Inside job

The Brief

Welcome back, Wellworthy readers.

When you can’t focus or just feel off, most people blame stress, poor sleep, or too much screen time.

But Harvard researchers have been building a case for a different culprit.

This week, we're looking at what air inside your home might be doing to your brain.

Here’s what’s inside:

• Why indoor air quality could be a hidden cause of brain fog

• Oura's new AI built specifically for women's health

• NEW DROPS: A nasal care brand timed for allergy season, drinkable chocolate fiber, and Zara’s new gym equipment

Here we go!

— Jake, Joana & Ash

The Breakdown

A decade of Harvard research found cognitive function scores doubled when people worked in better-ventilated spaces. 

A follow-up study of 302 office workers in six countries backed it up—higher CO2 and more indoor particles were linked to slower thinking and poor decision-making. As air quality dropped, so did mental sharpness.

Why it matters

The culprit isn’t always smoke or smog. It's often CO2, the air we exhale, quietly building up in any room without enough fresh air. 

A simple fix, research shows small ventilation upgrades improve cognitive performance, meaning you can boost mental clarity without turning your home into a lab.

What you can do

• Create quick airflow. Open a window for 5–10 minutes, especially in bedrooms and home offices.

• Cut common offenders. Candles, incense, and synthetic fragrances can worsen indoor air.

• Upgrade filtration. If you use HVAC, a higher-quality filter can help. If not, a small air purifier in your most-used room is a high-leverage move.

The takeaway

We spend roughly 90% of our time indoors. Most wellness advice focuses on what you eat, how you train, and how you sleep, but the air you breathe is an important factor.

And unlike outdoor pollution, indoor air quality is something you can actually control.

🚽 The most intimate health tracker yet?

We've never wanted more data about our bodies, and health tech is moving into some surprising places. A new wave of toilet attachments can now analyze everything from gut health markers to vitamin C levels and sync it straight to your phone.

We broke down the companies leading the way and what they're actually tracking.

Just Dropped

New products and drops spotted → 

Wellness tech & longevity

Wizard Wellness is a new nasal care brand launching ahead of allergy season, and their whole pitch is that your sinuses should be treated like skin. The three-step system is built around the nasal microbiome, your first line of defense against pollen, dust, and irritants when it's actually in balance. Shop now.

Sanctum just launched Sanctum Digital, bringing its mind-body and somatic movement platform to wherever you are. Pick from video-led, music-led, or immersive walks that use sensation and rhythm, built around the idea that your own body is a tool to change how you feel. Find it in the app store. 

Hodos Labs is a new performance skincare brand built specifically for athletes, with products designed to get you back to training faster. Their lineup includes an anti-chafe and dermal repair stick, a magnesium reset spray, and a hydration recovery cream. The part of your recovery routine you've probably been overlooking. Shop the line.

Supplements & nutrition

GoodVice is a prebiotic fiber drink created by food tech company one.bio, built on the idea that many people are getting only a fraction of the fiber their bodies actually need. Each serving packs 10g of prebiotic fiber and 15g of grass-fed protein in flavors like best-ever chocolate, Madagascar vanilla, and sweet cream coffee. Try it here.

UPDATE relaunched its energy drink with Kim Kardashian as co-founder and a formula worth paying attention to. It swaps caffeine for paraxanthine, the compound your body converts caffeine into anyway, so you get the focus without the jitters or crash. Try it here.

Bonafide's new Noctera is a sleep supplement built for menopause. Most sleep aids help you fall asleep, but this one uses a formula that releases slowly throughout the night so you stay asleep. In clinical trials, women gained an average of 40 extra minutes of sleep per night. Find out more.

Momentous launched Fiber+, a fiber supplement that combines soluble fiber, insoluble fiber, and resistant starch. Most fiber supplements only support one. This triple-action formula makes the case that fiber shouldn't just support digestion, it should support overall well-being. No wonder it's Arnold Schwarzenegger's personal favorite. Get it here.

POCA makes zero-calorie, single-serve flavored syrups for your coffee, matcha, or whatever you're drinking. Each packet is sweetened with monk fruit and chicory root fiber instead of cane sugar or sugar alcohols. The brand launched with three classic flavors this week: vanilla, caramel, and pistachio, and they fit in your pocket. Shop now.

Fitness & training

Zara Home launched its second gym collection, and it's so aesthetic it could double as decor. Think leather-wrapped medicine balls, oak dumbbells, cork yoga rollers, and even athleisure to match. Every piece feels more like a curated object than a piece of workout equipment. We expected nothing less. See the collection.

Peloton Personal Trainer, a new beta program powered by Trainwell, uses Peloton's class to match you with a virtual coach who builds your weekly plan, checks in over video, and messages you daily. The workout library is still impressive, now just with an actual human who tells you what to do with it. Join the beta.

On Our Radar 

What's moving in wellness this week → 

Oura's building an AI that speaks women's health. The company just launched its first AI model built specifically for women, covering everything from early cycles through menopause. Women's health focus continues to scale, and this next step means getting answers that are actually informed by your own biometric history, not just generic health information.

Loop earplugs just landed in SoulCycle studios nationwide. The Belgian earplug brand's Experience 2 model reduces noise by over 17 dB without dulling the music or muffling your instructor. If you’ve been to a spin cycle, or any group fitness workout, really, you know fitness spaces have been a blind spot for hearing protection. This puts the solution exactly where the problem is.

The underwear-able that could change gut health. University of Maryland scientists are developing a wearable sensor—worn in your underwear—that tracks hydrogen emissions (in other words, flatulence) to map your digestive health in real time. The goal is to do for gastroenterology what the Apple Watch did for cardiology, and the 40% of U.S. adults dealing with chronic digestive issues might finally have something worth wearing.