The Testosterone Blueprint
Free home auditTakes 2 minutesNo email needed

How much is your home quietly nudging your hormones?

Everyday products, from shampoo to food packaging, can carry endocrine-disrupting chemicals. Walk through your home, tick what you use, and get your personal exposure score, plus the swaps that matter most.

What this audit checks

Some everyday products contain endocrine-disrupting chemicals (EDCs), substances that scientific and regulatory bodies including the Endocrine Society, the US National Institute of Environmental Health Sciences and the European Chemicals Agency have flagged as potentially interfering with hormones. The best-known examples are phthalates in fragrance and soft plastics, bisphenols such as BPA in food-can linings and till receipts, PFAS in non-stick cookware and stain-resistant fabrics, parabens in some cosmetics, and triclosan in some antibacterial products.

This audit does not measure anything in your body. It counts how many recognised sources sit in your daily routine, weights them by how much each one typically contributes, and shows you which few changes remove the most exposure for the least effort and money.

Where these chemicals turn up in an ordinary home

The bathroom is usually the largest single contributor, because leave-on products are applied to skin every day and stay there. Scented deodorant, moisturiser, shampoo and body spray are the repeat offenders, and fragrance is the common thread: on most labels the word "parfum" stands for a mixture the manufacturer does not have to itemise.

The kitchen matters because of heat. Warmth is what moves compounds out of packaging and into food, which is why reheating in plastic, scratched non-stick pans and old storage tubs carry more weight here than the same materials used cold. Tinned food and till receipts add smaller amounts of bisphenols.

The bedroom and laundry contribute through the things you spend eight hours next to and the residues left on fabric. Air fresheners, plug-ins, scented candles, heavily fragranced detergents and fabric conditioners all add fragrance chemicals to indoor air. Household dust is a genuine route too, since flame retardants and other semi-volatile compounds settle into it.

Food and habits cover the routes that are easy to overlook: drinking from bottles left in a hot car, takeaway containers, and how often you ventilate the rooms you live in.

What the evidence does and does not show

Honesty matters more than alarm here. The laboratory evidence that these compounds can interfere with hormone signalling is solid. What is far less settled is how much difference typical, low-level, everyday exposure makes to an individual person's health, because that question is extremely hard to study well and the research is still developing.

So the reasonable position sits between two unhelpful extremes. It is not true that this is proven to be harming you. It is also not true that it is nothing. What is true is that most of the largest sources are cheap and simple to reduce, and that reducing them costs you very little even if the eventual answer turns out to be modest.

Nothing on this page is a diagnosis, and a high score does not mean you are ill. If you have symptoms that concern you, that is a conversation for a doctor, not a checklist.

The changes that make the most difference

If you do nothing else, do these three. Stop reheating food in plastic and use glass or ceramic instead, because heat plus plastic is the single most consistent route in a normal kitchen. Switch your daily leave-on products to fragrance-free versions, since these are the ones that stay on your skin all day rather than being rinsed off. Ventilate more and use fewer air fresheners, because indoor air and settled dust carry more than most people expect.

Occasional exposure is not the problem worth solving. Daily habits are. A perfume worn to a wedding is not the same as a scented moisturiser applied every morning for a decade, and the audit weights them accordingly.

Does this measure my hormones?
No. It does not measure the chemicals in your body or your hormone levels, and it cannot. It estimates how many common sources of endocrine-disrupting chemicals are in your daily environment. A higher score is not a diagnosis and does not mean anything is wrong with you.
Do I need to read labels or scan products?
No. Every question can be answered from memory in about two minutes. There is nothing to scan and no ingredient list to read.
Which chemicals does it look at?
Phthalates, bisphenols including BPA and BPS, PFAS, parabens, triclosan, some UV filters and flame retardants. They were chosen because they are recognised as possible concerns and because exposure to them is common, everyday and avoidable.
How do I lower my score?
Start with the three swaps the audit ranks highest for you. The biggest everyday sources, such as heating food in plastic, scented leave-on products and air fresheners, tend to be the cheapest and easiest to change.
Are endocrine disruptors actually dangerous?
The honest answer is that it depends on the compound and the dose, and that the science on typical everyday exposure is still developing. Laboratory evidence that these substances can interfere with hormone signalling is strong. Evidence about how much low-level household exposure affects an individual's health is much weaker. That uncertainty is a reason to reduce the easy sources, not a reason to panic.
Is "fragrance-free" the same as "unscented"?
No, and this catches a lot of people out. "Unscented" products can contain masking fragrance to cover the smell of the base ingredients. "Fragrance-free" is the wording to look for on daily leave-on products.
Do I need to throw things away?
No. Replacing a scratched non-stick pan is worth doing, but almost everything else can wait until the product runs out and you buy the next one. Swapping at the point of repurchase costs nothing and gets you to the same place.
Is my data stored or shared?
Nothing you tick is sent anywhere. The audit runs entirely in your browser, there is no account, and no email is needed to see your score and your swaps.

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