This is an automatically translated article.
Sunscreen is an indispensable product in the summer to fight the harsh sun. However, many women still wonder, do not know how much SPF cream to choose and bring the best effect. Does a sunscreen with a higher SPF number work better against the harmful effects of UV rays in the sun? And what is the highest SPF sunscreen available today?1. Harmful effects of UV rays in the sun
UV rays - ultraviolet rays found in sunlight, with high radiation ability when shining down to the earth's surface. Usually UV rays have only a slight impact, but when exposed to the sun for too long, it will lead to dangerous damage.
UV rays are classified into 3 types: UVA, UVB, and UVC. UVC rays are trapped in the ozone layer so it shouldn't cause too much concern.
UVA rays are ultraviolet rays with wavelength A, because they have a longer wavelength than UVB rays, they penetrate deeper into the skin, causing the skin to wrinkle, darken and appear melasma, if exposed for a long time and more health will be affected.
UVB rays are ultraviolet B wavelengths, this is the main cause of skin burns, burning red... over time, skin cancer cells will form. UVB rays make up 1-5% of UV rays.
Tia UVA và tia UVB khiến da bạn bị tổn thương
2. What is the SPF in sunscreen?
According to the US Food and Drug Administration (FDA), SPF is a measure of the level of protection against UVB rays used in cosmetics. This norm is calculated as a percentage and number of hours when sunscreen is applied to the skin.Currently the lowest sunscreen index is 15%.
According to international standards, 1 SPF has the ability to protect the skin and limit the effects of UVB rays for about 10 minutes.
Usually the SPF will be understood in two common ways:
Measure over time: the SPF number is multiplied by 10 to calculate the number of minutes that the sunscreen is effective. Percentage measurement: for example, a sunscreen with an SPF of 30, when placed in perfect conditions, will block 96.7% of harmful effects from UVB rays....this result is only achieved for a period of time. certain time. In fact, no sunscreen product promises to block 100% of the harmful effects of UVB rays.
3. What is the highest SPF of sunscreen? Should I use a sunscreen with an SPF that is too high?
Kem chống nắng có chỉ số cao nhất là bao nhiêu?
Currently, sunscreen with the highest SPF index is 100.
In fact, when you use sunscreen with the highest index, it is only slightly better than SPF 30.
Sunscreen Good sunshine should have the right ratio of UVA to UVB protection. This ratio is 1: 1⁄3.
Sunscreens with a high SPF usually have a higher protection factor for UVB rays than for UVA rays. Therefore, you think that the taller you are, the better, but no, your skin is not fully protected.
Should use sunscreen with natural ingredients is definitely better than creams containing chemical ingredients and synthetic substances.
Sunscreens with high SPF (over 60) should only be used on special skin areas such as treating melasma or sun allergies.
4. How much SPF is the best sunscreen?
Choosing the right sunscreen is very important. If you choose the wrong one, not only will it not have a good sun protection effect, but it will also cause your skin to be allergic and damaged.Do not choose a sunscreen with a high SPF because that will often focus on UVB rays rather than UVA rays. The higher the SPF, the longer the amount of cream will stay on your skin, causing your skin to clog pores and be damaged, making your skin age faster.
Choose a sunscreen with a reasonable SPF that does not make your skin dry and irritated.
According to dermatologists, the best SPF sunscreen has an SPF of 30 to 60.
Using a sunscreen with an SPF of less than 30 won't do any good for your skin. .
For acne-prone skin, you should use a sunscreen with an SPF of 15-30 to avoid irritation.
Sunscreen is an important product for women - inseparable objects. This is an important weapon to protect the beauty of any girl when going out on the street. To best protect your skin from environmental damage, you need to understand and know how to choose and use sunscreen.
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