How sunscreen protects against UVA and UVB

There have been many discussions this year about sunscreen, its effectiveness and its ingredients.

While there are some unknowns, what we’re sure of is sunscreen’s ability to protect us from the sun’s ageing and cancer-causing rays.

Norman and Tegan slip, slop, slap some questions about sunscreen: SPF scandal, endocrine disruptors and vitamin D concerns.

References:

• How does sunscreen work? - Cancer Council 
• Sunscreen: a brief walk through history
• We tested the SPF claims of 20 sunscreens. 16 failed - CHOICE
• TGA statement on CHOICE SPF sunscreen findings 
• Safety Review of Seven Active Sunscreen Ingredients – July 2025 
• Daily sunscreen application and betacarotene supplementation in prevention of basal-cell and squamous-cell carcinomas of the skin: a randomised controlled trial
• Mineral vs chemical sunscreens 
• Can your sunscreen expire? 

If you enjoyed this episode, check these out!

• Is there such thing as TOO much sun protection?
• We all need a daily dose of sunlight — but how much? 
• Can you get away with skipping your daily shower?