Expatriate health insurance customers might want to consider purchasing a stronger sunscreen.
While the National Institute for Health and Clinical Excellence (NICE) states that SPF15 is sufficient if applied adequately, it has been suggested that too many people do not use enough of the cream for this to protect them.
The Drug and Therapeutics Bulletin noted that many people have been found to be applying between 0.4 and 1.5mg/cm squared, instead of the standard recommendation of 2mg/cm squared.
Dr Ike Iheanacho, the editor of the bulletin, said: "NICE's recommendation to use sunscreens with an SPF as low as 15 is a blunder that overlooks the key evidence and is not in the best interests of public health.
"This advice needs urgent review and correction."
Using SPF30 was advised by the journal because it is more reliable at protecting against sunscreen in the majority of cases.