When to apply sunscreen

When to apply sunscreen? Popular topics and scientific guides on the Internet in the past 10 days

As the high temperatures in summer continue, the topic of sun protection has once again become a hot topic on the Internet. In the past 10 days, the cumulative readings of topics such as #sunscreen use misunderstandings and #sunscreen need to be used every day have exceeded 300 million times. This article combines the latest data and expert advice to answer the core questions about sunscreen use.

1. Data on hot topics related to sun protection across the Internet (last 10 days)

2. Five major situations when you must apply sunscreen

3. Detailed explanation of sunscreen usage time points

1.Use immediately after morning skin care: Apply within 5 minutes after completing basic skin care (moisturizer) to ensure complete film formation. Experimental data shows that an interval of more than 10 minutes will reduce the sun protection effect by 30%.

2.20-30 minutes before going out: Chemical sunscreen needs to be applied in advance to allow it to be fully absorbed. Research from the Department of Dermatology of Peking Union Medical College Hospital shows that the sunscreen effect of immediate application is only 60% of the expected value.

3.Prime time for touch-up: Determined based on activity intensity:

• Reapply immediately after swimming/sweating
• Reapply every 2 hours during outdoor activities
• Office environment: Reapply once at noon

4.Winter/cloudy days cannot be ignored: Clouds can only block 50% of UV rays, and reflection from snow in winter can increase UV intensity by 80%.

4. Data comparison of common misunderstandings

5. Experts recommend the use process

1.Dosage standard: The size of a 1 yuan coin (approximately 1ml) is required for the face. Insufficient amount will cause the SPF value to decrease exponentially.

2.Application technique: Push in one direction rather than in circles to avoid damaging the film. Experiments show that applying it in a circular motion will reduce the protective power by 25%.

3.Matching suggestions: Combined with antioxidant essence (vitamin C) to improve anti-photoaging effect. The latest research in 2024 shows that this combination can reduce collagen loss by 47%.

4.Special groups: Pregnant women are recommended to choose physical sunscreen (zinc oxide/titanium dioxide), and children need special formula (no alcohol or fragrance).

Remember: sun protection is the most cost-effective anti-aging investment. Research from the American Academy of Dermatology has confirmed that people who use sunscreen daily are 10 years younger at age 50 than those who don't (the difference in wrinkles is visible to the naked eye). Choose the right sunscreen product and know the right time to use it to keep your skin protected.