Cortisol, the one everyone blames

It's why the 3 a.m. wake feels nothing like ordinary insomnia: you're not sleepy, you're alert and annoyed about it. It's also why the things that work are structural and a bit boring. Treating night sweats (often the single biggest lever, often with MHT), keeping your wake time fixed, getting light early, moving the last drink well away from bedtime, and having a low-stimulation plan for the wake instead of problem-solving in the dark.

Where the research pushes back is on one specific story, the idea that chronic stress wears the adrenal glands out until they can't make enough cortisol. A 2016 systematic review of 58 studies looked for that pattern and couldn't find it, and the Endocrine Society doesn't recognize 'adrenal fatigue' as a condition. That's a comment on the mechanism, not on you. The reason it matters is practical: if that label sticks, the search often stops there, and the things that are treatable (iron deficiency, thyroid disease, sleep apnea, depression, the hormone transition itself) never get looked at.

Saliva testing itself is fine. It's a low-burden, repeatable way to see your daily curve and it's used in real endocrine screening. The thing to watch is what gets built on top of a four-point curve: a 'stage 3 adrenal exhaustion' verdict, and a glandular or proprietary blend to go with it. Mapping your pattern with someone who can also rule things out is a completely different exercise.

So the goal here isn't to prove your glands are fine. It's to get you a workup that actually explains the fatigue, because fatigue is one of the most reliably reported symptoms of this transition and it usually does have an answer.

Some of that literature holds up well. A landmark 2005 review described hypocortisolism as a recognisable state in chronic-stress conditions like fibromyalgia, PTSD and chronic fatigue syndrome, quite possibly arriving after a long stretch of HPA overactivity. A 2015 study found a lower cortisol awakening response in both clinical and non-clinical burnout. And a 2026 meta-analysis of 46 case-control studies in ME/CFS found lower awakening, morning, urinary and hair cortisol, a blunted response to ACTH stimulation and exaggerated suppression on dexamethasone. That last one is the closest anyone has come to a measurable neuroendocrine signature for a fatigue state.

The honest disagreement comes down to three things. One, which way the arrow points: lower cortisol travels with chronic fatigue, but a 2013 systematic review found the effects small, inconsistent, and entirely compatible with disturbed sleep, inactivity and low mood producing the cortisol change rather than the reverse. Two, the group versus you: these are averages with wide overlap between patients and controls, so none of them gives a cut-off that diagnoses one person. Three, the test: even where a real HPA difference shows up, the studies that found it used ACTH stimulation and dexamethasone suppression. A repeated saliva curve can show you whether your pattern looks flat, shifted or irregular, which is useful, and it works best alongside those clinical tests rather than instead of them.

The practical version: an ND who says 'your stress axis may be dysregulated, let's work on sleep, load, movement and nutrition, and rule out thyroid and ferritin first' is on solid ground and describing something the research recognises. In regulated provinces NDs can order the labs that would actually answer the question, so asking for them is easy and uncontroversial. What doesn't hold up is reading a saliva curve as 'stage 3 adrenal exhaustion' and selling a glandular for it. If you're already tracking with a home kit, bring the curve. It's a good pattern diary as long as nobody treats it as the diagnosis.

Which is quite good news, because those are levers you can pull. Resistance training two to three times a week, protein at roughly 1.2 to 1.6 g per kg of body weight, and treating the sleep disruption do more for midlife body composition than any product with 'cortisol' on the label. If the change came on fast, with bruising, thin skin or muscle weakness, that's the version worth investigating properly.

The content matters as much as the light. Late work email, doomscrolling and the group chat are stressors arriving at the exact hour your nervous system is meant to be winding down, and heavy phone use tracks with sleep disturbance and reported stress in cohort data. Blue-light-blocking glasses have thin, inconsistent trial evidence. Putting the phone in another room reliably beats buying an accessory for using it in bed.

What to actually do: a hard stop on work messages an hour before bed, the phone charging outside the bedroom (which also handles the 3 a.m. scroll, the thing that turns a twenty-minute wake into two hours), dim warm light in the evening, and bright light in your eyes within an hour of waking. Morning light is the half of the equation nobody sells you anything for, and it anchors the whole curve.

Mindfulness-based stress reduction shows small-to-moderate effects on cortisol measures across trials, and bigger effects on how the stress feels, which is arguably the outcome you care about. Ashwagandha has some short-term randomised data for perceived stress and a modest cortisol drop, though the trials are small and often sponsor-funded, and it interacts with thyroid medication and immunosuppressants. Worth a pharmacist conversation rather than a casual add-to-cart.

And the one nobody markets: reducing the actual load. Cortisol is a downstream reading of your life. Sometimes the intervention is a boundary, not a botanical.