An active ingredient in sunscreens, 2-phenylbenzi-midazole-5
(PBSA), which is used to absorb ultraviolet B (UVB), was found
to damage DNA when exposed to sunlight in a test tube.
The researchers from Queen's University in Belfast (N. Ireland)
feared that, if it caused similar changes to skin cells, this
could lead to skin cancer. Although there was no definite proof
that this was occurring, the researchers recommended that an alternative
UVB absorber is found.