I don't know if you have noticed, some cosmetics boxes are written to protect from light, what kind of light is this avoided?Why do you need to keep it out of the dark?This question must have been confusing for a long time, and today we will discuss with you the problem of skin care products avoiding light.
What kind of light is avoided by avoiding light?
Avoiding light refers to avoiding "sunlight", rather than indoor light, computer light, mobile phone light and other non-natural light, so you can rest assured that you can lie on the bed and play with your mobile phone after wiping skin care products.
As can be seen from the above table, the ultraviolet content of artificial lamps in daily life is relatively low, and the effect on ** is negligible.
Why avoid light?
The reasons why skin care products need to be protected from light vary from the others, but they are mainly divided into two points: the ingredients in skin care products will undergo photosensitivity, and the other is that the active ingredients in skin care products are easy to oxidize and decompose when exposed to light.
Photosensitivity reactions
Photosensitivity refers to the fact that some ingredients will absorb the corresponding wavelength of energy when exposed to sunlight, and in the process of releasing energy, it will destroy human tissues, resulting in symptoms such as itching, erythema, edema, etc., and in severe cases, it may also cause blisters.
Photosensitivity reactions induced by external factors can be further divided into phototoxic reactions and photo** reactions according to the pathogenesis.
For example, the popular morning C and evening A, where A is retinol (retinol), or tretinoin, and derivatives of retinol, are strongly recommended to avoid light after use, so this is the reason why many retinol products are night creams
See light decomposition
Among the ingredients of skin care products that need to be protected from light, we will see this ingredient, they will not produce photosensitivity, but they are easily oxidized and decomposed when exposed to sunlight, which greatly reduces the effect.
The most representative of this type of ingredient is vitamin C, protected from light, in order to function better.
Vitamin C has many advantages, not only can it remove freckle and whiten, but it is also a natural antioxidant to help ** cells fight free radicals. However, it is easy to be oxidized and yellowed in the air. Therefore, it is generally recommended that everyone use skin care products containing vitamin C at night. If you insist on using it during the day, you must strictly protect yourself from the sun.
Storage myths about skincare products
There are some commonalities in the storage of skin care products, such as keeping them away from light and cold, and using them within three months after opening the lid as much as possible. But there are also many storage pitfalls, and here are a few:
Myth 1: Skincare products can prolong life when kept in the refrigerator
If there are other fresh foods in the refrigerator, it is easy for bacteria to invade and spoil if the skincare products that have been opened are not tightly sealed!Moreover, when entering and exiting the refrigerator, it is hot and cold, which will accelerate the premature deterioration of skin care products.
Myth 2: Keep skincare products in the bathroom
Many sisters like to put skin care products in the bathroom, but they don't know that the high temperature above 35 will destroy the emulsifier of cosmetics, and the high temperature in the bathroom is easy to breed bacteria, which will make the product more likely to deteriorate.
Myth 3: Because of the fear of waste, the whole is easy to deteriorate
Sometimes I accidentally pour too much, so I just pour it back in. If you put your hands and brushes in the bottle without cleaning them, it is likely to accelerate the deterioration of your skincare products. It is advisable to use skincare products with clean hands, or to access the products with special tools, and avoid mixing them with others.
Finally, you don't need to worry too much, after all, skincare products are not drugs, the most important thing is the feeling of use, and you can also test it behind the ear before using it.