Understanding the Differences Between Mineral and Chemical Sunscreens
In recent years, mineral sunscreens have become increasingly popular due to claims that they are gentler or safer than their chemical counterparts. However, the actual differences between these two types of sunscreens are more technical than many consumers realize, which can lead to misunderstandings about their health effects.
The main distinction between mineral and chemical sunscreens lies in their active ingredients and how they protect against ultraviolet (UV) rays. Both types of sunscreen absorb UV radiation and convert it into heat, which is then released from the skin. Mineral sunscreens, sometimes referred to as physical sunscreens, also create a thin barrier that scatters UV rays away from the skin. This dual mechanism of protection is one reason why some people prefer them.
Despite this, the terms “mineral” and “chemical” can be misleading since all sunscreens contain chemicals. Many mineral-based formulas also include other substances known as “boosters” to enhance the effectiveness of the active ingredients. According to Christian Surber, a dermatopharmacologist at the University of Zurich and the University of Basel, more accurate descriptors could be “soluble” and “insoluble” filters. Soluble filters can permeate the skin, while insoluble ones cannot.
Sunscreen and Health Concerns
Concerns about the health effects of sunscreens are not new. In 2021, the European Commission Scientific Committee on Consumer Safety (SCCS) evaluated the safety of three non-mineral UV filters—oxybenzone, homosalate, and octocrylene—due to concerns about their potential endocrine-disrupting properties. The SCCS found that homosalate and oxybenzone were unsafe at common concentrations, while octocrylene was considered safe up to 10 percent, though the data was inconclusive.
One study estimated that a person would need to apply sunscreen daily for 277 years to experience the same hormone-disrupting effects observed in rats fed oxybenzone in a lab. Despite this, the European Commission introduced new restrictions in 2022 to limit the use of these filters in sunscreens.
Laura Clays from Euroconsumers and Test-Achats noted that these ingredients are now rarely seen on the market because manufacturers are aware of the potential issues and the likelihood of future restrictions.
Skin Sensitivity and Effectiveness
For individuals with sensitive skin, mineral sunscreens are often preferred because they are less likely to cause irritation. These sunscreens typically use ingredients like zinc oxide and titanium dioxide. However, consumer tests conducted by Clays revealed that some mineral-only formulas provided weaker sun protection than their labels indicated. This means that in many cases, products containing only mineral filters may not offer sufficient protection.
The physical layer created by mineral sunscreens can also pose challenges. Users must ensure full coverage, and reapplication is essential. According to Clays’ tests, people tend to reapply mineral sunscreens less frequently, partly due to the white residue they leave on the skin.
Safety and Effectiveness
Both chemical and mineral sunscreens are generally considered safe and effective when used correctly, according to dermatologists and health authorities. Surber emphasized that all sunscreen filters have undergone regulatory assessments and are deemed safe.
Ultimately, skin experts agree that the best sunscreen is the one that individuals will consistently use. Clays stated, “There’s really no big difference, health-wise, between the two.” The key is to choose a product that suits individual preferences and ensures regular application for optimal protection.