SPF testing: What GPs should know about sunscreen controversies

When media reports suggest that sunscreens “fail” SPF testing, GPs are often the first to field patients' concerns. In this episode of Life by a Thousand Cuts, A/Prof Tony Dicker takes a closer look at recent media controversies and applies a clinical lens to discuss whether sunscreens work and are safe to use. In the episode, he discusses SPF testing and how it is not absolute; small variations in testing conditions or sample batches can change results, even among regulated products. Despite this, Australia’s regulatory standards remain among the most stringent globally; unlike in many other countries, sunscreens are classed as therapeutic goods and regulated by the TGA.

A “failed” SPF test result doesn’t necessarily mean a product is unsafe or ineffective. It often reflects marginal variation rather than complete loss of protection. Affected manufacturers have acted responsibly by voluntarily withdrawing products to investigate further, which is an important sign of quality control, not negligence.

A/Prof Dicker reiterates that GPs play a vital role in patient reassurance and countering misinformation, since sunscreen remains a key element of skin cancer prevention, alongside other sun safety measures like shade and clothing.

“Some sun protection is better than none. The world isn’t black and white — it’s grey. Understanding that nuance helps us guide patients confidently.” - A/Prof Tony Dicker

Watch this episode here.

Life by a Thousand Cuts 

This podcast series is designed to help you enhance your clinical decision-making, procedural skills, and confidence in skin cancer management. Focus on real-world cases, surgical techniques and tips, journal article reviews, diagnostic and management insights, and guest interviews with GPs and specialists.

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