Why should alcohol A be used in the dark?
Alcohol A will exfoliate and be more vulnerable to ultraviolet rays; So avoid the light.
Skin care products need to be used away from light for different reasons, but there are two main reasons-the ingredients in skin care products will undergo photosensitive reaction; Active ingredients in skin care products are easily oxidized and decomposed when exposed to light.
phototonus
Photosensitive reaction refers to that some components will absorb energy of corresponding wavelength under sunlight, and destroy human tissues in the process of releasing energy, resulting in itching, erythema, edema and other symptoms of the skin, and may even cause blisters in severe cases.
In a word, the damage of photosensitive reaction to skin is much more serious than the direct exposure of solar ultraviolet rays. Fortunately, there are not many photosensitive reactions in many skin care ingredients. Let's start with the familiar vitamin A.
Vitamin A alcohol is also called retinol. Although it has no photosensitivity, its stability is poor, and it will lose its biological activity when exposed to heat, water, ultraviolet rays and even air ... peroxide.
When vitamin A alcohol is coated on the skin, it will be converted into vitamin A aldehyde and then into retinoic acid, which is photosensitive.
Precautions for using alcohol
1, establish tolerance
Step-by-step method-first local test, and then gradually expand to the whole face; Start using half a dose after moisturizing cream, and use it the next day or the next night. After two weeks, you can slowly increase the dose and use it every other day or every day. Alcohol A is a powerful drug, but it takes more than two or three months, so don't worry.
2, combined with other ingredients
(1) Nicotinamide: Alcohol A thins the epidermis. Nicotinamide is a good synergistic partner, which can properly strengthen the self-synthesis of ceramide and slightly accelerate the repair of epidermal barrier. But both of them may cause intolerance and need to be cautious. It is generally recommended to start with a low concentration of both or only a high concentration.
(2) Adenosine: Adenosine can also improve epidermal differentiation, and can also enhance each other when combined with retinol. A big problem with acid/alcohol is the side effect of peeling. Genistein can slow down peeling and is also a good whitening ingredient, so it is a very good A-acid partner.
(3) Moisturizing ingredients: ceramide, repair vegetable oil, squalane, etc. , while playing a full sealing role, it can also play a role in repairing and moisturizing. Allantoin, dextran, B5, licorice essence and other sedative ingredients can diminish inflammation and reduce redness, and help the skin to temporarily pass through the abnormal differentiation period.
Must I turn off the light after drinking?
No, but it's best not to use it during the day.
Before using alcohol A, you should first do your homework on nicotinamide and alcohol A, especially alcohol A, and pay more attention before using it. It is recommended to try the barrier when it is healthy.
It is not recommended to use high dose and high concentration at the initial stage of use. The recommended dose is gradually increased from twice a week to three times. In the process of use, peeling, dryness, tingling, redness and acne may occur, but not limited to. These problems will usually be alleviated in the next 2- 12 weeks. If these problems occur, either stop using or reduce the dosage, and use it with mild moisturizing products to reduce discomfort. After the problem is alleviated, it will be gradually increased.
Note: If you don't have the above problems during use, you may wish to steal Lele, so don't worry that Class A products are ineffective for you, so you won't respond. After all, side effects or adverse reactions do not necessarily occur, and everyone's probability and methods are different.
What is a class A ingredient?
This class A component refers to vitamin A alcohol and its derivatives. There are usually retinol, retinaldehyde, retinol ester and so on. It is very common in skin care products. As for vitamin A acid, it is a drug and will not appear in skin care products. The vitamin A we talk about every day is actually retinol.