The Wellness Brew - Issue 08

Cleaning the home is one of those habits that feels unambiguously good for you. The surfaces are cleaner, the space feels fresher, and the products doing the work carry labels full of words like "antibacterial," "fresh," and "naturally derived." What those labels rarely communicate is what is actually in the formula — or what happens to the air in the room after the spray settles. This week, we dig into the chemical exposure that cleaning products introduce daily, what the evidence says about the long-term consequences, and the swaps that meaningfully reduce it. But first, we filtered the noise — here's what's worth knowing this week.

A Popular Sweetener in Thousands of "Healthy" Products May Increase Heart Attack Risk

Erythritol — the sugar alcohol found in thousands of products marketed as low-calorie, keto-friendly, or zero-sugar — has been linked to elevated cardiovascular risk in a study published in Nature Medicine by Cleveland Clinic researchers. An important upfront caveat: this is an observational study measuring blood levels of erythritol, not dietary consumption — and erythritol is also produced naturally by the body through glucose metabolism, meaning elevated blood levels may partly reflect underlying metabolic dysfunction rather than sweetener intake. With that context, the finding is worth knowing: more than 4,000 people across the U.S. and Europe were followed over three years, and those with the highest blood erythritol levels had approximately twice the risk of a major adverse cardiovascular event — heart attack, stroke, or death — compared to those with the lowest. The mechanism is specific: erythritol appears to make platelets more prone to clotting. This study does not prove that consuming erythritol causes heart attacks. It does raise a meaningful enough question about a sweetener widely marketed as safe that further scrutiny is warranted. Witkowski M, et al. Nature Medicine, 2023

A Viral Post Claims Vitamin D3 Prevents Cardiac Injury in Marathoners. Here's What the Study Actually Shows.

A post circulating on social media claims that 100% of unsupplemented marathon runners cross a "cardiac injury threshold" — and that Vitamin D3 supplementation can prevent it. Two things are worth clarifying. First, the "cardiac injury" framing misrepresents what actually happens. Marathon runners do show elevated troponin I after a race — troponin being a protein released by heart muscle cells under stress, which doctors measure to detect heart attacks — but in endurance athletes, these elevations are a well-documented and expected physiological response to prolonged exertion, not a sign of lasting cardiac damage. The troponin normalizes within hours. Second, the underlying study enrolled 21 runners and lost three before completion — leaving 18 people across two groups. At that sample size, no broad conclusions are supportable. Vitamin D3 may well have benefits for endurance athletes, and the hypothesis is worth investigating in properly powered trials. This study is not the evidence the post presents it as. Cheng et al., Journal of the International Society of Sports Nutrition, 2026

The Air Inside Your Home Is Likely More Polluted Than the Air Outside

The EPA estimates Americans spend approximately 90% of their time indoors — where studies consistently find air pollutant concentrations 2 to 5 times higher than outdoor air. The sources are familiar: cleaning products, synthetic fragrance, personal care products, and off-gassing from furniture, carpets, and building materials. VOCs — volatile organic compounds — are the primary category of concern, with formaldehyde, benzene, and toluene among the most commonly detected in residential air. Several are classified as known or probable human carcinogens. Three practical steps worth taking: open windows regularly to exchange indoor and outdoor air; ventilate during and for 15–30 minutes after cleaning; and consider a HEPA air purifier with an activated carbon filter for the bedroom — HEPA alone removes particulates but not VOCs, while activated carbon captures the gaseous compounds. EPA Indoor Air Quality | NIEHS Indoor Air Research

What's Actually in Your Cleaning Products

Cleaning products occupy a different category of chemical exposure than food or personal care — they are aerosolized into indoor air during use and left as residue on the surfaces we touch every day. The chemicals responsible for making products smell clean and work powerfully are often the same ones doing the most damage — and a small number of swaps, made once, reduce daily chemical exposure across every room in the home.

Why cleaning products are a meaningful exposure category

Unlike food labels — which are regulated and must disclose all ingredients — cleaning product manufacturers in the United States are not required to disclose their full ingredient lists. EWG's Guide to Healthy Cleaning found that only 7% of cleaning products adequately disclosed their contents. The rest rely on vague terms like "surfactant," "preservative," or "fragrance" that can each represent dozens or hundreds of individual compounds. [1]

The chemicals that do make it into the air during cleaning are significant in quantity and quality. A 2023 EWG study published in Chemosphere analyzed 30 cleaning products and found they collectively emit hundreds of volatile organic compounds, or VOCs — 193 of which are classified as hazardous, with potential to cause respiratory damage, increased cancer risk, and developmental harm. VOCs contaminate indoor air at levels 2 to 5 times higher than outdoor air, with some estimates reaching 10 times higher. Some products continue emitting VOCs for days or weeks after use. [2]

The lung study — what two decades of data show

The most striking finding in this space comes from a 2018 study published in the American Journal of Respiratory and Critical Care Medicine, led by researchers at the University of Bergen in Norway. The study followed 6,235 participants for more than 20 years as part of the European Community Respiratory Health Survey — one of the longest and largest analyses of cleaning product exposure and respiratory health ever conducted.

The finding: women who cleaned at home at least once per week experienced a decline in lung function over 20 years equivalent to smoking 10 to 20 cigarettes per day over the same period. Women who cleaned professionally showed even greater decline — a reduction of 15.9 ml per year in forced vital capacity, compared to 8.8 ml annually in women who did not clean regularly. [3]

Cleaning chemicals irritate the mucous membranes lining the airways. When this irritation is repeated daily over years, it produces persistent low-grade inflammation that eventually causes structural changes in airway tissue — a process the authors described as airway remodeling. This is an observational study, and it does not prove that cleaning products directly caused the lung decline. But the effect size is large, the follow-up period is exceptional, and the dose-response relationship is clear — the more cleaning, the greater the decline. The finding is worth taking seriously.

All-purpose and surface sprays — quaternary ammonium compounds

The active disinfecting ingredient in the majority of conventional multi-surface sprays is a class of compounds called quaternary ammonium compounds, or quats. On labels they appear as benzalkonium chloride, didecyl dimethyl ammonium chloride, or any ingredient ending in "-onium chloride."

Quats are well-documented as respiratory sensitizers, meaning they can cause hypersensitivity in the airway following inhalation. A multicenter cohort study published in the Journal of Allergy and Clinical Immunology identified QAC-induced occupational asthma across a cohort of 871 subjects — confirmed through bronchoprovocation testing, the gold standard for diagnosing chemical-induced asthma. [4] EWG's Guide to Healthy Cleaning separately lists quats among the ingredients linked to asthma as well as reproductive harm and birth defects in animal studies.

An important calibration: the strongest evidence for respiratory harm comes from occupational settings — healthcare workers and professional cleaners using these products at high frequency throughout the workday. Home use represents meaningfully lower exposure intensity, but daily chronic exposure to documented respiratory sensitizers — even at lower concentrations — is not without consequence. Fragrance-free, non-toxic alternatives exist at equivalent price points and simply eliminate the question.

One alternative worth knowing: white vinegar diluted with water — typically a 1:1 ratio — is an effective, zero-chemical option for most general surface cleaning, including glass, countertops, and bathroom surfaces. It is antimicrobial, leaves no chemical residue, and costs a fraction of conventional sprays. 

What this means in practice

Cleaning sprays are among the most acute sources of indoor chemical exposure in the home — aerosolized directly into breathing air during use, emitting VOCs for hours or days afterward, and applied to the surfaces touched throughout the day. The good news is that this is one of the most straightforward categories to address. White vinegar and water costs almost nothing and handles the majority of everyday surface cleaning without introducing a single synthetic chemical. For situations requiring a more complete solution, non-toxic alternatives from established brands are widely available at equivalent price points. The Actionable Takeaways below outline exactly where to start.

Three things you can do this week:

1. Replace your all-purpose spray this week. Of all the cleaning product categories, spray cleaners represent the most direct and immediate chemical inhalation risk — aerosolized directly into the air you breathe during use, with VOC emissions that can persist for hours afterward. The swap requires one decision and one purchase. White vinegar diluted with water at a 1:1 ratio handles the vast majority of everyday surface cleaning without introducing any synthetic chemicals. It is antimicrobial, leaves no residue, and costs almost nothing. For situations requiring stronger cleaning or genuine disinfection, Branch Basics, Force of Nature, and Seventh Generation Free & Clear are all well-regarded non-toxic alternatives. Choose fragrance-free across all options.

2. Ventilate your home while cleaning — and after. Switching products is the priority, but ventilation is a meaningful complement regardless of what you use. Open windows before you start cleaning and keep them open for at least 15 to 30 minutes afterward to allow VOCs to clear. If weather or location makes this impractical, turn on an exhaust fan or direct a fan toward an open window to accelerate air exchange. This single habit meaningfully reduces peak VOC exposure during the highest-concentration window — when a product has just been sprayed and is still actively off-gassing.

3. Add a HEPA air purifier with an activated carbon filter to your home. Indoor air pollutant concentrations are consistently higher than outdoor air — and cleaning products are one of the primary contributors. A HEPA air purifier removes particulates — dust, allergens, mold spores — but does not capture VOCs, which are gaseous rather than particle-based. An activated carbon filter captures VOCs and is the critical addition for a home where cleaning products, synthetic fragrance, or off-gassing materials are a concern. Well-regarded options at accessible price points include Winix, Levoit, Coway, and Blueair — look specifically for models that include both HEPA and activated carbon filtration.

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Wellness, filtered.

The Wellness Brew

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Disclaimer: The Wellness Brew is for informational purposes only and does not constitute medical advice. The content published here is not intended to diagnose, treat, cure, or prevent any disease or health condition. Always consult a qualified healthcare professional before making any changes to your diet, supplement routine, or lifestyle.