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Consumer products such as food, cosmetics and clothes might be filled with nanomaterials, unknown to us. The use of nanomaterials remains unregulated and they do not show up in lists of ingredients. This is a cause of concern since nanomaterials can be more dangerous than COVID-19 in the long term if no safety action is taken: They are tricky to measure, they enter the food chain, and most alarmingly, they can penetrate cells and accumulate in organs.

Thanks to applications of nanotechnology, many diseases could soon be eradicated; additionally, engineers are developing materials that are 100 times stronger than steel, batteries that last 10 times longer than before, solar panels that yield twice as much energy than old ones, advanced skin care products, and self-cleaning cars, windows and clothes.

Nanotechnology has the potential to become the next industrial revolution. The global market for nanomaterials is growing.

Yet, nanomaterials and their use in consumer products can be problematic. A new study published in Nature Communications recently sheds light on possible harms and what happens to them when they enter an organism. An international team of researchers developed a sensitive method to find and trace nanomaterials in blood and tissues, and traced nanomaterials across an aquatic food chain, from microorganisms to fish, a major source of food in many countries. This method can open new horizons for taking safety actions.

Nanomaterials bind strongly to microorganisms, which are a source of food for other organisms, and this is the way they can enter our food chain. Once inside an organism, nanomaterials can change their shape and size and turn into a more dangerous material that can easily penetrate cells and spread to other organs. When looking at different organs of an organism, it was found that nanomaterials tend to accumulate especially in the brain.

According to the researchers, nanomaterials are also difficult to measure: Their levels in an organism cannot be measured only by using their mass, which is the standard method for measuring other chemicals for regulations. The findings emphasize the importance of assessing the risk of nanomaterials before they are introduced to consumer products in large amounts. A better understanding of nanomaterials and their risks can help policy makers to introduce stricter rules on their use and on the way they are listed in product ingredient labels.

It could be that you are already using nanomaterials in your food, clothes, cosmetic products, etc., but you still don't see any mention of them in the ingredient list. Why? Because they are still unregulated and because they are so small that we simply can't measure them once they're in products.

Particle number-based trophic transfer of gold nanomaterials in an aquatic food chain. Nature Communications (2021). doi.org/10.1038/s41467-021-21164-w

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