More testing and regulation of nanomaterials used in an increasingly number of everyday products is urgently needed, experts said yesterday.

"...having analysed the potential health and environmental impacts which flow from the properties of nanomaterials, we concluded that there is a plausible case for concern about some (but not all) classes of nanomaterials," the Royal Commission experts from the scientific, legal, business and medical communities wrote in a British government-funded report.

In particular the report cited tiny soccer-ball shaped carbon molecules called buckyballs that may have potential uses ranging from novel drug-delivery system to fuel cells, as well as carbon nanotubes and nanosilver.

Recent studies have found buckyballs - short for buckministerfullerenes - may threaten health by building up fat and have linked carbon nanotubes to potential lung cancer risk.

"We are very conscious of the extent to which knowledge about the potential health and environmental impacts of nanomaterials lags significantly behind the pace of innovation, although this could change as new scientific information arises," the study said.