What is SPF?
SPF (Sun Protection Factor) is an index that shows how long your skin can stand the sunlight after applying sunscreen, compared to the time your skin is sunburned without using the product.
How to determine the appropriate SPF
Adequate sun protection is an important step to minimize skin damage caused by UV rays. Here are some ways to help choose products with an SPF that are suitable for your skin.
- Use a broad-spectrum sunscreen
Prioritize products with a minimum SPF of 30, which helps block about 97% of UVB rays and protect the skin 30 times more than when not using cream. The higher the SPF, the better its sun protection. If you are active outdoors, consider using SPF 50 to increase protection.
- Note the time of use and application
Apply enough sunscreen, about 2mg per cm2 of skin. Limit going out between 12pm and 4pm, when the UV rays are at their strongest. If you exercise a lot or go to the beach, you should choose waterproof and sweatproof sunscreen. At the same time, remember to apply it every 2 hours to maintain effective protection.
- Select SPF according to daily activities
A suitable SPF depends on your time and exposure to sunlight. SPF 15 can protect about 93% of UV rays, suitable for those who move gently or stay indoors a lot. SPF 30 - 50 is suitable for people who are often outdoors, have skin sensitive to the sun or live in areas with strong sunlight.
