What is SPF and what role does sunscreen play?

Sun protection is an essential step in your skincare routine, whatever the season. SPF not only prevents sunburn, but also plays a crucial role in preventing premature ageing and serious health problems such as skin cancer.

However, many people don't fully understand the importance of using sunscreen or choose the wrong products for their skin type.

In this article, you'll discover everything you need to know about SPF, how to choose the right products and why sun protection is essential for your skin's health.

What is SPF and how does it work?

SPF (Sun Protection Factor) measures a sunscreen product's effectiveness in blocking UVB rays, which are responsible for sunburn and skin damage.

How does sunscreen work?

• SPF 15: It blocks about 93% from UVB rays.
• SPF 30: Blocks about 97%.
• SPF 50: Blocks about 98%.

Although the difference between SPF 30 and SPF 50 may seem small, it can be significant for people with sensitive skin or who spend a lot of time in the sun.

How does level 50 sunscreen work?

A product with SPF 50 protects your skin 50 times more than if you didn't use sunscreen.

If your skin starts to turn red after 10 minutes of unprotected exposure, applying SPF 50 extends this time to about 500 minutes (in theory).

The importance of using products with UV protection factor

1. Reduces the risk of skin cancer

According to the American Association of Dermatology, 1 in 5 people will develop skin cancer in your lifetime. Regular use of sunscreen can reduce the risk of melanoma by up to 50%.

2. Prevents premature ageing

UV rays degrade collagen and elastin, the proteins responsible for skin firmness and elasticity. Studies show that daily use of SPF reduces the risk of wrinkles and pigmentation spots by up to 24%.

3. Maintains collagen health

Sun protection helps prevent collagen degradation, helping to keep skin firm and youthful.

4. Prevents hyperpigmentation and sunspots

Exposure to the sun encourages pigmentation spots, which can be difficult to treat later. Using SPF reduces the risk of hyperpigmentation by up to 30%.

5. Protects against sunburn

Sunburn is not only painful, but can cause permanent skin damage and increase the risk of cancer.

How to use sunscreen correctly?

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How to apply sunscreen?

• Quantity: Use about 2mg/cm² of skin. For the face and neck, this is the equivalent of one tablespoon.
• Reapply: Reapply every 2 hours, especially after swimming or heavy sweating.
• Sensitive areas: Don't forget your ears, neck, hands and lips. Use a lip balm with SPF.

Types of sunscreen

1. Chemical SPF: They absorb UV rays, converting them into heat. Ideal for everyday use, but can irritate sensitive skin.
2. Mineral SPF: Contains zinc oxide or titanium dioxide, reflecting UV rays. The right choice for sensitive skin.

What SPF is recommended daily?

Dermatologists recommend use an SPF of at least 30 for daily use, even on cloudy days, as UV rays can penetrate through windows.

The best sunscreen products

1. Color Cream SPF 30: This is considered a minimum base for daily protection, providing adequate protection against UVB rays. It is recommended to use it daily, regardless of your activities, as it can reduce the risks of premature aging and skin cancer.
2. Fluid emulsion with SPF 50Ideal for people who spend a lot of time outdoors or for those with sensitive or sunburn prone skin. SPF 50 offers superior protection, almost blocking the sun's 98% from UVB rays.
3. Layer applicationTo ensure optimal protection, it is essential to apply the product with 30 minutes before sun exposure, allowing the active ingredients to absorb. Also be sure to reapply every 2 hours, especially after swimming or strenuous physical activity.
4. Products with combined protectionMany skincare products include SPF - look for moisturizers, foundations or BB creams that contain SPF,

Interesting facts about the impact of UV protection on skin

• Only 20% of adults use sunscreen daily.
• Plague 70% among users prefer chemical SPF for its lightweight formula and fast absorption.
• 80% from sun exposure occurs before the age of 18, emphasizing the importance of using SPF from childhood.

Tips for an effective routine

• Morning: Apply SPF after moisturizer, 30 minutes before sun exposure.
• Throughout the day: Reapply every 2 hours or after contact with water.
• Evening: Cleanse skin thoroughly to remove any remaining SPF.

Protecting your skin against UV rays is more than just a step in your skincare routine - it's an investment in your long-term health and beauty.

Choose reliable products and apply them correctly to prevent skin problems and maintain a radiant complexion.

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Sources and References

• American Academy of Dermatology (AAD) - Protect your skin from the sun
• Skin Cancer Foundation - The importance of sunscreen
• Mayo Clinic - Sunscreen: How to protect your skin
• Harvard Health Publishing - Sunscreen: What science says about its benefits
• Johns Hopkins Medicine - Sun exposure and skin damage