16/11/2025
SPF has been a hot topic since the report from consumer group Choice earlier this year finding a number of sunscreens were not providing the protection they claim on their packaging.
While the fallout from this report and the subsequent investigation by the Therapeutic Goods Administration (TGA) is ongoing, one thing is for certain: rigorous testing of SPF levels is a good thing. Though these findings have raised questions on how that testing occurs, and more broadly on what SPF actually is.
SPF stands for Sun Protection Factor. It refers to how much protection a sunscreen provides from Ultraviolet B (UVB) rays, which are most likely to cause sunburn and skin cancer.
The SPF rating indicates how much UVB is blocked from reaching the skin (understanding no sunscreen can ever block 100% of UV rays). SPF50 should allow only around 1/50th of UVB to reach the skin, equal to 2%, meaning it blocks 98% of UVB radiation. SPF30 should allow only 1/30th (3.3%), meaning it blocks around 96.7%, and so on.
It’s important to remember that SPF testing is carried out in laboratories under controlled settings, where sunscreen is liberally applied to a small area of skin which is then exposed to simulated UV light, with results over time compared to unprotected areas of skin.
In reality, a lot of people don’t apply enough sunscreen, miss patches over their body, or don’t wait long enough for it to soak in before sun exposure. Even the best sunscreen won’t be very effective unless applied properly and reapplied every two hours (or after swimming or sweating).
You should also ask your TerryWhite Chemmart Pharmacist about the right sunscreen to suit you and your family, including SPF ratings, water resistance, sport suitability, finish types, and lotion vs spray vs roll-on.
And remember, while it’s important to choose a sunscreen with an SPF of at least 30 (ideally 50+), slopping that on is only one part of sun protection. Don’t forget to slip on protective clothing, slap on a wide-brimmed hat, seek shade and slide on sunglasses 😎
Taking the right precautions and not relying on sunscreen alone is the best way to enjoy our beautiful Aussie summers while staying sun smart!
📝 Matthew Pilkington
📍 TerryWhite Chemmart Fourways Devonport and Kingston Plaza, Tasmania