Hormonal substrate — testosterone, estrogen, prolactin, thyroid
One of 4 mechanistic pathways to ❤️🔥 Libido & sexual function · 17 options
Testosterone sets the floor under desire in both sexes. Estrogen matters for arousal and comfort in women and for libido in men, which surprises people. Prolactin and thyroid are the two most commonly missed causes, and both are a single blood test away.
Both ends of the estradiol range kill libido in men, which is why crushing it with an aromatase inhibitor so often makes things worse. Use the sensitive assay — the standard one is unreliable at male concentrations.
Total TestosteroneFree TestosteroneSHBG (Sex Hormone-Binding Globulin)Estradiol, Sensitive (LC/MS-MS)ProlactinTSH (Thyroid-Stimulating Hormone)DHEA-S❤️🔥 ED & Low Libido covers these in one panel →
What engages this pathway
Ordered by how directly each one acts on the mechanism above — never by how much trial evidence exists. Each links to its full breakdown with dosing, half-life and vendor.
💉 Enclomiphene
Raises endogenous testosterone by blocking pituitary estrogen feedback, without shutting down the axis or fertility.
💉 HCG
Direct LH mimicry at the Leydig cell. Often restores libido on TRT specifically because it restores intratesticular testosterone, which injections alone do not.
💉 Kisspeptin
The furthest-upstream stimulus to the whole axis.
💉 Gonadorelin
Pulsed GnRH to drive endogenous LH and FSH.
💉 Anastrozole
Aromatase inhibition. Crushing estradiol destroys libido in men just as reliably as high estradiol does — the relationship is a U-curve and overcorrection is the most common self-inflicted cause of low libido on TRT.
💉 Cabergoline
Prolactin suppression. Prolactin rises after orgasm and creates the refractory period; chronically elevated, it flattens desire entirely.
🧬 DHEA
A precursor to both testosterone and estrogen, and the best evidence is in women — vaginal DHEA is approved for genitourinary syndrome of menopause, and oral DHEA improves libido in adrenal insufficiency.
🧬 Pregnenolone
The upstream precursor to the entire steroid cascade. The 'prohormone pool' argument is appealing and largely untested in humans.
🧬 Tongkat Ali
Lowers SHBG, raising free testosterone — the fraction that is actually bioavailable. Several RCTs show improved libido scores.
🧬 Boron
Lowers SHBG measurably within a week at 3 mg.
🧬 Zinc
Required for testosterone synthesis and for prostatic fluid. Deficiency reliably lowers testosterone.
🧬 Vitex (Chasteberry)
Lowers prolactin via dopaminergic action at the pituitary — the herbal parallel to cabergoline, and useful in women with luteal-phase problems.
🧬 Thyroid Support
Hypothyroidism causes low libido, fatigue and erectile dysfunction, and it is routinely attributed to testosterone instead.
🧬 Shilajit
A 90-day RCT showed raised total and free testosterone alongside improved sperm parameters.
🧬 Fenugreek
Trials show improved sexual function scores; the SHBG and 5-AR mechanisms proposed are both contested.
🧬 Cistanche
Traditional use for sexual function with animal data on erectile response.
🧬 Royal Jelly
Contains testosterone-like sterols and 10-HDA; small trials in fertility and libido.
The other 3 routes to libido & sexual function
Pick the pathway that matches where you are actually stuck. An appetite drug does nothing for someone who already undereats.
Want the protocols behind these?
Dosing schedules, stacking, cycle timing and Coach Cam's notes live inside the Academy — plus the full interactive Vault.
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Frequently asked questions
Testosterone sets the floor under desire in both sexes. Estrogen matters for arousal and comfort in women and for libido in men, which surprises people. Prolactin and thyroid are the two most commonly missed causes, and both are a single blood test away.
17 options are mapped to this pathway in the Vault, including Enclomiphene, HCG, Kisspeptin, Gonadorelin. They are grouped by the mechanism they act through rather than ranked by how much trial evidence exists — 12 carry clinical validation and 5 are mechanistic predictions.
Both ends of the estradiol range kill libido in men, which is why crushing it with an aromatase inhibitor so often makes things worse. Use the sensitive assay — the standard one is unreliable at male concentrations. The markers worth checking are Total Testosterone, Free Testosterone, SHBG (Sex Hormone-Binding Globulin), Estradiol, Sensitive (LC/MS-MS).
Unproven is not the same as ineffective. Of the 17 options on this pathway, 12 have clinical validation and 5 are graded theoretical — meaning the mechanism is sound but the specific human trial has not been run, which is true of a great deal of what works in this space. Nothing on this page is ordered by evidence tier, because sorting by trial count would bury the compounds you came looking for.