Why should A alcohol be used away from light? Precautions for using A alcohol

Rea alcohol is an active ingredient in skin care products. We can see it in many anti-aging products. It is not only antibacterial and anti-inflammatory, but also the most effective anti-aging product among all skin care ingredients. However, there are many precautions when using rea alcohol. How much do you know about it?

A alcohol will exfoliate the skin, making it more vulnerable to UV damage; so keep it out of the sun.

The reasons why skin care products need to be used away from light vary, but they are mainly due to two reasons: the ingredients in skin care products will cause photosensitivity reactions; and the active ingredients in skin care products are easily oxidized and decomposed when exposed to light.

Photosensitivity

Photosensitivity reaction means that some ingredients will absorb energy of corresponding wavelengths when exposed to sunlight. In the process of releasing energy, they will damage human tissues and cause symptoms such as itching, erythema, and edema on the skin. In severe cases, it may also cause blisters.

In short, the damage of photosensitivity to the skin is much more serious than direct exposure to the skin by ultraviolet rays in the sun. Fortunately, among the many skin care ingredients, there are not many that cause photosensitivity. Let's talk about vitamin A, which is more familiar to everyone.

Retinol, also known as retinol, is not photosensitivity, but it has poor stability. When exposed to heat, water, ultraviolet rays, and even air...peroxidation reactions will cause it to lose its biological activity.

When applied to the skin, retinol is converted into retinaldehyde, and then into retinoic acid, which is photosensitive.

1. Build tolerance

Gradual method - test locally first, then gradually expand to the whole face; after moisturizing cream, start with half the amount, and use it every other day or every two days at night. After two weeks without any abnormality, you can slowly increase the amount, use it every other day or every day. Although retinol is a strong drug, it also needs to be used for more than two or three months, so don't rush.

2. Use with other ingredients

(1) Niacinamide: Retinol makes the epidermis thinner, and niacinamide is a good synergistic partner. It can appropriately strengthen the synthesis of ceramide and slightly speed up the repair of the epidermal barrier. However, both of them may cause intolerance, so you need to be cautious. It is generally recommended to start with low concentrations of both, or only one high concentration.

(2) Adenosine: Adenosine can also improve epidermal differentiation, and can enhance the effects of both when used in combination with retinol. A big problem with retinol/retinol is the side effect of peeling. Genistein can slow down peeling and is also a good whitening ingredient, so it is a very good partner for retinol/retinol.

(3) Moisturizing ingredients: Ceramide, repairing plant oil, squalane, etc., can repair and moisturize while playing a sufficient sealing role. Allantoin, glucan, B5, licorice extract and other calming ingredients can relieve inflammation, reduce redness, and help the skin temporarily survive the abnormal differentiation period.

No, but it is best not to use it during the day.

Before using retinol, you must first do some homework on niacinamide and retinol, especially retinol, which requires more precautions. It is recommended to start using it when the barrier is healthy.

It is not recommended to use large doses and high concentrations in the initial stage of use. It is recommended to start using it 2 to 3 times a week and gradually increase the dosage. During use, you may experience but are not limited to: peeling, dryness, stinging, redness, swelling, and increased acne. These problems will usually ease within the next 2-12 weeks. If the above problems occur, either stop using it or reduce the dosage and use it with mild moisturizing products to reduce discomfort. After the problems are alleviated, gradually increase the dosage.

Note: If you do not have the above problems during use, you may as well enjoy it secretly. Don't worry that the Class A product is ineffective for you. After all, side effects or adverse reactions do not necessarily occur. The probability of occurrence is different for each person, and the way they occur is also different.

This Class A ingredient refers to vitamin A alcohol and its derivatives. Commonly found in skin care products: retinol, retinal, retinol esters, etc. As for vitamin A acid, it is a drug and will not appear in skin care products. The vitamin A we talk about in daily life is actually retinol.