Often the first thing noticeable on a bottle of sunscreen is the SPF rating on the front. If you turn over to the back label you can usually find the Star rating, typically ranging from one-to-five stars, as shown below.
The higher the number of stars, the more balanced protection offered, i.e. blockade of UVA and UVB radiation. The star rating represents the ratio of UVA-to-UVB protection afforded. You may sometimes see an encircled UVA logo (refer below) on the label, this indicates that the product has been approved by the EU. In practice, it is an equivalent way of saying that the product provides good balanced protection against both UVA and UVB.
Answered by Alex Kelleher, MD