Why might some people be concerned about nanoparticles in products?

Concerns regarding nanoparticles in products largely stem from the fact that health effects are not fully investigated. Nanoparticles, due to their small size and unique properties, can behave differently than larger particles of the same substance. This means that their interaction with biological systems, potential toxicity, and long-term effects may not be well understood. As a result, there can be uncertainty surrounding their safety for human health and the environment. While some may see benefits in terms of product efficiency or environmental impact, the lack of comprehensive research into the implications of exposure to nanoparticles raises valid health concerns among scientists and consumers alike.