Gets Missed
Several factors contribute to this being underdiagnosed and undertreated:
Testing gaps — standard depression workups almost never include progesterone, testosterone, DHEA, or thyroid panels beyond basic TSH. Yet all of these have documented connections to mood.
Old school of thought framing — SSRIs are heavily researched and marketed. Old mono amine neurotransmitter approach over systemic impact of hormonal on brain and mental health.
Dismissal of women's hormonal experiences — historically, women reporting mood changes tied to their cycles were told it was "just hormones" as a way of minimizing, rather than investigating, what those hormones were actually doing.
What a More Complete Approach Looks Like
For someone whose depression may be hormonally driven, a thorough workup might include:
Progesterone
Estrogen/estradiol
Free and total testosterone
DHEA-S
Full thyroid panel (TSH, free T3, free T4, reverse T3)
Cortisol
Vitamin D (acts more like a hormone than a vitamin, and deficiency is strongly linked to depression)
Treatment then becomes targeted — addressing the actual deficiency rather than broadly suppressing neurotransmitter reuptake without understanding the root cause.
It is difficult to treat a condition when the underlying biological drivers remain hidden. If you feel your depression hasn't responded to standard care, it may not be that you are 'resistant' to treatment—it may be that your hormonal ecosystem, including neurosteroids like progesterone, is still waiting to be balanced.
If you are struggling with depression and need a new lens approach to your mental health, please request appointment below
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This information is for educational purposes and does not replace personalized medical advice. Always consult your healthcare provider before starting, stopping, or changing any medication.
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