Let's talk about this whitening ingredient that has become an internet celebrity - 377 (phenethyl resorcinol). I believe that everyone is no stranger to the ingredient phenethyl resorcinol. It can be said to be one of the most widely used and most effective raw materials among several resorcinol derivatives. Do not confuse it with hydroquinone (hydroquinone) and rhododendrol. Hydroquinone cannot be used in cosmetics in China.
The reason why phenethyl resorcinol has a good effect on improving skin color is that it has a bisphenol structure, such as the well-known hydroquinone, resveratrol, etc. Play a role in the competitive inhibition of tyrosinase, so gradually improve the skin tone.
Then, phenethyl resorcinol has a bisphenol structure, so it is also a strong antioxidant and has a good antioxidant effect. But the downside is that everyone knows that antioxidants sacrifice themselves to protect others, so if phenethyl resorcinol is not formulated with other antioxidants and color protectants, it will easily change color.
In short, the effect of phenethylresorcinol is valid both in vitro and in vivo. Although various raw material companies have used patch experiments to prove that they have hypoallergenicity and safety at high proportions. However, this ingredient that has such a good whitening effect is not so friendly. Because it has a problem when it is applied, which is the tingling sensation. In the application of phenethyl resorcinol in cosmetics, people with poor skin barrier often feel a tingling sensation in a short time, but it is not caused by allergies, it is purely irritation.
When it comes to tingling, we have to mention the way phenethyl resorcinol is dissolved in cosmetics.
The first is the polar oil-soluble oil with good penetration effect. This dissolution method allows phenethyl resorcinol to penetrate into the skin well and play its due role. But in order to relieve the tingling sensation when using, it is usually made into a thick oil cream;
The second is to dissolve with diols. The advantage of this dissolution method is to reduce the tingling sensation, but at the same time, it also reduces the permeability of phenethyl resorcinol, which is easy to precipitate on the skin surface, resulting in poor final effect.
Therefore, the phenethyl resorcinol products currently on the market are either thick emulsification systems or alcohol-soluble methods. Therefore, if it is added to the highest domestic standard of 0.5%, consumers must be mentally prepared to feel a short-term tingling sensation. For normal skin, 0.1%-0.3% basically reflects a weaker tingling sensation.
All in all, if you want to buy phenethyl resorcinol products, it is best to have a certain amount of mental preparation, especially for people with poor skin barrier, so just like using cosmetics containing A-alcohol, slowly build up. Be patient.
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Product Info - Phenylethyl Resorcinol
Certificate of Analysis - Phenylethyl Resorcinol
Phenylethyl Resorcinol - New Favorite in the Whitening Industry
