At present, many brands have introduced hyaluronic acid-based moisturizing products, and others have developed the concept of [hyaluronic acid stock solution], claiming that the effect is very good.
In fact, in the cosmetics market, moisturizing products have always been the main force of various brands, but even so, some people always ask: [How to do a good job of moisturizing skin? ] Let’s introduce hyaluronic acid skin care products and skin moisturizing.
Hyaluronic acid is what? Can it really [replenish water]?
Hyaluronic acid, also known as hyaluronic acid, A large number of human connective tissue and dermis layer, is a transparent gelatinous substance, absorbing water capacity is very strong, is the skin moisturizing factor, can play the function of locking water, make skin plump, reduce wrinkles caused by dryness. With the growth of age, hyaluronic acid loss speed is faster than growth speed, skin will gradually become lack of water.
As a skin moisturizing ingredient for external use, hyaluronic acid is relatively safe. In addition to some skin disease patients or people with skin ulceration, there is basically no taboo in use. Just remind, hyaluronic acid for cosmetics and hyaluronic acid for medical beauty injection are completely different.
Sounds good, doesn’t it? However, hyaluronic acid applied externally cannot enter the skin at all. Hyaluronic acid applied externally can only moisturize the epidermis and cannot be added with extra water.
Is hyaluronic acid stock solution suitable for moisturizing?
This is not the case.
There is a kind of so-called [hyaluronic acid stock solution] on the market, The concept is that it contains 100% hyaluronic acid. Hyaluronic acid in cosmetics is generally in the form of sodium hyaluronic acid salt, which is highly absorbent. After hydration with water, it will form transparent colloid. Each gram of sodium hyaluronic acid salt can easily absorb 100 grams of water. Therefore, some people think that such a high water content component can be used as a skin moisturizer.
However, hyaluronic acid itself does not prevent water from evaporating, and will soon become a dry film due to water evaporation, losing its moisturizing effect. This film will instead make skin drier. Some people may find that after using hyaluronic acid products for a period of time, [mud] can be rubbed out of their faces, which is hyaluronic acid that has dried out of water.
Therefore, hyaluronic acid is not suitable for use as a moisturizing product alone.
However, because hyaluronic acid has a huge molecular weight and cannot be absorbed by the skin, when hyaluronic acid on the skin surface dries and sprays some water, it can temporarily restore the feeling of smoothness and tenderness.
Why is the skin dry?
Where does the moisture in the skin come from? It is the water in the food we eat or drink that is absorbed by the digestive system, transported to the dermis through blood vessels and then supplied to the epidermis. Therefore, insufficient drinking water can also lead to dry skin.
Now you should understand that cosmetics that claim to replenish water for skin through external use are just advertisements of merchants. It is difficult for skin to keep moist by absorbing external water.
Why is the skin dry, peeling and chapped? This is because the skin’s water holding capacity is insufficient and the water in the skin is lost too fast.
Normally, The stratum corneum, the outermost layer of the skin, will be firmly and neatly arranged. There is intercellular lipid between keratinocytes, which can stabilize keratinocytes and form a protective barrier with stratum corneum. At the same time, sebaceous glands in pores will secrete sebum, which will form a hydrophobic film outside keratinum after mixing and emulsifying with sweat, and can moisten the stratum corneum, making the stratum corneum soft and neatly arranged, thus making the protective barrier more complete.
However, if the stratum corneum is dry and atrophic, and the arrangement is disordered, it cannot effectively retain water. If sebum secretion is insufficient, the water evaporates faster. At this time, the skin will suffer from dryness.
How to moisturize your skin?
To moisturize the skin well, it is necessary to form a closed film on the skin surface.
However, before discussing the ingredients, it should be explained that when many people use moisturizing products, they may apply uneven or insufficient thickness, resulting in poor moisturizing effect.
Therefore, I suggest that no matter what kind of moisturizing product is used, it must be evenly smeared and the thickness must be sufficient. When smearing, you can smear more to completely cover the skin as much as possible.
The following three ingredients can help skin moisturize:
- Grease: Apply a layer of grease to the skin surface, Can cover the skin stably, Forming a closed type, It can prevent the moisture in the skin from evaporating outward to a great extent. At the same time, Grease also softens cutin, Arrange the cutin neatly. Hydrophilic polymer: Some hydrophilic polymer components, Such as hyaluronic acid, collagen or polysaccharide, after absorbing water, Smear on the skin surface, can also reduce moisture evaporation. Moisture: The best water content of the stratum corneum is 10% ~ 30%. Smear water on the skin surface can also make the cutin absorb water softly, make the cutin arrange more neatly and tightly, and leave moisture in the skin. Therefore, smear some moisturizing products with high water content will also have certain effects.
Therefore, a good moisturizing product should have the following ingredients:
Sealing ingredients: Common dynamic vegetable oils, mineral oils, synthetic oils or polymer film-forming ingredients, such as hyaluronic acid or collagen, can form sealing films on the skin surface.
Moisturizing ingredients: common vegetable oils, mineral oils and synthetic oils can soften cutin.
Water-locking ingredients: Polyols, such as glycerol, sorbitol or propylene glycol, can combine with water in skin to reduce the evaporation rate of water molecules.
Small molecular water absorbing components: such as urea, lactic acid, tartaric acid or provitamin B5, etc., can attract moisture from the dermis layer to the epidermis layer.