Ariana Thacker had every reason to feel healthy. A chemical engineer turned venture capitalist, she was actively working out, eating well, and had no prior health issues.
Then, over a six-and-a-half month period in 2022, everything changed.
Debilitating fatigue, brain fog, significant hair loss, weight gain, and mood changes. She cycled through specialists - neurologists, immunologists, allergists, functional health practitioners. Blood work came back normal. An MRI showed nothing. It was, in her words, "a big enigma."
The answer wasn't inside her body. It was in her Miami apartment: Mold. High levels of it, discovered through an air quality assessment. Today, Thacker still takes daily medication for what appears to be a chronic condition developed from just six months of exposure.
Her story became the catalyst for MoldCo, which raised $8 million in seed funding in September 2025 to offer virtual mold toxicity testing and treatment.
But it's also a window into something larger: The overlooked environmental determinants of women's health, playing out in both the macro climate around us and the micro environments we inhabit daily.
The Outdoor Environment: Climate Change's Gendered Health Toll
The climate conversation around women's health has often centered narrowly on reproduction. But the health impacts are far more expansive.
3.6 billion people live in regions vulnerable to climate change, with projections of an additional 250,000 deaths annually between 2030-2050 from climate-related causes. Women aren't just affected - they're disproportionately affected across multiple dimensions.
Start with the physical health impacts. Two out of three women die from non-communicable diseases - cancer, diabetes, cardiovascular diseases, and respiratory conditions - many of which are exacerbated by environmental factors. While women generally live five years longer than men, they spend more of those years in poor health, dealing with conditions that environmental exposures can worsen.
Climate disasters increase depression and anxiety risks, particularly for women who bear the brunt of caregiving responsibilities during crises.
Then there's displacement. An estimated 80% of people displaced by climate change are women, with displacement increasing risks of physical and sexual violence.
Extreme weather events damage health facilities, disrupt supply chains, and limit access to essential healthcare services. When water and sanitation systems become compromised, women face greater health and safety risks while taking on increased domestic and care work as resources disappear.
Reproductive health is another piece of this puzzle. Extreme heat during pregnancy is linked to preterm birth, low birth weight, and stillbirth. Climate change disrupts menstrual health through impacts on water access and sanitation facilities - issues that affect daily life and dignity, not just fertility.
The Indoor Environment: Home as Health Hazard
While climate change grabs headlines, an equally insidious threat lurks much closer. Many of us spend 90% of our time indoors - in homes, workplaces, and other enclosed spaces - where the air quality is often worse than outside.
Some sources state that indoor air is 2-5 times more polluted than outdoor air, yet it receives a fraction of the attention.
Take mold. More than 50% of US households show signs of mold, water damage, or dampness, with an estimated 25 million people impacted by mold-related illness. Most physicians don't screen for it. There isn't even an ICD-10 code for mold-related illness.
This is the gap Ariana Thacker fell into - and the one MoldCo is now trying to fill. Her experience of cycling through specialists, accumulating medical bills, and getting nowhere is replicated millions of times over. The company's virtual clinic offers lab testing starting at $99 for a starter panel up to $799 for comprehensive biomarker testing, with treatment protocols running $150-300 monthly. They're currently operating in 46 states with plans for nationwide US expansion by 2026.
Then there's the microplastics crisis. What started as a marine biology concern has become a human health emergency. Microplastics have been found in 93% of bottled water and 90% of protein sources. More concerning: Studies confirm their presence in 14 out of 18 women's follicular fluid and all tested human semen samples.
They're in placentas, blood, ovaries - crossing barriers we once thought impermeable.
Microplastics and endocrine-disrupting chemicals interfere with the hypothalamic-pituitary-gonadal axis, mimicking or blocking natural hormones. These particles accumulate in placental tissue and affect ovarian function, with animal studies showing decreased ovarian weight, fewer mature follicles, and oxidative stress.
The fertility numbers are stark. Global sperm counts have dropped 50% since the 1970s, coinciding with rising plastic production. Long-term air pollution exposure is linked to female infertility, with pollutants like PM2.5, SO2, and NO2 all showing significant associations. Pregnant women exposed to high air pollution face risks of hypertensive disorders, postpartum depression, placental abruption, low birth weight, and preterm birth.
Healthcare costs related to endocrine-disrupting chemicals hit an estimated $340 billion annually in the US alone.
The exposure gap extends beyond biology. Women are disproportionately hit by indoor air pollution because they tend to be primarily responsible for cooking. Women exposed to household air pollution face 46% higher risk of developing cataracts.
They're often primary caregivers and managers of household resources - water, energy, food preparation. More time indoors, more time in kitchens, more time managing the very environments that may be making them sick.
The pathway from home environment to health impact is becoming clearer. Cooking creates temporary spikes in harmful pollutants. Plastic food containers leach chemicals. Laundry releases microfibers into water systems. The cumulative effect of these daily exposures - none dramatic on their own - adds up over years and decades.
The Startup Response: Building the Infrastructure for Environmental Health
Traditional healthcare has been slow to respond. Startups are moving faster, building solutions across testing, monitoring, and mitigation.
Testing and Diagnosis
Beyond MoldCo, the microplastics testing market is expanding rapidly.
Blueprint, Bryan Johnson's longevity company, launched the first at-home microplastics blood test with a 4-6 week turnaround. Numenor offers similar testing in the UK with personalized recommendations for reducing exposure. These aren't vanity metrics - they're baseline measurements that let people track whether interventions are working.
Consumer Reports ran a Microplastics Detection Challenge in 2025 for at-home food testing, receiving 72 submissions for low-cost detection methods under $15 per test. Winners included fluorescence-based kits that highlight plastic particles using smartphone cameras.
Soar Optics is developing rapid on-site detection technology for water and environmental testing that could enable faster, field-based decision-making.
Monitoring
Ultrahuman Home ($549) takes a different approach: Comprehensive environmental monitoring that tracks air quality, light exposure, humidity, noise, UV levels, CO, CO2, and particulate matter. The device correlates environmental factors with physiological metrics when paired with their wearable ring, creating a feedback loop between environment and health outcomes.
Mitigation
Prevention startups are tackling specific pollution pathways. BALEENA offers home laundry filter technology to capture microfibers before they leave washing machines - a major source of microplastic water pollution. Neoplants uses genetically modified houseplants to absorb VOCs and pollutants that traditional air purifiers can't efficiently capture.
The Investment Thesis: Why Environmental Health Is Women's Health
For investors, founders, and corporates in the women's health space, environmental health represents a logical extension of existing work.
Adjacent expansion for existing players. If you're building in fertility, maternal health, or menopause, environmental health might be a logical next frontier. Your customers are already asking about it. The IVF patient wants to know if microplastics are affecting her egg quality. The pregnant person wants to understand if her home air quality is safe. The woman experiencing early menopause is wondering if environmental factors accelerated it.
Fertility crisis meets environmental awareness. Fertility rates are declining globally and people are searching for explanations. Environmental factors - from air pollution to endocrine disruptors - are increasingly part of that conversation. The intersection creates demand for solutions.
Regulatory momentum is building. The EU is banning endocrine-disrupting chemicals. Microplastics regulations are emerging globally. This isn't theoretical future risk - it's happening now, creating both compliance needs and consumer expectations for safer products.
The prevention shift. Healthcare is finally, slowly, moving upstream from treatment to prevention. Environmental health sits at the furthest upstream point - addressing exposures before they become disease. The unit economics are compelling when you can prevent chronic conditions rather than manage them for decades.
Early market validation. MoldCo raised $8 million in seed funding just two years after launch. At-home microplastics testing is moving from concept to commercial product. Consumer Reports is crowdsourcing detection methods. Early movers are finding product-market fit.
Looking Forward
The next wave of women's health innovation won't just address what's happening inside our bodies - it will address the environments shaping our health.
From the air we breathe to the water we drink to the homes we live in, the spaces women inhabit are finally getting the attention they deserve.
This isn't about adding environmental health as a nice-to-have feature. It's about recognizing that indoor and outdoor environments are fundamental determinants of health outcomes - and that women, due to both biology and social roles, experience these exposures differently and more intensely.
The opportunity is significant. The need is urgent. And if Ariana Thacker's story tells us anything, it's that the market is ready for companies brave enough to tackle problems the traditional healthcare system has been content to ignore.
