Many people ask which is better to use a separate sunscreen or get tools with built-in an SPF, which now is in the creams, powders, primers, day cream etc.
Postscript to the cosmetics of the built-in protection from UV light - empty words. And in all these SPF means it does not work the way it works in sanskrine. Now Let us examine why.
It is useful to know, because in the future when choosing cosmetics you filter out all the useless and unnecessary not overpay.
About I will not repeat the importance sanskrina it was chewed repeatedly sun kills youth, and it is time to remember that it is the strongest and the main enemy of our skin. Yes, the sun gives the tan will dry spots, provide vitamin D, which on-the-very important for weight loss, but at the same time, we quickly ultraviolet ages and are at high risk of melanoma formation.
Ultraviolet would get you everywhere, even in cloudy weather, your home or office through the window glass in the vehicle. It penetrates into the deeper layers of skin, the epidermis does not delay the ultraviolet rays. Those, in turn, gradually break down collagen and DNA of the cells change. Pigmentation and aging face - this is the most humble, what can hurt ultraviolet. Skin cancer - this is serious.
And is not serious to treat about SPF can only be a person who is either still do not know, or he simply does not care the.
And now look at three reasons why funds with an SPF, with the exception of traditional sanskrinov useless.
1. Weak SPF record
There are official recommendation from the American Academy of Dermatology, that protect the skin from ultraviolet radiation is required at least 30 SPF. Everything below, such means are useless for protection.
Let me remind you that we hear two spectra of ultraviolet rays:
- UVB: because of them we get a tan or burn, it is possible to protect them simple clothing and headgear;
- UVA: this is a serious and dangerous rays that pass through all of that may be, they greatly affect the photoaging. It is the action of these rays struggling SPF.
To combat UVA-rays requires three times more than the SPF, than UVB-rays. Example: sanskrin with SPF 30 protects against UBV all 30 and from UVA - like sanskrin with an SPF of 10 from the UBV-rays. We understand this point?
So that summer should be to protect the skin from the general factor of 50, not below. And I came across creams with SPF 15-20. Well, it is better to do it was not added, to be honest.
Exceptions - Korean-BB cream, SPF 50 comes there. However! It will also be useless tuning cream below the second reason is explained.
2. Weak concentration protective elements
In tone and a day cream with SPF-factor of the substances that protect against UV rays on the skin, it is composed of, at best, in the middle.
A traditional sanskrine is a large concentration of filters in structure, otherwise sanskrin just will not be properly protected from the sun. filters concentration in the composition is so high that there will be no space for the components calculated under the base for make-up or under hydration.
3. For normal sun protection foundation would have to put on the face very, very much
As manufacturers generally calculate how much SPF in their sunscreen? According to a special protocol (at the FDA can read hereIn question 10) per square centimeter of skin is necessary to apply 2 mg of drug. So calculate the amount of SPF and so need be applied to the skin.
And now attention! If you measure the length of the line of growth of hair to the chin, then the width of the cheekbones, and all this is multiplied. More multiply the 2-3, because we face - not a flat spatula, and three-dimensional. You will get a rough value of the area of our face, which will be smaller than it actually is. So, as a rule, face area greater than 500 square centimeters.
If you multiply by 2 mg, it turns out that the person have to do more grams of tonal resources, so that it protect the skin from ultraviolet radiation. Do you like imagine? Well this is an ugly thick! It is better to have at all then do not use concealer.
And add to this the fact that the SPF-filters that come as an addition to the facility, less conventional sanskrina.
Total
Sanskrin sanskrin there, only it properly protects us from ultraviolet radiation. Everything else - syllogism cosmetics manufacturer in order to attract interest in their products.
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