Topic
HPA axis
Everything we've written on HPA axis — 12 articles covering the mechanism, the evidence, comparisons, and practical considerations.
12 articles
Immune modulationThe mid-life divorce body — the physiological reset that doesn't get talked aboutThe divorce took two years from the first serious conversation to the final signature. You lost eleven pounds in the first three months and couldn't tell you why — you were eating, or trying to. Then you gained it back plus seven more, and that didn't make sense either. You stopped sleeping the way you used to. Not insomnia exactly, more like a quality change — you'd wake at four and lie there running the same thoughts through the same loops without getting anywhere, and by six you'd give up and start the day already depleted. At some point you noticed you were getting sick more than usual, or that things you would have shaken in a week were dragging into ten days. You were in what by any external measure should have been a manageable life situation — adults divorce, people survive it, you were going to be fine — and your body was responding as if something genuinely dangerous was happening.9 min readSleep and recoveryDSIP and the deep-sleep story — what the original peptide research suggestedIt's 1974 in Basel, Switzerland, and a rabbit is asleep. Not naturally asleep — electrically induced into a slow-wave state, its brain oscillating in the long, lazy delta rhythms that characterize the deepest phase of sleep. Marcel Monnier and Guido Schoenenberger are collecting something from the animal: blood drawn from the cerebral venous sinus, the vessel draining the sleeping brain. Their hypothesis is strange by the standards of the time. They believe sleep isn't just a brain state — they believe it might be a circulating signal. Something in the blood of a sleeping animal, they suspect, could make a waking animal sleep.8 min readSleep and recoveryDSIP for sleep, jet lag, and HPA balance — the limited human researchYou land at six in the morning local time after a transatlantic flight and your body is certain it's midnight. The hotel room is perfectly dark and perfectly quiet and you cannot sleep. You're not just tired — you're in the peculiar purgatory of jet lag where exhaustion and wakefulness coexist, where the machinery for sleep is clearly present but something has come loose in the timing mechanism. You lie there for three hours watching the ceiling brighten. By the time you give up and shower, you've been awake for twenty-two hours and feel like you've been awake for thirty.8 min readImmune modulationThe entrepreneur's body — when work has become the lifestyle diseaseYou haven't taken a real vacation in three years. Not a real one — not the kind where your nervous system actually downregulates. You've taken trips where your laptop came and you checked Slack from the pool and handled something urgent on the first morning. The distinction matters physiologically. The body doesn't relax because the setting is different. It relaxes when the threat appraisal system is genuinely offline, and yours has been online, at varying intensities, for years. The 11pm deal call. The Sunday morning that turned into a full Sunday. The thing about entrepreneurial and executive life that doesn't get said plainly enough is that it's not just demanding — it reconfigures the baseline of your nervous system, slowly, across years, until the hypervigilance that felt like a temporary state stops feeling like a state at all and starts feeling like you.9 min readRecovery and inflammationOvertraining syndrome — what it is and where peptide support has been exploredYou've been training harder than ever and your times are getting worse. Not plateau-worse. Actually declining. The resting heart rate you've tracked for years — low fifties, reliable as a clock — is sitting in the high sixties and won't come down. Your legs feel like they belong to someone older. The motivation that used to be the easiest thing about your athletic life now requires active negotiation every morning. You sleep seven or eight hours and wake up feeling like you slept four. You took a deload week. Then another. The numbers didn't move. And a voice in the back of your head that you've been ignoring for months is starting to say that something is actually wrong.7 min readImmune modulationPeptides for stress and cortisol regulation — what research has explored across the HPA axisYou don't feel stressed the way you feel hungry. Chronic stress doesn't announce itself with a single sensation and then resolve when you eat. It settles in over months or years — a low-level hum underneath everything, a shorter fuse, a body that never quite unwinds after the hard days. You sleep, technically. You function, technically. But the recovery is shallow, the mornings don't feel fresh the way they used to, and somewhere along the way your baseline shifted without you noticing when.10 min readImmune modulationPeptides for stress resilience — the HPA axis and beyondYou don't feel stressed the way you feel hungry. Hunger is specific — it arrives at a known location and you understand what it wants. Stress doesn't announce itself the same way. It shows up as a short temper in the school pickup line, as the 3 a.m. ceiling-stare that recedes by morning without resolution, as the tension across your shoulders you only notice when someone asks if you're okay. By the time the pattern becomes visible to you, it's usually been running for a while. The body has been in it longer than your awareness has.10 min readCognitive supportPre-workout anxiety — when training starts feeling like fight-or-flightYou've been training for years. It's one of the things you do for yourself, one of the things that has reliably worked. And somewhere in the last year — not dramatically, not all at once — the warm-up has started feeling different. The first heavy set isn't anticipated the way it used to be. There's something closer to dread in it. Your heart rate is measurably elevated before the bar is even loaded. Your breathing is shorter than the exertion demands. The body is bracing instead of preparing, and you don't know when that switch happened.9 min readHormonal and endocrineSeractide / ACTH 1-39 — adrenal function testing in plain EnglishYou've been fatigued for two years. Not tired — fatigued. The kind where waking up doesn't end it, where the second half of every day feels like dragging yourself through something thick, where you've stopped scheduling things in the afternoon because you know you'll be useless. The labs your primary care doctor ran came back "normal." But normal relative to what, and for whom, and measured at what time of day — those questions don't usually get asked. If they do get asked, eventually someone orders an ACTH stimulation test, and what that test measures is more specific and more useful than most fatigue workups. Understanding what it's doing requires understanding the gland it's interrogating.7 min readImmune modulationThe burnout that isn't depression — and why the distinction mattersYou used to love this. That's the part that's hardest to explain to someone who hasn't been here. Not that you're sad, exactly — though sometimes you are. Not that nothing matters — you can still feel things matter, in the right moment, with the right person, when something breaks through. It's more that everything costs more than it should. The things you were good at and cared about feel like they're behind glass. You do them because you have to, and you do them well enough, but the quality of attention you're bringing is different from what it used to be. You can feel the difference even if nobody else can see it. Your battery is at 20% and has been for a year. You sleep eight hours and wake up at 60%. You sleep ten hours and wake up at 60%. The number doesn't move.8 min readImmune modulationCan't handle stress like you used to — when the buffer is goneA difficult email arrives and your stomach is in knots for an hour. Not a crisis email. Not something that genuinely changed anything. Just a tone, an implication, a small friction with someone at work. An hour later you're still running it. A hard conversation with someone close to you — the kind of conversation that needed to happen, that you've had many times before — and your sleep that night is broken. A busy week that would once have felt demanding but manageable and you're sick by Saturday. Not dramatic sick. The kind that shows up at the first available moment when the pressure lifts and your body catches the illness it's been holding at bay.8 min readMetabolic healthThe coffee dependence that wasn't there beforeYou used to drink one cup. Maybe two on busy mornings, but one was usually enough. Somewhere in the last few years that changed — you couldn't say exactly when — and now the arithmetic is different. Three cups to feel functional. Skip the morning coffee and by ten a.m. there's a headache sitting behind your eyes and an irritability that isn't quite you. The afternoon cup, which you used to skip without thinking about it, has become non-negotiable. You've tried cutting back. The first day is manageable. By the second morning you feel like you're moving through syrup.8 min read