Sunscreens with SPF 30 along with four or five-star rating to indicate broad-spectrum ultraviolet screening effect are more reliable and provide more sun protection.
Experts have
suggested that Britons should use stronger sunscreens. They feel sunscreens with
SPF 30 along with four or five-star rating to
indicate broad-spectrum ultraviolet screening effect are more reliable, provide more sun protection and are sufficient to
prevent sunburn under most circumstances. Sunscreens with SPF 15 are not advisable
as people
typically apply much less cream than is recommended by the manufacturers and do
not reapply it as often as they should.
An editorial
in the Drugs and Therapeutics Bulletin (DTB) has stated that previous
recommendations by the National Institute for Health and Clinical excellence (Nice)
that SPF 15 UVA and UVB sunscreens would
be sufficient is not in public interest. Sunscreens with SPF 15 offer protection
if they are applied at a thickness of 2mg/cm
2 but as people using
these sunscreens apply much less than this quantity they do not get the
required protection. Also sunscreens have a tendency to easily run off the skin
and require frequent re-application which becomes a costly affair.
If one is to use a sunscreen with SPF 15 adequately
then whole body coverage for a single application
for an adult at 2mg/cm
2 requires around 35ml of sunscreen and
applying this quantity every 2-hours would require 200ml sunscreen every 2-3
days. Therefore, DTB has requested Nice for an urgent review and correction of
their advice.
Source-Medindia