Sunlight is an ultraviolet (UV) resource, and it contains UVA and UVB rays that can affect the skin. Regular exposure can cause sunburn, premature skin aging and the risk of skin cancer.
Sunscreen is part of a whole sun-protection routine. Wearing protective clothing, seeking shade and avoiding excessive direct sun exposure, especially when UV levels are high, can also reduce exposure.
But when it comes to sunscreen, a lot of people ask: Should you choose a chemical or physical formula?
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What is physical sunscreen?
Physical sunscreens are often called mineral sunscreens. They contain zinc oxide or titanium dioxide as their active ingredients.
These ingredients work mostly by interacting with UV radiation at the skin surface, including absorbing and reflecting/scattering some radiation. Modern mineral sunscreens are formulated to provide broad-spectrum protection when appropriately tested and labelled.
Mineral formulas are often considered by people with sensitive skin because zinc oxide and titanium dioxide are generally well tolerated.
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However, some mineral sunscreens can leave a white or pale cast, particularly on darker skin tones. Newer formulations may reduce this effect.
What is chemical sunscreen?
Chemical sunscreens contain organic UV filters that absorb UV radiation and convert it into a small amount of heat that is released from the skin.
Different products use different combinations of UV filters. Depending on the formulation, chemical sunscreens can provide broad-spectrum protection against UVA and UVB radiation.
Many people like these products because they tend to be lightweight and blend easily without leaving a noticeable white cast.
What is the difference between chemical and physical sunscreens?
In the end, however, the difference is in the type of UV filters used rather than whether one sunscreen blocks the UV rays and the other absorbs them; the difference is not whether or not the sunscreen’s UV filters are effective.
Physical/Mineral Sunscreen
- Common ingredients: Zinc oxide and titanium dioxide.
- Texture: Can sometimes feel thicker or heavier on the skin.
- White cast: May leave a visible white or pale cast, depending on the formulation and skin tone.
- Sensitive skin: Often well tolerated, although individual reactions can vary.
- UV protection: Broad-spectrum mineral sunscreens are available.
Chemical Sunscreen
- Common ingredients: Uses various organic UV filters.
- Texture: Often lightweight and easy to spread.
- White cast: Usually less noticeable than with traditional mineral formulas.
- Sensitive skin: Suitability depends on the individual formulation and the person's skin.
- UV protection: Broad-spectrum chemical sunscreens are available
The exact performance of the product depends on the formulation and whether the product has been properly tested.
What sunscreen should you use?
There is no single sunscreen that is the best for everyone. The key is to choose a broad-spectrum sunscreen with a good SPF that you’re comfortable applying generously and regularly.
People who have sensitive or reactive skin may prefer a mineral formula and some may prefer the texture and finish of a chemical sunscreen.
The right choice is ultimately the one that fits your skin, lifestyle and daily routine.
How to use sunscreen properly?
Using the right product is only part of effective sun protection. Apply sunscreen generously to exposed skin and reapply as directed, especially after swimming, sweating or towel drying.
Don’t forget commonly missed areas such as the ears, neck, hands and the top of the feet.
Sunscreen must also be used in conjunction with other protective measures, including shade, sunglasses and protective clothing.
The Bottom Line
Both chemical and physical sunscreens can provide effective UV protection when properly formulated and used. Personal preference, skin sensitivity, texture and cosmetic finish are factors that determine the choice.
Instead of trying to determine what category is generally 'better', look for a product that you will use consistently and correctly.
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