Sunscreen, decoded

UVA and UVB

UVB is the main cause of sunburn; UVA penetrates deeper and contributes to ageing and pigment. Both are linked to skin cancer.

'Broad-spectrum' means a product is designed to protect against both.

Choose broad-spectrum protection.

How much, how often

Most people apply far less than the amount used in testing. Be generous, and reapply after swimming, sweating or towelling, and every couple of hours in strong sun.

Beyond the bottle

Shade, clothing, hats and sunglasses matter just as much. Sunscreen is one part of a wider approach.