Preface:
We've all heard the saying "no matter what the weather conditions outside, you must wear sunscreen every time you go out." Yes, not wearing sunscreen can negatively affect the skin, but how much sunscreen should you wear, how much sunscreen should you use, and what is the best sunscreen for my skin type?
With these questions in mind, here are 10 interesting facts you should know before using sunscreen.
Directory:
- Fact 1: What is UV radiation?
- Fact 2: What is SPF?
- Fact 3: Do dark skin have to wear sunscreen?
- Fact 4: What is the difference between physical and chemical sunscreen?
- Fact 5: How long does it take for my skin to get sunburned without sunscreen?
- Fact 6: How much sunscreen should I wear?
- Fact 7: How should I apply sunscreen?
- Fact 8: Can my foundation with SPF be used for sun protection?
- Fact 9: Does sunscreen deprive me of vitamin D?
- Fact 10: I recommend the best sunscreen for different skin types
- conclusion
Fact 1: What is UV radiation?
Usually on sunny days, both UVA and UVB light will reach the earth (ultraviolet rays are divided into UVB and UVA. UVA band, wavelength 320~400nm, also known as long-wave black spot effect ultraviolet. UVB (English full name: ultraviolet radiation b) is a band divided into ultraviolet wavelengths according to different biological effects, UVB is outdoor ultraviolet rays, people directly into the skin when they are outdoors). UVA is known to be the dominant factor, but UVB is the main cause of skin cancer, sunburn, and hyperpigmentation because it acts on the epidermis layer of the skin and destroys the skin's DNA. UVB typically peaks between 10 a.m. and 4 p.m.
UVA, on the other hand, appears year-round. Even if you're sitting in the room, it will "slip" in through the glass. It is the main cause of sagging and wrinkled skin because it penetrates deep into the skin and destroys collagen and elastin fibers.
That's why broad-spectrum sunscreen is recommended. It is protected against UVA and UVB rays!
Fact 2: What is SPF?
To understand how sunscreen works, we must know what SPF means. SPF (sun protection factor) is a performance indicator of sunscreen cosmetics to protect the skin and avoid sun erythema. You must have come across a lot of sunscreens with SPF 4, 15, 30, 50, etc. with a factor. The coefficient after the SPF value refers to the time frame within which ultraviolet radiation does not harm the skin!
- SPF 4 – 50% protection
- SPF 8 – 88% protection
- SPF 15 – 94% protection
- SPF 30 – 97% protection
- SPF 50 – 98% protection
Note: No amount of SPF can provide 100% protection
Fact 3: Do dark skin have to wear sunscreen?
The answer is yes, as everyone's skin is adversely affected to varying degrees from excessive exposure to the sun. However, some skin types are more vulnerable than others. Therefore, you need to check your Fitzpatrick scale to know what type of skin you have. The skin types on the Fitzpatrick scale illustrate which skin tones may and may not sunburn.
Fact 4: What is the difference between physical and chemical sunscreen?
- Physical sunscreen
Physical sunscreens, also known as barrier sunscreens, scatter ultraviolet, visible, infrared, and are mostly recommended for use in strong sunlight. They are generally ideal for sensitive and acne-prone skin types because they hardly irritate the skin. You will find titanium dioxide, zinc oxide, iron oxide and other ingredients in this type of sunscreen.
Physical sunscreen is located on the surface of the skin and is not absorbed by the skin, so physical sunscreen is applied thickly, so it may easily cause acne. Physical sunscreens are also harder to apply and tend to leave a white film on the skin.
- Chemical sunscreen
Chemical sunscreens absorb ultraviolet radiation and enter the skin, where they are then released in the form of heat. Most often, you'll find chemical sunscreens mixed with other physical sunscreen ingredients to enhance their efficacy. Because chemical sunscreens are absorbed by the skin, they may disrupt hormone levels and can be found in the urine.
Ideal for use as a primer because chemical sunscreens are absorbed, they blend well into the skin without leaving a white film on the skin. The downside is that it destroys hormones and is not a great option for children under 2 years of age.
Fact 5: How long does it take for my skin to get sunburned without sunscreen?
This answer depends on your skin type and the UV index on the Fitzpatrick scale. The UV index ranges from 0 -11, with 0 indicating low and 11+ indicating high.
Fact 6: How much sunscreen should I wear?
If you look at the instructions on most sunscreens, they basically say "free to apply", and you will have a question "how much free application means?" ”。
A simple way to ensure an appropriate dose of sunscreen is applied evenly to exposed areas, called the "teaspoon rule," which involves applying about 1 teaspoon (5mL) of sunscreen to the face and neck, 2 teaspoons on the front and back of the torso, 1 teaspoon on each of the upper extremities, and 2 teaspoons on each of the lower extremities.
Fact 7: How should I apply sunscreen?
If you're using skincare products like cleansers, toners, serums, moisturizers, etc., make sure applying sunscreen is the last step in your skincare routine. This will ensure that you don't undermine the effectiveness of your sunscreen. If you're using chemical sunscreen, apply it 20 minutes before heading out and reapply after swimming.
Fact 8: Can my foundation with SPF be used for sun protection?
A foundation that contains SPF is also not enough to protect you from skin damage caused by sun exposure.
Fact 9: Does sunscreen deprive me of vitamin D?
Sunscreen doesn't provide 100% sun protection, so the trace amounts of UVB that sunscreen can't shield are enough to synthesize vitamin D. But it depends on your skin type, UV index, weather, and age. Therefore, I highly recommend that you take a vitamin D supplement instead of relying solely on sunlight.
Fact 10: I recommend the best sunscreen for different skin types
- Prone to acne/oily skin
For acne-prone or oily skin, you really want to avoid products containing oxybenzone because oxybenzone has been shown to cause skin allergies, and since it can penetrate the skin, it causes sebum oxidation, which can lead to more acne.
For acne-prone skin, choose a sunscreen that contains a lot of zinc oxide and antioxidants. Zinc oxide is known to have healing and soothing properties that help reduce redness.
- Sensitive skin
For sensitive skin types, you can choose a sunscreen that contains physical and chemical components or a sunscreen that contains only physical components. It is recommended to choose a sunscreen rich in antioxidants.
- Dry skin
You can use a chemical or physical sunscreen that contains moisturizing ingredients. Choose a sunscreen that is truly gentle, gentle, and doesn't irritate the skin.
conclusion
Wearing sunscreen protects us from the sun's rays, and sunscreen is done all year round. Even on rainy or cloudy days, UVA can still penetrate the skin. I hope this article can be helpful to the old irons, welcome to leave a message in the comment area to express your opinion. (I like the old iron a little attention, thank you very much)