Did you know that scorching summer temperatures don’t just take a toll on your skin — they can also wreak havoc on the products you use to protect it?
According to Dr Laurence Orlando from Monash University’s Faculty of Pharmacy and Pharmaceutical Sciences, high temperatures can significantly compromise the effectiveness of sunscreens and cosmetics.
This makes it crucial to store your products properly during the hotter months!
“High temperatures can significantly impact both cosmetics and sunscreens, compromising their effectiveness and usability,” says Dr Orlando.
Sunscreens, particularly those that contain active ingredients like avobenzone and oxybenzone are especially vulnerable to heat.
“Prolonged exposure to high temperatures—such as inside cars or beach bags—can degrade their UV-filtering abilities, reduce efficacy, and cause physical changes like separation, runniness, or a grainy texture.
“This instability can lead to uneven application and reduced sun protection, necessitating more frequent reapplication, especially during intense heat or sweating,” says Dr Orlando.
Cosmetics aren’t immune to the heat either!
“Creams and lotions may separate, lipsticks and balms can melt, and natural or water-based products may foster bacterial growth,” adds Dr Orlando.
“Heat can also oxidize essential oils and active ingredients, altering their scent or causing irritation.”
How to safeguard your products during summer
So, how can you safeguard your beauty and skincare products during summer?
Dr Orlando shares the following tips:
- Smart storage: “To prevent these issues, it’s essential to store sunscreens and cosmetics in cool, shaded areas.”
- Wise travel: “Use insulated bags or ice packs when [taking cosmetics and sunscreens] outdoors.”
- Regular inspection: “Monitor products for changes in texture, smell, or appearance.” These changes may mean your products are no longer safe or effective.
Consider ‘reliable alternatives’
Dr Orlando also suggests using mineral sunscreens, which are more heat-stable and contain ingredients like zinc oxide or titanium dioxide, for reliable UV protection during extreme heat.
“It is recommended to use mineral sunscreens, with heat-stable ingredients like zinc oxide or titanium dioxide, as a reliable alternative during extreme heat, as they maintain their stability and provide effective UV protection.”
