I'd been calling it perimenopause. My functional MD had been calling it perimenopause. My friends in Buckhead had been calling it perimenopause. But the honest answer was that I'd been calling everything perimenopause for two years, and nothing I was doing about it was working.
It was 3:14 on a Tuesday afternoon when I caught myself staring at my reflection in the microwave door. Eight hours of sleep the night before. A full Oura readiness score that morning. Two coffees, one matcha, and the magnesium glycinate I take religiously at lunchtime. And there I was, lit by the soft yellow of an unfinished cup of tea, looking like a woman who hadn't slept since 2019.
You probably know the routine. The supplement stack. The Pilates schedule. The sleep tracker. The IV drip your aesthetician suggests. The wellness retreat last September that felt like a miracle for nine days and then dissolved. None of those things were wrong. They just all share an assumption that my cells weren't living up to.
Here is the thing nobody had explained to me until I asked the right person. Under normal atmospheric pressure, your blood and tissue fluids can only carry so much dissolved oxygen, no matter how perfect your inputs are. Every supplement, every protocol, every recovery modality runs on cellular oxygen at the end of the chain. When that ceiling is fixed, the whole stack plateaus underneath it. Why does a perfectly engineered protocol stop translating into how you actually feel? Because every input in that stack still needs one thing to do its job. And that thing is sitting at a ceiling none of the inputs can move.
It's the difference between a high-performance engine running on sea-level air, and the same engine running with a turbocharger. Same engine. Different intake.
A friend mentioned it at coffee. She'd just finished her third session of the week at a small studio in Alpharetta called Below Zero. She told me the way you tell someone about a book that surprised you. Not selling. Reporting.
"It's a private oxygen chamber," she said. "Sixty minutes. You lie down. The pressure inside goes up. You breathe oxygen-rich air. That's it."
I told her it sounded extreme. She laughed. She said the actress Mayim Bialik — who has a PhD in neuroscience and isn't exactly the type to endorse Hollywood trends — had recently installed one at her house. Mayim's words, on Instagram, in August of 2024:
"I know it might seem crazy and like some Hollywood trend, but I'm choosing to cultivate an open mind about the numerous health benefits this chamber can provide." — Mayim Bialik, Instagram, August 2024
She'd added that several of her own doctors had recommended it. "Recommended by many people I trust — including several of my doctors." That isn't a celebrity endorsement. That's what your physician tells you the day she finally trusts you with the thing she's been quietly recommending to her other patients.
I made the appointment.
The suite at Below Zero Alpharetta was the first surprise. It wasn't a clinic. It wasn't a gym. It was a private room, warm-lit, with the chamber itself taking up most of the floor space — a soft-shell pressurized unit that looked, honestly, more like a piece of luxury furniture than a piece of medical equipment.
The practitioner walked me through what would happen. The chamber would inflate. The pressure inside would rise gently to 1.3 atmospheres, about the same difference you'd feel descending in a plane. I'd hear my ears pop. After that, I'd be breathing oxygen-rich air for sixty minutes. I could read. I could nap. I could put on a podcast. I could do nothing.
I climbed in. The pressure rose. My ears popped. And then it was warm and quiet, and I was alone, breathing.
I will tell you that the thing I noticed first was not what I expected. Mid-session, around minute fifteen, I caught myself doing something I hadn't done on purpose in years: I was paying attention to my own breath. Iman Balagam, writing for Marie Claire about her first chamber session, put it better than I can:
"I focused on taking deep breaths, which made me realize how little attention I usually pay to breathing." — Iman Balagam, Marie Claire
That was the second thing I felt. A kind of embarrassed laughter at myself, that this was the first hour I'd spent breathing on purpose, and I had to pay $99 and lie inside a sealed chamber for it to happen.
The third thing took longer. A Bustle reviewer described it as well as anyone has:
"I was so happy, relaxed, and even felt euphoric, experiencing a sense of calm I hadn't in what felt like years." — Bustle, first-person review
I am not a person who uses the word euphoric. I would have rolled my eyes at it last Tuesday. But what she wrote was, more or less, what happened. A kind of settling. A nervous-system load I hadn't realized I was carrying simply turning down.
I read for the rest of the hour. The pressure released gradually. I climbed out, walked back through the lobby, and rebooked my second session from the driver's seat of my car before I'd even pulled out of the lot.
For what it's worth, here is what most women I've spoken to report. By the end of the first session: a calm they hadn't felt in years. By the third session: sleep that holds — they wake up rested instead of just rested-enough. By the sixth session: skin starts to shift, the kind of shift you notice in the morning before you reach for makeup. The pace is slower than retinol and faster than collagen supplements. It's the rate cellular renewal actually runs at.
For the curious: peer-reviewed work on hyperbaric oxygen — Hachmo et al., 2020, in the journal Aging — has found measurable changes in cellular markers associated with biological aging. The wellness-tier session at 1.3 to 1.4 atmospheres is not the medical-tier protocol that study used, and Below Zero is straightforward about that distinction. But it sits in the same general category.
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The people who've made this part of their permanent routines are not the ones in the celebrity magazines. They're the ones in the longevity blogs. Bryan Johnson, whose life's work is essentially measuring what does and doesn't move the needle on biology, wrote on his Blueprint blog after his own sixty-session protocol:
"Subjectively, I've never seen a more dramatic improvement in my skin quality than from these 60 HBOT sessions." — Bryan Johnson, Blueprint blog
The man's job is essentially to know what works and what doesn't. He runs the hard-shell, medical-tier version of the protocol. Below Zero offers the wellness-tier version in a private soft-shell suite. Same general category. Different specifications. Wildly different price point.
LeBron James, in the Netflix docuseries Starting 5, gave the line that stuck with me. He was being asked about his recovery routine, the cryotherapy, the chamber, the routine that's reportedly cost him over $1.5 million a year. The interviewer pressed on the cost. LeBron's answer:
"I think it's just the time." — LeBron James, Starting 5
That's the part I keep coming back to. The people winning the longevity race in their forties and fifties aren't winning it on the supplements. They're winning it on the hours. A protected hour, a few times a week, where the body actually gets to recover. That's the real product. You're not buying a treatment. You're buying an hour.
The celebrity facialist Joanna Vargas — the one J.Lo, Julianne Moore, and Naomi Watts see — described her first session this way: "An immediate glow in my skin, while feeling de-stressed and energized all at once." Glow, stress, energy. Three things she usually treats with three separate appointments. One sixty-minute session. That's the math.
Here is what I will say from one session, knowing I'll have a better answer after ten: I have not felt that calm in years. My skin looked, the next morning, like it had been quietly hydrated overnight. I slept the way you sleep on the second night of a vacation. And I am, as I write this, looking at my calendar to find a third appointment this week.
The same Bustle reviewer ended her piece with the line that has, I suspect, sold more first sessions than any other quote in this category:
"The only part of the oxygen therapy treatment I didn't love was when it ended." — Bustle, first-person review
That was my experience too.
The women who book this aren't the ones still looking for the answer. They're the ones who already know the answer is recovery, and finally chose to give themselves the hour.