377 at first thought it was a password, but after research, it was verified that it was a "whitening code"! 377, also known as phenylhexyl resorcinol, is currently one of the most widely used and most effective raw materials in several phenol derivatives, but do not confuse it with phenol (hydroquinone) and rhododendron spring, because in the domestic hydroquinone can not be used in cosmetics.
<h1 class="pgc-h-arrow-right" data-track="5" > [377 positive solution].</h1>
377 full name is phenethyl resorcinol, raw materials from Dezhixin SymWhite377 Xin skin white, belongs to resorcinol derivatives, the ideal PH value between 4-5, it can improve uneven skin tone, reduce ultraviolet irradiation of skin caused by melanin precipitation. It is also a strong antioxidant, playing a good antioxidant effect, but this whitening effect so good ingredient is not very friendly to the skin, there will be a problem when applying, that is, tingling, people with poor skin barrier will have a tingling sensation in a short period of time, but it will not cause allergies, just a simple sense of irritation.
377 whitening
Speaking of tingling, I have to say that the dissolution method of phenyl ethyl resorcinol, one is polar oil soluble, made into a thick oil cream, mixed oil, oil skin may not be able to hold. The second is glycol dissolution, which has the advantage of reducing the tingling sensation, but the permeability is poor and may float on the surface of the skin. This may be the reason why fish and bear paws can't have both, if you want to whiten, you have to endure the tingling sensation and slowly build up the tolerance of the skin.
<h1 class="pgc-h-arrow-right" data-track="5" > [what is the tolerance concentration of 377].</h1>
In China, the regulations stipulate that the limit of 377 is 0.5%, but some international big names have concentrations as high as 1.8%, and such a high solubility cannot be produced in China, so how high the concentration of 377 needs?
The highest domestic addition standard is 0.5%, but to be mentally prepared, there may be a tingling sensation in a short period of time, because the tingling sensation felt between 0.1% and 0.3% of normal skin is weak, usually in cosmetics The recommended dosage is 0.1-0.5%, and when the amount of addition reaches 0.1%, it can already play a role.
<h1 class="pgc-h-arrow-right" data-track="5" > [377 whitening principle].</h1>
377 is one of the most active inhibitors of tyrosinase, 22 times that of kojic acid, can effectively inhibit the activity of B16V cells to synthesize melanin, is 210 times that of kojic acid, he can improve uneven skin tone, reduce skin coloration caused by ultraviolet radiation on the skin.
<h1 class="pgc-h-arrow-right" data-track="5" > [377 Use contraindications].</h1>
377 has a certain irritation, it is recommended to use sensitive muscles with caution. 377 is also very easy to be oxidized, so it is best to choose vacuum packaging when choosing 377 products, if not, choose disposable packaging. After opening, it should be used within two months and stored in the dark.
377 should be used at night before going to bed, because it contains vitamin C, has a whitening effect, to avoid light, after using at night, during the day should also do a good job of sun protection, otherwise the skin will be easy to tan. Use 377 after cleansing and toner, and each dose is about the size of a soybean.
Finally, whitening products are not recommended to be used in stacking, otherwise they will be self-defeating or either rubbing mud or stimulating. In addition, when choosing 377 cosmetics, be sure to pay attention to the concentration, match the products that suit you, gradually increase the amount when using, establish tolerance, reduce the skin to withstand too much irritation, especially the sensitive skin of the small partners, must pay attention!
<h1 class="pgc-h-arrow-right" data-track="5" > [377 comparison with niacinamide, arbutin, and VC whitening].</h1>
The ability of 377 to inhibit the activity of parazimine is the strongest among current whitening agents, 22 times that of kojic acid, and 100 times that of β-arbutin. Moreover, it has an antioxidant effect, which is one of the few whitening agents that has the dual ability of antioxidant + inhibition of complexase activity. However, there are also disadvantages, such as instability in the sun, greater stimulation, etc.
Niacinamide should be the most popular whitening ingredient at present. In addition to whitening, it also has multiple effects such as oil control, anti-inflammatory, anti-aging, antioxidant and so on. When the niacinamide content is 4%, it can be effective in whitening and anti-inflammatory. However, because niacinamide can control oil, use dry skin with caution, and strengthen moisturizing after use. And niacinamide also has a disadvantage, that is, it can not be immediately effective, and it needs to be used for a long time to see the effect.
Arbutin is a derivative of hydroquinone, the king of whitening. It is divided into α-arbutin and β-arbutin. It is generally recommended to choose α-arbutin, which has strong stability and inhibits the activity of complexine enzymes. The advantage is that it is suitable for any skin type, but the concentration needs to be controlled, and when the concentration is greater than 7% fit, white spots may be produced.
VC, also known as vitamin C, is primarily antioxidant. VC and VC derivatives are suitable for all skin types, and on the basis of the prescribed upper limit of 20%, the higher the concentration, the better the effect, but the greater the irritation.
In fact, whitening products have their own advantages and disadvantages, when choosing to see their skin tolerance, whitening is a gradual process, can not be too eager to achieve, otherwise it may destroy the skin barrier, made into sensitive skin, whitening and sensitivity is a headache.