Local Brain Estrogen Synthesis
The brain makes its own estradiol from testosterone, in neurons and astrocytes, independently of what the testes supply. This single fact is why a blood estradiol reading does not tell you what the brain has, and why an aromatase inhibitor is a different kind of intervention from simply having low testosterone.
Relationships
6 connectionsLocal Brain Estrogen Synthesis stimulates
Astrocyte
The support cell that feeds neurons and clears glutamate from the synapse. It also expresses aromatase, which means part of the brain's own estrogen supply comes from glia.
Dendritic Spine Density
How many connection points a neuron carries. Spines appear and disappear over hours, and their number is the physical substrate of how much a circuit can currently hold. Estradiol raises spine density in hippocampal CA1, and the effect tracks the hormone.
Hippocampus
Where new memory is laid down. Unusually sensitive to sustained cortisol and to lost deep sleep, both of which these compounds can produce, which makes it the structure behind most reported memory complaints.
Libido
Sexual desire. Needs androgen, a workable estradiol level and prolactin that is not elevated, so it fails from several directions at once.
Medial Preoptic Area
The most aromatase-rich region in the male brain. Testosterone is converted to estradiol here before it acts, which means much of what looks like an androgen effect on sexual behaviour is an estrogen effect one step downstream.
Memory Consolidation
Turning the day's experience into durable memory, which happens during deep and REM sleep. This is the step that breaks first when sleep breaks, and it is why memory complaints on these compounds usually trace back to sleep.
Beyond this page
Local Brain Estrogen Synthesis also connects to 5 entries in the applied modules, covering supplements, compounds, hormones and food sources. Those carry the mechanism and the evidence tier behind each link, and they are part of client coaching.
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