Shopping for SPF isn’t always simple. Do you go for sunblock vs sunscreen? And what’s the difference between the two? According to dermatologists, sunblock and sunscreen are, in fact, interchangeable terms. And these terms describe topical products that are used to protect skin from the sun’s harmful UV rays.
An essential step in your daily skincare routine, “sun protection is vital to maintaining skin health and preventing signs of skin aging such as pigmentation, fine lines and wrinkles,” says Dr Alexis Ganite, CeraVe consultant dermatologist. The key, however, is finding the best facial sunscreen that works for you. Nowadays, there are so many sunscreen formulations to choose from – from sunscreen lotion vs spray to sunblock vs sunscreen.
To understand the differences between the two, we asked consultant dermatologists Dr Emma Craythorne and Dr Thivi Maruthappu to break down everything we need to know about sunblock vs sunscreen. Their answers may just surprise you.
Sunblock vs sunscreen: The key differences
If you Google ‘sunblock vs sunscreen’, most results will tell you that sunblock contains physical (or mineral) filters while sunscreen contains chemical filters – and that this is the differentiating factor between the two. But according to Craythorne, this isn’t true.
“A sunblock and a sunscreen are essentially the same thing,” says Craythorne. They both describe products that protect our skin from the sun. “Both can be physical or chemical and some can be a mix of the two.”
While you would like to think that sunblock would block out more of that electromagnetic spectrum than a sunscreen – this is purely an assumption. “They’re both words that can be used interchangeably and are often actually referring to the same thing,” adds Craythorne.
So, to recap, a screen is not just made of chemicals and a block is not just made of minerals.
Should you use sunscreen or sunblock on your face?
You can use either a sunscreen or sunblock on the face and, as we mention above, these terms often refer to the same thing. The most important thing when shopping for SPF is “to look for a broad-spectrum sun protection with a minimum factor of SPF 30 and UVA coverage indicated as 4 stars or above,” says Maruthappu.
If you’re following a skincare routine for sensitive skin, consider formulas containing mineral filters (these can be labelled sunscreen or sunblock) as “they’re better tolerated and less like to irritate than chemical ingredients,” notes Maruthappu. Mineral SPF works by sitting on the skin’s surface (as opposed to being absorbed by the skin).
Can you use sunblock and sunscreen together?
You can use sunblock and sunscreen together, if so desired. Just consider whether it’s a mineral or chemical sunblock and a mineral or chemical sunscreen. One 2021 study showed that zinc oxide (a common mineral ingredient) made chemical products less robust. But according to Craythorne, “the best sunblocks and sunscreens have a combination of both chemical and mineral within them.
“And the mineral sunscreen does not work by reflecting the light away from the skin, it still works by converting that energy to heat – it’s an old mistake that people refer to them as one reflecting and one absorbing and protecting – that’s just not true,” adds Craythorne.
Is it OK to use sunblock every day?
The short answer is yes, absolutely – “sun protection should be applied daily and topped up throughout the day as needed,” says Maruthappu. Something Craythorne tells her clients is that you should consider why you’re wearing sun protection in the first place.
“If you’re wearing it to protect skin from burning and skin cancer primarily, then you only really need to wear an SPF 30 or above between the middle of March until the middle of October in the UK. But if you’re worried about pigmentation, melasma or skin ageing, then you should wear a broad-spectrum sunscreen or sunblock every single day.”
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