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Published 17:27 20 Apr 2018 BST
The star rating is a measure of how much UVA is blocked relative to the UVB blocking.
UVB causes burning but UVA causes the carcinogenic damage. — Jonathan Hume (@IamMrJ) April 19, 2018
an SPF50 with a 1 Star rating would offer little protection against UVA while a SPF15 with 5 stars may be offering more.
— Jonathan Hume (@IamMrJ) April 19, 2018
So to protect yourself from both UVA and UVB, you want at least an 4 or 5 Star SPF30.
That will block at least 90% of UVA as well as UVB.https://t.co/zmod5Wm9Zv — Jonathan Hume (@IamMrJ) April 19, 2018
These aren't necessarily expensive.
Here are two examples from Wilkos, their own brand (£2 per 100ml) and Garnier (£9.33 per 100ml). The Wilkos is SPF50, 5 Star. The Garnier is SPF30 and has no clear Star rating. The cheapo one would be safer. pic.twitter.com/PPlIGoQ60Y — Jonathan Hume (@IamMrJ) April 19, 2018
TL;DR? You need protecting from both UVA and UVB, and you want at least an 4 or 5 Star SPF30. Always check the bottle before you buy.The Garnier one has "advanced UVA UVB protection" which is basically meaningless technobabble.
Always go with the ones that give you their actual numbers. — Jonathan Hume (@IamMrJ) April 19, 2018
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