

Z-Block SPF 50 gel is listed as a water-based sunscreen. The product listing gives 25% zinc oxide. SPF describes protection against UVB-related sunburn under test conditions; it does not, by itself, tell you the level of UVA protection. Check the product label for its ingredients, UVA information, water-resistance claims and directions before relying on it. The gel format may suit adults who prefer a water-based sunscreen.
Sunscreen is one part of sun protection, alongside shade and clothing. Apply and reapply it according to the label, particularly after swimming, sweating or towelling. Keep the gel away from the eyes and stop use if a reaction occurs. If you use tretinoin, ask your prescriber about sun protection. Tretinoin is prescription-only in the UK and can increase skin sensitivity to sunlight.