Sun protection is a pivotal part of skin health management. It's not only about maintaining beautiful skin but also involves critical measures for cancer prevention and anti-aging. To achieve effective sun protection, a deep understanding of sun protection science and the correct application methods are essential.

Selection and Understanding of Sun Protection Products

  1. Scientific Interpretation of SPF and PA Values:

    • SPF (Sun Protection Factor): A metric that quantifies a product's ability to shield against UVB rays, which are primarily responsible for causing skin redness and sunburn. The SPF value is calculated based on the ratio of the time it takes for the skin to start reddening with and without sunscreen application. For example, SPF 30 theoretically extends the time it takes for the skin to redden by 30 times compared to unprotected skin.
    • PA (Protection Grade of UVA): Measures the product's ability to protect against UVA rays. UVA penetrates deeper and is a primary cause of early skin aging and photoaging, with prolonged exposure also increasing the risk of skin cancer. The PA rating is indicated by the number of plus signs (from + to +++), with more pluses indicating stronger protection.

  2. Choice of Product Types:

    • Chemical Sunscreens: Absorb ultraviolet light through chemical reactions, converting it into heat or other forms of radiation. Suitable for users looking for a lightweight texture experience.
    • Physical Sunscreens: Reflect or scatter ultraviolet light physically. Containing ingredients like zinc oxide or titanium dioxide, they are appropriate for sensitive skin or those seeking immediate protection.

Correct Application of Sun Protection

  1. Proper Amount and Method of Application:

    • Use about 1/4 teaspoon of sunscreen for the face and a palm-sized amount (or about two milliliters) for each body part exposed.
    • Sunscreen should be applied evenly, paying special attention to often-neglected areas like behind the ears, neck, and backs of the hands.

  2. Frequency and Timing of Reapplication:

    • Reapply every two hours and immediately after swimming or sweating heavily.

Advanced Sun Protection Strategies

  1. Integrating Sun Protection with Other Skincare Steps:

    • Using serums rich in antioxidants or vitamin C products before applying sunscreen can enhance the skin's defense against UV light and reduce free radical damage.

  2. Comprehensive Protective Measures:

    • In addition to applying sunscreen, wearing long-sleeved clothing, wide-brimmed hats, and UV-protection sunglasses are necessary, especially during outdoor activities.

  3. Environmental Adaptivity in Sun Protection:

    • Adjust sun protection measures based on the environmental UV index, taking stricter precautions on days with higher UV levels.