Six chemicals commonly used in sunscreen absorb into and remain in the bloodstream for 10 days on average, sparking concerns they could be toxic and could pose health risks.

The results of a study by the US Food and Drug Administration (FDA) were released on Wednesday and confirmed concerns raised in a study last year by the same researcher.

The researcher said the findings don't mean people should avoid sunscreen, which can help to prevent skin cancer. Credit:Alamy

An Australian expert believes, depending on the health implications, there could be a shift from sunscreens containing absorbing chemicals towards those that simply form a barrier on the skin.

The trial used 48 volunteers to assess the absorption of six ingredients - avobenzone, oxybenzone, octocrylene, homosalate, octisalate and octinoxate - in four sunscreen products, lotions and sprays.