The weather is hot, and there are many kinds of sunscreen. What sunscreen is better?

To protect the skin, the most basic principle is not to expose the skin directly to the sun, and to use sunscreen products suitable for the skin and parts, plus appropriate sunscreen measures, such as hats, umbrellas, long-sleeved coats, etc. , can effectively block the damage of ultraviolet rays. In addition, when purchasing sunscreen products, we should also consider the waterproofness of sunscreen products, the sunlight intensity in the use situation and environment. When you are active in open areas such as mountains or seaside, because the reflection is stronger than other places, you need to use sunscreen products with high sunscreen value to block ultraviolet rays, otherwise you will often be attacked by ultraviolet rays unconsciously.

First, how to choose sunscreen

1. It is recommended to have an accurate skin test before buying sunscreen. Oily skin should choose water-based sunscreen products with strong penetration; Dry skin should choose cream-like sunscreen products; Generally, there are no strict rules for neutral skin, and lotion sunscreen is suitable for all skin types.

2. calculate SPF value. Generally speaking, the higher the SPF index, the greater the protection. Generally speaking, it is more suitable for people with ordinary skin color to use SPF8 to 12; Those with fair skin are advised to choose SPF30 sunscreen; For people who are allergic to light, the SPF value should be between 12 and 20.

3. Understand the applicable population of different sunscreens. Different sunscreen products have different application targets. The best way is to try it on the inside of your wrist before buying it. If the skin becomes red, swollen, painful and itchy within 10 minutes, you have an allergic reaction to this product. You can try a product with a lower SPF than this one. If there is still a reaction, it is best to give up the brand's sunscreen.

Two: See through SPF.

SPF value: It is the main content marked on every bottle of sunscreen. The true meaning of SPF value seems too formal to understand. Scientific SPF refers to the ratio of the energy required to produce the minimum erythema on the skin protected by sunscreen to the energy required to produce the same degree of erythema on the skin without any protection. Simply put, it is the time multiple of skin's resistance to ultraviolet rays.

For the yellow race, it is calculated as follows: generally, the skin of the yellow race can resist sunlight 15 minutes without being sunburned, so using SPF 15 anti-ultraviolet products will have a sunscreen time of about 225 minutes. Objectively speaking, the level of sun protection index reflects the ultraviolet protection ability of sun protection products. The higher the SPF index, the greater the protection, but the increase of SPF value is not proportional to the ability to shield ultraviolet rays.

Generally speaking, products with the lowest SPF 2 ~ 6, medium SPF2~6 ~ 8, high SPF6~8 ~ 12 and SPF value of 12 ~ 20 are high-intensity sunscreen products, and products with SPF value of 20 ~ 30 are ultra-high-intensity sunscreen products. However, there are many people who like to bask in the sun abroad, so the index of sunscreen products designed is relatively high, and some even reach SPF80.

Three: See through the sun protection index PA

It has been scientifically confirmed that UVA- 1 is the killer of skin aging, so Japanese scientists have developed a sunscreen that specifically resists UVA- 1 and used "+"to indicate the defense strength. The correct statement of PA is to protect UVA- 1, and its degree is marked with+,++and++. The more "+",the better the anti-UVA effect.

If you carefully observe the sunscreen products on the market now, you will find that many sunscreens not only have SPF value, but also have clearly marked PA value. Because SPF is aimed at UVB ultraviolet rays, that is to say, it can only defend the total amount of ultraviolet rays on the ground 1%, but it can't do anything about the real sunshine killer UVA. Therefore, sunscreen products for UVA will play a more effective role. Products marked with PA have such a function, which can reach the bottom of dermis in the shortest time and prevent ultraviolet rays from damaging elastic fibers and causing skin aging.

Usually, the strength of PA is represented by+,and one more+means that the effective protection time is prolonged. Specifically:

The effective protection time of PA+ is about 4 hours.

The effective protection time of pa++ is about 8 hours.

Pa+++ super protection.

Four: How to choose the appropriate SPF value?

1. For people with normal skin, the SPF value should be 8 ~12;

2. For people who are sensitive to light, the SPF value is12-20;

3. Sensitive skin should choose sunscreen formulated by plants or physical sunscreen containing titanium dioxide.

4. For office workers who only bask in the sun on their way to and from work, the SPF value can be below 15, mainly for face sun protection;

5. When playing in the wild and swimming by the sea, the SPF value of sunscreen products should be above 30. It is best to choose waterproof and sunscreen skin care products when swimming.

Select the PA value of sunscreen products.

It is not enough to look at SPF value for sun protection today. Because SPF can only defend against U-VB ultraviolet rays, that is to say, it can only defend against 1% ultraviolet rays. The real sunshine killer is U-VA, which accounts for 98% of ultraviolet rays on the ground. UVA is the most lethal, because it can reach the bottom of dermis in the shortest time, quickly damage elastic fibers and cause skin aging. The only way to deal with UVA is to choose "PA+" products to prevent UVA. Because of the reflection of the sun's light, the skin in water will absorb twice the ultraviolet rays. So you should not only choose SPF30 or above, but also choose PA+++ sunscreen, and it is best to choose sunscreen milk instead of sunscreen.

How to identify PA value

The effective protection time of PA+ is about 4 hours. The effective protection time of PA++ is about 8 hours. PA+++ super protection. Also remind you, don't buy sunscreen products cheaply. Because the cost of sunscreen raw materials is relatively high, it is impossible for cheaper sunscreen products sold in small commodity markets to contain sunscreen ingredients. It is more reliable to go to a reputable shopping mall.

Five, other sun protection equipment

Sunglasses: Sunscreen sunglasses must choose lenses with high sunscreen effect, so as to protect the eyes from injury.

Sunshade: UV umbrella is a necessary sunscreen for ladies in summer. And different umbrellas also have different sun protection indexes.

Colored T-shirts: T-shirts are a must-have item in everyone's closet. Colored T-shirts are a good helper for sun protection. It can absorb ultraviolet rays from outside.

Scarf: There are many short-sleeved clothes in summer, so it is best to wear a scarf when going out. Let the sunshine be impeccable.

Hats: hats are a must-have item for many fashionable MM in summer, and the big brim can help you resist ultraviolet rays.

For more skin problems, please ask questions on Zhiwo cosmeceutical skin expert platform or consult online in Zhiwo cosmeceutical official website.