Are Synthetic UV Filters Safe? Understanding the Science
Are Synthetic UV Filters Safe? Understanding the Science
When choosing a sun cream, you'll often see products described as either mineral or chemical. The term "chemical" refers to synthetic UV filters, ingredients that have been widely used for decades to protect the skin from the sun's harmful ultraviolet (UV) rays.
In recent years, these ingredients have attracted increasing scientific interest. Researchers have explored how they behave in the body, their potential effects on the environment and whether some may influence our hormones.
So, what does the science actually say?
What Are Synthetic UV Filters?
Synthetic UV filters are laboratory-made ingredients that absorb ultraviolet radiation before it can damage the skin.
They are commonly found in:
Sunscreens
Facial moisturisers with SPF
Foundations and BB creams
Lip balms
Daily skincare products
Unlike mineral UV filters such as zinc oxide, which remain on the surface of the skin, synthetic UV filters absorb UV energy and convert it into tiny amounts of heat.
Both approaches are designed to reduce UV damage and help prevent sunburn.
Why Are They Being Studied?
Scientists are continually reviewing the safety of cosmetic ingredients as new evidence becomes available.
Over the past decade, some synthetic UV filters have attracted particular attention because studies have shown they can be absorbed through the skin and detected in blood and urine following repeated use.
Researchers have also investigated whether some ingredients may interact with hormone systems, persist in the environment or affect marine ecosystems.
While research is ongoing, many people choose to follow a precautionary approach by reducing their exposure where practical.
Synthetic UV Filters To Look Out For
If you would prefer to minimise your exposure to synthetic UV filters receiving the greatest scientific attention, these are some of the names to look for on ingredient labels.
These ingredients have been investigated for a variety of reasons, including their potential endocrine activity, environmental persistence and effects on marine life. Not every ingredient has the same safety profile, and research continues to evolve as new evidence becomes available.
Hormones And Endocrine Disruption
One reason these ingredients have received attention is because some have shown endocrine-disrupting activity in laboratory and animal studies.
Endocrine disruptors are chemicals that may interfere with the body's hormonal signalling. Hormones regulate many important processes, including growth, metabolism, reproduction and development.
Breast Cancer UK identifies several synthetic UV filters as chemicals of concern because of their potential endocrine-disrupting properties. This doesn't mean every exposure will cause harm, but it does support further research and allows consumers to make informed choices.
Environmental Concerns
The discussion isn't limited to human health.
Several synthetic UV filters, including oxybenzone and octinoxate, have also been studied for their potential impact on coral reefs and marine ecosystems.
Some destinations, including Hawaii and Palau, have introduced restrictions on sunscreens containing certain UV filters in an effort to reduce pressure on vulnerable coral reef environments.
Many people therefore choose mineral sunscreens when swimming in the sea or visiting sensitive marine habitats.
What About Regulations?
Cosmetic ingredients are continually reviewed by regulators as new scientific evidence emerges.
In both the UK and Europe, sunscreen ingredients must undergo safety assessments before they can be used in cosmetic products. As research develops, permitted concentrations and approved ingredients can change.
This ongoing review process reflects the fact that scientific understanding continues to evolve.
A Precautionary Approach
At The Green Woman, we believe people should have access to clear, evidence-led information so they can make choices that reflect their own values.
For those wishing to take a precautionary approach, choosing a mineral sun cream made with non-nano zinc oxide offers an alternative to formulations containing synthetic UV filters.
We believe that reducing unnecessary exposure to chemicals of concern, where suitable alternatives exist, is a sensible and practical approach for many families.
Looking For A Natural Alternative?
Freedom Mineral Suncream is made with non-nano zinc oxide and certified organic plant oils to provide broad-spectrum UVA and UVB protection.
Rather than relying solely on sun cream, we also encourage a balanced approach to sun care by:
Building sun exposure gradually.
Avoiding sunburn.
Seeking shade during peak UV hours.
Wearing protective clothing and hats.
Using mineral sun cream when additional protection is needed.
Frequently Asked Questions
What are synthetic UV filters?
Synthetic UV filters are laboratory-produced ingredients used in sunscreens and SPF skincare products to absorb ultraviolet radiation and help protect the skin from sun damage.
Which synthetic UV filters are most commonly used?
Some of the most common include oxybenzone (benzophenone-3), octinoxate (ethylhexyl methoxycinnamate), octocrylene, homosalate and avobenzone.
Why do some people avoid synthetic UV filters?
Some people choose to avoid certain synthetic UV filters because of ongoing research into endocrine disruption, chemical absorption and environmental impacts. Others simply prefer products with shorter, easier-to-understand ingredient lists.
What is the alternative to synthetic UV filters?
Mineral sun creams use ingredients such as non-nano zinc oxide or titanium dioxide to provide UV protection and are often chosen by people looking for a simpler approach to sun care.
Are all UV filters the same?
No. Different UV filters have different chemical structures, functions and safety profiles. Ongoing research continues to improve our understanding of each individual ingredient.
Further Reading
First published June 2023. Updated June 2026.