You wake up. You brush your teeth. You shower. You put on deodorant. Maybe some moisturiser. Maybe sunscreen. Maybe a spritz of something that smells nice.

By the time you leave the house you have applied somewhere between 9 and 15 personal care products to your body. Most people do this every single day without once looking at the ingredients list.

Darin Olien spent years looking at those lists. And what he found became a New York Times bestselling book called Fatal Conveniences a deep investigation into the everyday products our culture has told us are safe, necessary and completely fine. Spoiler: some of them are not.

Over the past 50 years, more than 80,000 chemicals have been introduced into consumer products. Of those only a small fraction barely 10% have undergone safety assessments.

Let that land. Nine out of every ten chemicals currently sitting in products on supermarket shelves have never been fully tested for their effects on human health. Not because they were proven safe. Because nobody checked.

In the United States, the law that governs cosmetic safety has not been meaningfully updated since 1938. In contrast the European Union has banned or restricted over 1,400 chemicals from cosmetics. The US has banned 11. Same products sold in different countries with wildly different ingredient lists depending on where you live.

Olien's argument is not that every product will kill you. It is that we have been running a 50 year experiment on ourselves without consent and the results are starting to show.

Before we get into the products you need to understand one term. Because it keeps coming up and most people have no idea what it means.

Your endocrine system is basically your body's messaging service. It produces hormones chemical signals that travel through your bloodstream and tell your organs what to do. When to grow. When to stop. When to release energy. When to reproduce. Your entire body runs on these signals.

An endocrine disruptor is a chemical that interferes with that messaging system. It can mimic a hormone, block a hormone or completely confuse the signal. Imagine someone hacking into your body's WhatsApp group and sending fake messages to your organs. Your body receives the message and acts on it except the instruction was never supposed to be sent.

The effects of this kind of disruption over time can include hormonal imbalances, fertility problems, thyroid dysfunction, developmental issues in children and an increased risk of certain hormone related cancers.

Now here is the part that should get your attention. Several of the most common endocrine disrupting chemicals found in nature are measured in parts per billion. The amounts found in everyday personal care products are sometimes thousands of times higher than that. And you are applying them to your skin every single morning.

Your deodorant:

Think about what deodorant actually does. You apply it right next to your lymph nodes the small glands that are part of your immune system and sit directly under your armpit. Then you often apply it right after shaving, when your skin has tiny cuts that make absorption even easier.

The active ingredient in most antiperspirants the ones that stop you sweating is aluminium. Aluminium works by forming a plug inside your sweat glands to block them. That is fine in theory. The issue is what aluminium does when it gets into your body.

Aluminium belongs to a group called metalloestrogens. That means it behaves like oestrogen once it is inside you. And oestrogen, when there is too much of it in the wrong place, can signal certain cells to grow and multiply when they should not.

Scientists have found higher concentrations of aluminium in breast tissue samples than in blood which suggests the body is not just passing it through. It is staying. Whether that leads to cancer is genuinely still being researched and the current evidence does not confirm a direct link. A major 2024 review of over 7,000 people found no confirmed increased risk of breast cancer from antiperspirant use.

But here is the thing. Natural aluminium free deodorants exist, they work and they cost the same. So why keep the risk on the table at all?

Your toothpaste:

You put this in your mouth twice a day. Every day. For your entire life. And the inside of your mouth absorbs things faster than almost anywhere else on your body.

A 2024 investigation across eight European countries found suspected hormone disrupting chemicals in nearly half of all toothpastes tested. The main ones to know about are triclosan and parabens.

Triclosan is an antibacterial ingredient. It sounds useful who does not want antibacterial toothpaste? The problem is that triclosan does not stay in your mouth. It gets absorbed into your bloodstream. The CDC tested a sample of Americans and found triclosan in the urine of 75% of people tested. It has been linked to thyroid hormone disruption in animal studies and declining thyroid hormone levels in humans with high exposure. The FDA actually banned it from hand soaps in 2016 because companies could not prove it was safe for daily long term use. It is still allowed in toothpaste.

Parabens are preservatives that keep products from going off on the shelf. They are also oestrogen mimics meaning your body can mistake them for oestrogen. They have been detected inside human breast tumour tissue. That does not prove they caused the tumour. But finding them there at all is not reassuring.

The good news is that simply switching to a paraben free and triclosan free toothpaste is enough. You do not need anything fancy. You just need to read the label.

The hidden ingredient in almost everything: fragrance

Here is the one that most people miss entirely.

When a product label lists "fragrance" or "parfum" as an ingredient, that single word can legally conceal hundreds of individual chemical compounds none of which need to be disclosed. The fragrance loophole exists because the formula is considered a trade secret.

Olien describes this as the damage that is not always created by the convenience itself, but by a hidden, unnoticed ingredient that comes along for the ride: the preservative, the propellant, the flavouring, the dye, the emulsifier, the completely unnecessary fragrance that is there only to make you love the product a little more.

Many fragrance compounds are phthalates chemicals that help the scent linger. Phthalates are classified as endocrine disruptors. Phthalate metabolites are detected in the urine of over 96% of Americans tested in national health surveys. They are in your shampoo, your moisturiser, your shower gel, your washing powder, and your air freshener. You are absorbing them through your skin and breathing them in every single day.

It is a fair question. Some critics argue that Olien presents individual studies out of context, that the doses of chemicals found in consumer products are far below levels shown to cause harm in studies and that the cumulative exposure argument while theoretically valid has not been directly proven to cause disease in humans at the concentrations we encounter.

The dose makes the poison. That is a legitimate scientific principle. A single application of a product containing triclosan is not going to disrupt your thyroid. The question is what daily application over 30 years does and that is a much harder thing to study.

What is not in dispute is this: the regulatory framework governing what goes into personal care products is outdated, inconsistently enforced and not designed to account for the cumulative effect of exposure to multiple chemicals simultaneously. The precautionary principle which Europe applies more aggressively than the US suggests that chemicals should be proven safe before widespread use, not after.

You do not need to throw everything away tomorrow. Small, consistent swaps are enough.

Read the label before you buy. Look for triclosan, any ingredient ending in paraben, fragrance or parfum, phthalates and BHT. The Environmental Working Group's Skin Deep database at ewg.org rates personal care products by ingredient safety and is free to use.

Switch your deodorant first. If you are going to make one change, this is the highest impact one given the proximity to lymph nodes and breast tissue. Aluminium free natural deodorants have improved dramatically in recent years.

Choose unscented where possible. Unscented products still smell neutral but have avoided the fragrance loophole. This single swap removes a significant source of phthalate exposure from your daily routine.

Look for toothpastes without triclosan or parabens. Most mainstream brands have removed triclosan following regulatory pressure. Check the label. If you want to go further, hydroxyapatite toothpastes are a well researched alternative to fluoride (if you want to know more about fluoride read my other newsletter all about fluoride) that European and Japanese dentistry has used for decades.

Darin Olien did not write Fatal Conveniences to make you afraid of your bathroom cabinet. He wrote it because the system that is supposed to protect you from harmful chemicals in consumer products is not doing its job and someone needed to say so loudly.

You are not helpless. The HERMOSA study proved that switching products reduced chemical exposure within three days. That is not a small thing. It means the choice of what you put on your body this morning is a genuine health decision not just a marketing one.

The products have been convenient. The consequences have not always been.