Sunscreens come in many forms: spray, gel, patch or topical… but generally contain physical or chemical ingredients that are able to block, absorb or spread some UV radiation on the area. skin exposed to the sun. The 3 types of UV filters that can be combined in sunscreen products are: Organic chemical compounds that can absorb harmful components of UV light (oxybenzone, sulisobenzone, avobenzone). Inorganic particles reflect, scatter and absorb UV light (titanium dioxide, zinc oxide, superoxide dismutase, phlebodium aureum). Organic particles that can reflect, scatter or absorb light (tinosorb M, tinosorb S, mexoryl XL.). The American Cancer Society recommends that people use sunscreen because it can help prevent squamous cell and basal cell skin cancers, and to use broad-spectrum sunscreens because they can provide Protects against both UVA and UVB rays. What is SPF sun protection factor? SPF (Sun Protection Factor) is a measure of the amount of UV radiation needed to create a sunburn on the skin. All sunscreens are tested to measure the amount of UV radiation exposure needed to cause sunburn when sunscreen is used compared with UV exposure to cause sunburn without sunscreen. Sunscreen. The product is then labeled with the appropriate SPF value. The SPF value indicates the level of sunburn protection provided by the sunscreen product. As the SPF value increases, the level of sunburn protection increases. Sunscreen is only effective when applied to the skin about 15 – 30 minutes before going out in the sun. Should choose sunscreen products with medium SPF, in the city only need to use products with SPF 20 – 30. A very common misconception is that consumers are often told that an SPF 15 sunscreen can provide 15 x 10 minutes = 150 minutes of sun protection without sunburn. This is not true because SPF is not directly related to the time of sun exposure but to the amount of energy exposed to solar radiation. Although the amount of solar energy is related to the length of exposure to the sun, there are other factors such as the intensity of the solar energy that can affect the amount of UV radiation. For example, the following exposures could result in the same amount of solar energy (because the sun is more intense at noon than at other times): Example 60 minutes of solar energy at 9 morning hours can be equivalent to 15 minutes at 13 pm. The intensity of UV radiation in sunlight is also related to geographical location, greater radiation intensity occurs at lower latitudes. Several other factors can affect the amount of solar radiation exposure bức – People with fair skin are able to absorb more solar energy than people with dark skin under the same conditions. – The more sunscreen used, the less solar energy is absorbed. Sunscreen wears out and becomes less effective over time so frequency of reapplying is important to limit absorption of solar radiation. The frequency of reuse is also affected by the activities the user engages in. For example, when swimming, sunscreen needs to be reapplied more often because water can wash sunscreen from the body. In addition, high levels of physical activity also necessitate more frequent use of the cream because this activity can cause heavy sweating that washes away the sunscreen. Because many different factors affect the amount of solar radiation, the SPF number does not reflect the length of time a user is in the sun. In other words, SPF doesn’t inform users about how long they can stay in the sun without getting sunburned. Instead, SPF is a relative measure of the amount of sunburn protection provided in a sunscreen. Different sunscreens will have different SPF ratings. There are sunscreens with SPFs between 15 and 100 on the market today, allowing consumers to compare levels of sunburn protection. The higher the SPF, the more protection your skin can get from the sun. But 3 times the SPF does not mean 3 times the UV protection. For example, SPF 20 sunscreen can absorb up to 95% of UV rays, while SPF 60 sunscreen can absorb up to 98.3% of UV rays; SPF 15 blocks 93% of UV rays; SPF 30 blocks 97% of UV rays; SPF 50 blocks 98% of UV rays. In Vietnam, you should choose a sunscreen with an average SPF, in the city you only need to use a product with an SPF of 20 – 30, when you go to the beach, you need to use a sunscreen with an SPF of 50+. In fact, the majority sun protection index is often not as advertised. Some surveys show that over 40% of sunscreen products with SPF sun protection do not reach the level stated by the manufacturer on the product.

Because of the variety of sunscreens, not everyone knows how to choose the right product for their skin. According to The Healthy, based on skin type is the most effective way to choose sunscreen. Photo: Stylecraze. 1. Normal skin: Both physical and chemical sunscreens can be used on normal skin. Dermatologist Tsippora Shainhouse in Beverly Hills (USA) recommends that users choose products with broad-spectrum protection, which can block both UVA and UVB rays. “If you’re just indoors, SPF 15 should suffice. You’ll need SPF 30+ or ​​higher if you have to go out,” she says. Image: The Independent. 2. Oily skin: People with oily skin need to be especially careful when choosing a sunscreen because this product easily makes the skin greasy. Shainhouse suggests that users should choose a gel-based, alcohol-based chemical sunscreen or a mild moisturizer for best results. In addition, the ensulizole component should also be noted because it is the least greasy. Image: Evening standard. 3. Dry skin: “People with dry skin should use a daily moisturizer that contains sunscreen,” says Joyce Imahiyerobo-Ip, director of cosmetic dermatology at South Shore Medical Center in Massachusetts. In case you are still unsure, you can mix a thick moisturizer with sunscreen before applying it to your face and body. Image: Verywell Health. 4. Combination skin: Like many other cosmetics, sunscreens for combination skin need to be light in texture in the form of gels, essences, or sprays to avoid clogging. Besides, you should also avoid ingredients that soften the skin such as plant oils, fatty acids if you do not want the skin to be more greasy. Image: The Independent. 5. Acne skin: Sunscreens for acne-prone skin often have “Non-Comedogneic” written on the label. Some chemical sunscreens containing derivatives, oxybenzone, fragrance, alcohol are also not suitable for acne skin. Image: Dermstore . 6. Sensitive skin: Similar to acne skin, sensitive and easily irritated skin needs more care in choosing products. Besides some basic criteria such as alcohol or fragrance-free and nourishing ingredients, products tested by doctors or experts are the wisest choice. Image: Pinterest .

Besides, mineral spray is also a good habit for the skin when the weather is hot. You need to use it correctly for the product to work. How to wash off sunscreen? Conventional sunscreens can be removed with a facial cleanser. However, with products labeled waterproof, sweat-proof or water-resistant, it is necessary to use makeup remover. Use makeup remover to remove sunscreen. Photo: Korean Beauty. Currently, most products contain sunscreen ingredients in solid form, insoluble in water. Therefore, ordinary face wash cannot clean it all. If not cleaned, sunscreen is left on the skin, causing clogged pores and acne. Therefore, it is necessary to use makeup remover to remove sunscreen. Classification of sunscreens Sunscreens can be divided into two categories, physical and chemical. Those with sensitive or extremely dry skin should refer to physical sunscreens. Physical sunscreens have the ability to reflect UV rays, preventing skin tanning. It is like a protective barrier on the skin. Meanwhile, chemical sunscreens have the ability to absorb UV rays and reduce sun damage to the skin. The biggest advantage is the thin and light structure. Time to apply sunscreen Normally, you should reapply sunscreen every 3-4 hours. In addition, the duration may vary depending on the type of cream. Products with SPF 15 and PA+ should be reapplied every 4-5 hours. You should reapply sunscreen during the day. Depending on the product, the time period will vary. Photo: Cosmopolitan. Meanwhile, sunscreen for outdoor sports people should be reapplied every 3-4 hours. The cream used for swimming will be reapplied every 4-5 hours. When should mineral spray? You should use mineral spray after washing your face. Besides, it can aid in cleansing as the first step of a skincare routine. Mineral spray will be the last step of the skin care process before going out on the street. When we are exposed to the outside environment, mineral spray helps to increase moisture, reduce skin dehydration. During the day, you can spray when your skin feels dry. However, it should be noted to use oil blotting paper to remove excess oil on the skin. The effect of mineral spray is quite obvious. First of all, it helps the skin replenish moisture. Besides, people with dry skin should carry a bottle with them to improve skin moisture. 9 easy places to forget when applying sunscreen Some small skin areas such as the earlobes, between the fingers… are often not noticed by people when applying sunscreen.

1. Using insufficient dosage: Applying too little sunscreen prevents the skin from receiving optimal protection from UV rays. Dermatologist in Okemos (Michigan, USA) explains on Real Simple : “With products with SPF 15, if not applied enough, the sun protection effect will be equivalent to products with SPF 8”. The amount of sunscreen the size of the palm of your hand is enough for the body. On your face, you should apply sunscreen that is the size of a dime. Image: Carilion Living. 2. Do not reapply sunscreen: Sunscreens of any kind, including water-resistant ones, degrade after 2 hours of use in the sun. If you swim or sweat a lot, the above time will be shorter. When reapplying sunscreen, you can use makeup remover to remove the previous layer. In case makeup must be maintained, reapply with a powder sunscreen. Image: Lanxel. 3. Just look at the SPF number: SPF (Sun Protective Factor) is an index that protects the skin from UVB rays (which cause sunburn). Meanwhile, UVA rays from sunlight also bring many harmful effects. Carrying a longer wavelength than UVB rays, UVA rays penetrate deeper into the skin, destroying collagen structures and leading to skin aging. Use a broad-spectrum sunscreen that says “broad-spectrum” on the packaging. For sunscreens that use the PA character, choose a product that has the PA character with plus signs after +++ or more. Image: Chophealth. 4. Failure to follow the instructions for use on the packaging: Chemical sunscreen ingredients take a while to activate their ability to absorb UV rays. When using chemical sunscreen, you need to apply it about 20 minutes before going out in the sun. This information is noted on the packaging in the instructions for use. In contrast, 2 physical sunscreen ingredients – titanium oxide and zinc oxide – will act immediately upon application. With a physical sunscreen, you don’t have to wait for the sunscreen ingredients inside to take effect. Image: Byrdie. 5. People with brown skin do not need to apply sunscreen: Dermatologist Jeanine Downie of Montclair (New Jersey, USA) said: “Dark skinned people often have a natural SPF of 5 to 8. That excess melanin can minimize the risk of burning caused by However, they are not enough to protect the skin from UVA rays – the leading cause of aging, skin cancer.” Image: Allure. 6. Apply sunscreen only to the face: Your ears, lips, and nape also need to be protected with sunscreen. As for lips, you can use lip balm containing SPF over 30. Photo: Allure. 7. Relying on Sunscreen Only: Sunscreen plays an important role in protecting the skin from UV rays. However, it’s not the only thing. When out in the sun, you should wear long, dark clothes. Outfits made of dark fabrics with tight seams provide extra sun protection. Image: The Skin Cancer Foundation. 8. Using sunscreen for too long: In unopened condition, sunscreen usually has a shelf life of about 2-3 years. If opened, this period is reduced to 6 months. Do not apply sunscreen that has expired, has changed in texture, color or scent. Image: Business Standard. 5 habits that make your skin age faster Some daily actions cause wrinkles to appear on the face soon.

Expensive cleansers: Cleansers only come into contact with the skin for a short period of time, so they don’t have much of an impact on the skin other than removing makeup, sebum, and dirt – something every cleanser does. can do it. Instead of spending money on expensive cleansers, you should buy yourself a face wash or scrub.

Popular anti-aging products: Snake venom or stem cells sound “luxurious,” and they do indeed have a number of benefits for the skin. However, there are no scientific studies to prove the retinol and AHA content in these two products.

Expensive sunscreens: You could argue that expensive sunscreens have a more pleasant scent and don’t cause greasy or squishy skin. However, in terms of sun protection effects, more expensive sunscreens do not mean that they are better protective of the skin.

Fat-soluble creams: Sagging skin, fatty orange peels are the result of a complex biological process that up to now no product can prevent or repair. Melting cream can only make sagging skin look smoother.

Stretch marks treatment cream: If stretch marks treatment cream is really effective, no one will have stretch marks anymore! Instead of spending money on stretch marks, consider more effective methods such as laser treatments, or covering up stretch marks with makeup.

Pore ​​Tightening Products: It’s best not to believe the promises made about products that will help tighten pores. For example, manufacturers should only promise that they can make pores less obvious by filling them with products containing silicon.

Salon hair care products: Hair care products at hair salons don’t actually use any special technology to make them better than conventional products. In fact, these products also contain the same basic ingredients as popular products.

Sunscreen has a high SPF: Many people mistakenly think that SPF 100 sunscreen is two times more effective at blocking UV rays than SPF 50 sunscreens. In fact, SPF 15 helps to block 93% of UV rays, SPF 30 SPF 50 for 97%, and SPF 100 for 99%. The biggest difference is that a sunscreen with a higher SPF will last for a longer time.

Products to remove skin blemishes: Products that promise to help you remove tattoos can only actually fade them. For skin imperfections such as tattoos or excess milia, it is best to see a dermatologist for advice on the most effective method to remove.