SPF, PA, UVA, UVB

do you know what is the difference of the four?

From some skin care reading, i found out that

SPF is to "counter" UVB and PA is to "counter" UVA.

So what is the difference between UVA and UVB?

UVA ranges from 400 to 320 nm, UVB from 320 to 290 nm

UVA is the main causes of skin aging, wrinkles, and "breaking" the collagen in our skin.

UVB is responsible for causing sunburn in your skin, making you dark, as well as skin cancer.

This tell you that even if you like to be tan and not white/fair, you still need sunscreen to prevent pre-mature aging, or even to slow down the aging process.

SPF is use to block UVB, the higher the SPF the better. Let say in general, a person will take about 10mins to get burnt(in terms of red skin) under the sun, using a SPF30 will slow the action by 30 x 10 = 300 mins, and a SPF50 will be 50 x 10 = 500mins.

PA is use to block UVA, PA usually comes in PA+ PA++ PA+++. In some europe products, PA is replace by IPD with stars replacing +. Of course, the higher the +, the better.

So all ladies, it does not mean only people like me (who wants to be fair) need sunscreen. With the broken ozone layer, i would say that the sunscreen is for everyone (men, women) in considering the possible of skin cancer.

My suggestion to to use a stronger SPF, at least 40 on your face, and SPF at least 30 on your hands and legs. Of course before you leave the house. By the way, if you put a SPF 30 sunscreen follow by a SPF 20 foundation, you don't get SPF 50 k.
the formula should be max(all the SPF on skin). so only SPF 30.

anyway, hime-sama is using this



i would recommend this as a good and cheap sunscreen for the face. Other sunscreen that i know is good is abit too ex for me in terms of long use.

Don't ask me about effect, coz i'm young so i can't see the diff yet. if 10 years later my skin still good, then i can tell you it is great. but anyway, prevention is better than cure.