Cortisol, testosterone and thyroid function, and what human studies show moves them.
Short sleep is one of the few hormone disruptors tested in tightly controlled human experiments. What a run of five-hour nights did to testosterone, insulin and appetite, and what reversed it.
Appetite rising after a diet is a measured hormonal state, not a lapse. What a year of follow-up showed, why the body defends its old weight, and which counter-measures have trial support.
Cortisol and inflammation can dampen TRH signalling and T4-to-T3 conversion while TSH stays in range. What a normal TSH does and does not rule out, and which tests to discuss with a clinician.
The morning cortisol spike is a normal part of the daily rhythm. The problem is a shifted or flattened curve, and the article walks through four everyday habits that disturb it and what to change.
DHEA-S falls steadily after the mid-20s. RCTs support replacement in adrenal insufficiency and show small effects on bone, libido and mood elsewhere; who should avoid it and what trials used.
Myo-inositol has trial evidence for ovulation and insulin sensitivity in PCOS, for gestational diabetes risk and, in small studies, for panic symptoms. The 40:1 ratio, study doses and safety.
Fadogia agrestis went viral after a Huberman Lab mention. The evidence is entirely from rodents, it includes testicular and liver toxicity at high doses, and no human trials exist.
One 90-day randomized trial in men aged 45–55 reported about 20% higher testosterone with purified shilajit. What else has support, the doses used, and why unpurified resin carries a heavy-metal risk.
Apigenin is chamomile's main flavonoid. It inhibits the NAD+-consuming enzyme CD38 in mice and acts on GABA-A receptors in cell studies; human evidence comes from chamomile trials, and the testosterone claim has none.
What trials show for tongkat ali, ashwagandha, zinc and boron individually on testosterone and SHBG, the doses studies used, safety limits, and why the four have never been tested together.
Tongkat ali raised testosterone mainly in stressed or low-testosterone men in trials. The mechanism, the 200–400 mg doses studies used, extract quality and the mercury risk in cheap products.
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