Can Toxins in Products Actually Reach You?

How to know what's in a product without an ingredient list

We'll start with the first question: is a hazard actually in the product? Most home products don't come with ingredient lists. A mattress doesn't disclose the foam blowing agents, the flame retardant chemistry, or what's in the polyester cover fabric. A dining table doesn't tell you which glue binds the wood particles together.

So we work backwards, using third-party certifications. Each certification tests for a defined set of hazards and applies one of three rules: a full ban, a strict limit under a set threshold, or required disclosure of the worst offenders. None of them cover everything, but together they move the first question-marked step of the six-step framework closer to certain.

Certifications are the strongest proxy we have for what's actually inside a product. Third-party means an independent organization tests the product, so the company can't make the claim on its own. None are perfect, but they're the most reliable tool available so far.

Here's a closer look at how a Hazard? becomes Healthy. On the left is the hazard box with a question mark. It contains all the possible hazards from Part 6's list that you might find in fabric.

On the right is the same list after OEKO-TEX certification is applied. OEKO-TEX tests the fabric, and certification means many of those hazards are either excluded entirely or held under a strict threshold:

Using x-ray vision

Certifications mostly apply to individual materials, not whole products. This is why there's technically no "non-toxic" couch. No single certification looks at a finished couch and checks every part of it together. Each material in the product (the foam, the fabric, the wood frame, the glue) gets evaluated on its own, if it gets evaluated at all.

The way to handle this is to mentally take the product apart. Every product is actually a set of materials, and to know what hazards might be present, you first have to see each one. For a couch, that means:

• Wood frame
• Foam cushions
• Fabric cover
• Wood glue

Then for each part, ask:

1. Is there a certification for this material? If yes, use Step 1 above to see which hazards are excluded or limited. You have a good idea of what's not in it. If no, the material stays a question mark, and you'd move to the next question.
2. Turn on your x-ray vision and gather as much information as you can about what the material actually is, and what invisible coatings might be on it. For a couch, a wood frame might be raw, but more likely it's stained and sealed with some kind of finish. A fabric might be untreated cotton, but it might have a PFAS stain repellent or a plant-based DWR water repellent applied.

Most of this decomposition work is already done for you in the Material Health Guides. Each guide takes one material category and walks through the certifications, the common coatings, and what you can reasonably assume when a product doesn't disclose much. But the underlying move is the same: take the product apart, look at each layer, and ask what's known and what isn't.

Whether a layer is certified or uncertified, both paths get you to the same place: a relative rating. Certified layers land higher on the scale because you know more about what's excluded. Uncertified layers land lower because you have to assume more. Neither gives you certainty. What it gives you is a defensible position on the scale, from healthiest to harmful, that you can act on.

That brings us to the second question: can a hazard move out of a product and into my home?

How chemicals get out of products and into your home

Even with certifications, some hazards remain possible. So we need to know whether those hazards actually leave the product and enter the home environment, or whether they stay locked in place.

For this, we'll use a new example: a piece of polyurethane foam with CertiPUR-US certification.

To figure this out, instead of sorting the potential hazards alphabetically, let's sort them by chemical behavior.

There are several ways to organize household chemicals. You can group them by biological effect (endocrine disruptors, carcinogens), by chemical structure (PBDEs, phthalates, bisphenols), or by function (solvents, flame retardants, plasticizers). All are valid, and a single chemical can belong to several categories at once. A PBDE, for example, is a flame retardant by function, an endocrine disruptor by biological effect, and a brominated hydrocarbon by structure.

For this course, organizing by behavior, specifically how a chemical moves out of a product, is the most useful. The four main behavior groups are VOCs, sVOCs, particles, and heavy metals.

What are VOCs?

VOCs are substances that become gas.

Volatile Organic Compounds, or VOCs, are chemicals that release into the air as a gas at normal room temperature. This is called off-gassing. Heat speeds it up, which is why a warm room or a sunny car releases more VOCs than a cool one. But ultimately, VOCs are released spontaneously into the room, regardless of temperature and moisture levels. Once airborne, VOCs move freely through indoor air.

If you've ever noticed the "new car" or "new furniture" smell, you've detected VOCs. Scented candles release VOCs. So do flowers and trees. Not every VOC is synthetic, and not every VOC is harmful. Whether a specific VOC matters depends on which one it is and how much of it you're exposed to.

VOCs come from materials made with synthetic chemicals: foams, adhesives, plastics, fabrics with synthetic treatments, and wood with paints and finishes. Materials without that chemistry don't release them. Ceramic, glass, and bare metal don't off-gas VOCs, for example.

What are sVOCs?

sVOCs are substances that migrate slowly.

Semi-Volatile Organic Compounds, or sVOCs, are between VOCs and the next type of behavior, particles. They don't usually become gas and drift away spontaneously like VOCs do, but they aren't locked permanently into the material either. They leave slowly, over months or years, and end up on nearby surfaces, in household dust, and on other objects in the room.

A useful analogy is butter left on the counter. It doesn't evaporate into the air, but it slowly migrates onto the butter dish, driven by heat and time. sVOCs move the same way.

sVOCs come from heavier synthetic chemicals added to products for performance: flame retardants in foam and electronics, plasticizers like phthalates in vinyl and soft plastics, stain and water repellents on fabrics and carpets. Materials without those additives don't release them. Untreated natural fibers, ceramic, glass, and bare metal aren't sVOC sources.

What are particles?

Particles are physical fragments of things.

Also called particulate matter, or PM1, PM2.5, and PM10, particles are small solid pieces of material. Unlike VOCs and sVOCs, which are individual chemical molecules, particles are physical fragments made up of many chemicals at once. They're defined by their size, not their chemistry, and they're generated by friction, abrasion, deterioration, and combustion.

Size determines how they behave. Larger particles (PM10 and up, like dust you can see) settle out of the air quickly and become part of household dust on floors and surfaces. Fine and ultrafine particles (PM2.5 and PM1) stay airborne for hours and travel freely through the home before settling.

Particles come from materials that shed, break down, or burn: foam and fabric that abrades into household dust, wood and drywall during sanding or renovation, candles and gas stoves during combustion, synthetic textiles that release microfibers. Sealed, stable materials don't generate particles on their own. A glass vase or a ceramic tile sitting on a shelf isn't a particle source unless it breaks or gets ground down.

What are heavy metals?

Heavy metals are substances locked into materials.

Heavy metals like lead, cadmium, and arsenic are usually bound tightly into the material they're part of. Unlike VOCs, sVOCs, and particles, they don't move on their own. They stay put unless something acts on the material to release them: heat, acid, or friction.

That's why a lead-painted windowsill is a low concern when it's intact and a high concern when it's chipping, sanded, or chewed on. It's why acidic foods cooked in old enameled cookware can pull cadmium out of the glaze, while the same cookware holding dry goods doesn't. The metal hasn't changed, but the conditions around it have.

Antimony is a partial exception. It's used as a catalyst in polyester and foam production and shows up in products like polyester fabric, mattresses, and some wallpapers, where it can migrate out more easily than other heavy metals under normal conditions.

Heavy metals show up in older paints, vintage ceramics and glassware, some imported or antique metal cookware, certain pigments and dyes, polyester-based textiles, and a few specific plastics. New materials made to current US standards are mostly free of the worst offenders, with exceptions worth knowing about (which the Material Health Guides cover). Whether a heavy metal in your home matters depends mostly on whether anything is acting on the material to release it.

Each material produces a consistent, predictable set of chemical behaviors. Foam off-gasses VOCs and releases sVOCs over time. Ceramic doesn't do either. Metal sheds heavy metals if disturbed. Glass mostly sits there.

But within each material, the rating tier changes how much of each behavior actually reaches your home. Healthier tiers produce less of everything. Harmful tiers produce more. The cards below combine both: the material's typical behaviors, layered against the five health tiers, so you can see what to expect at each level.

As before, don't worry about memorizing it.

Because the tier of a material changes how much of each chemical type leaves it, we can comfortably use it to fill in the exposure box of the six-step framework, too.

The two boxes are still distinct questions, but the same scale answers both, because most of the certifications behind it are actually testing what potentially reaches you, not just what's inside the product. OEKO-TEX Standard 100 sets limits based on what can be extracted from the fabric under skin-contact and saliva conditions, since the standard is built around how textiles meet the body. GREENGUARD Gold is an emissions standard, measuring what a product releases into the air over time. CertiPUR-US tests both content and emissions for foam. Even Prop 65 is somewhere between a hazard and expected exposure list: a substance triggers a warning when the projected exposure to a typical user crosses a threshold, not when the substance is merely present. So the healthier the tier, the less is reaching you, by design.

It's still relative. Just like the hazard box, the exposure box doesn't resolve to a clean yes or no. It resolves to a tier on the same scale, healthiest to harmful, with the same meaning: the healthier the tier, the less is reaching you. The cards above already show this. Healthier tiers release fewer VOCs, fewer sVOCs, fewer particles, fewer heavy metals. Harmful tiers release more of each.

The two boxes are still separate concepts. Think of an arsenic bottle sitting on a shelf in another country: very high hazard, but if it never reaches you, exposure stays at zero. We're not collapsing the two ideas. In the practical situation of home products, though, given the certifications and strategies we have for answering the question, the same answer fills both.

The three ways home toxins reach your body

This is the last piece this section tackles. Let's say we know what the hazards are in a product, and we know they got into your home. Now, can they actually get from your home into your body?

There are three ways this could possibly happen: inhalation, ingestion, and dermal absorption.

• Inhalation is the route that matters most. VOCs, sVOCs, and fine particles all move through indoor air, and we breathe constantly. Anything airborne has a direct path to the lungs, and the smallest particles can cross into the bloodstream from there.
• Ingestion sounds like it shouldn't apply to home products, but it does, mostly through dust. We touch surfaces, then touch our faces, and small amounts of settled sVOCs, particles, and heavy metals end up swallowed. Children do this more than adults (60 mg/day of dust eaten daily on average), but adults do it too (30 mg/day).
• Dermal absorption is the narrowest route, but still a viable one. Skin is a strong barrier for most substances, which is why showering or bathing in water with trace lead contributes far less to body burden than drinking it. The substances that do absorb meaningfully through skin tend to be sVOCs like flame retardants and phthalates, especially when contact is prolonged: sitting on a treated couch for hours, sleeping on a treated mattress, wearing fabric with stain or water repellents against your skin all day.

All three routes apply to all of us. You breathe indoor air around the clock, you touch and incidentally ingest household dust whether or not you've thought about it, and you handle objects that could deposit substances onto your skin. But exposure isn't dose. Being exposed to something doesn't mean your body is taking it on in an amount that matters.

Once you've established that a possible exposure exists, the work shifts to reducing the chance your body accumulates a meaningful dose. That's the role of mitigation, and the strategies are largely the same regardless of which substance you're dealing with.

The useful consequence is that you don't have to sort which route applies to which hazard. Mitigation handles all three the same way: ventilate daily to reduce VOC exposure, wet-dust and HEPA-vacuum to reduce sVOCs and particles, and keep hot or acidic food off materials that may contain heavy metals.

We have our first two boxes filled with more certainty than where we started. Now let's see what we can do for our Dose box.