In the hot summer, the biggest comfort in the world is the air-conditioning wifi iced watermelon.

If I can put on a cool mask again, this summer may be a little more comfortable.

Do skin care products need to be put in the refrigerator?

As an old rule, from the perspective of ingredients, which ingredients in skin care products need to be "fresh"?

Vitamin C (ascorbic acid)

Vitamin C is indispensable in our body's antioxidant mechanism. Through the circulation between ascorbic acid and semi-ascorbic acid groups, it can not only scavenge oxygen free radicals, protect collagen, and block the formation of melanin, but also reduce other antioxidants. , let them "resurrection" and have antioxidant capacity again.

The role of ascorbic acid in the body's antioxidant free radical cycle is crucial.

As a whitening ingredient, ascorbic acid reverses the oxidation of dopa to dopaquinone (a key step in melanin formation), thereby reversing the formation of melanin pigmentation.

L-Ascorbic Acid is the original and most active and effective form of vitamin C. At the same time, because it is too active, the oxygen in the air may also oxidize it to form a yellow to brown liquid. The higher the concentration of vitamin C essence (>15%), the more difficult it is to maintain a clear, colorless and transparent state for a long time.

You may have encountered these situations in your life: for example, sometimes the newly purchased vitamin C essence is brown after opening the bottle. Or, when the bottle was first opened, the vitamin C essence was still light in color, and after a period of use, it "gradually darkened". The high-concentration vitamin C essences on the market today are all packed in brown. At the same time, the bottle will be filled with inert gas (argon or nitrogen) before leaving the factory to drive out the air in the bottle. These measures are all to make vitamin C better preserved.

A little discoloration is actually not worth making a fuss about. For example, CEF Essence, the famous work of Xiulike, has ascorbic acid content as high as 15%, and it turns into a light yellow color, which is still transparent and clear, indicating that only a small part of vitamin C is oxidized, right. Product efficacy has little effect.

However, if it is not stored properly during use, if you do not remember to seal it after each use, the liquid will turn into the color of soy sauce, but it will have no effect.

For high-concentration vitamin C (ascorbic acid) essence, summer is actually not easy. Keeping it away from light and refrigerating will help to maintain its activity, and it will not change color at all.

I did a simple test with my own essence configured according to the CEF ratio.

Simulated summer environment vs.beauty refrigerator after 4 weeks at 10 degrees Celsius

Vitamin A

The name of A-alcohol is retinol, which is a member of the vitamin A family. The name is actually quite meaningful, because it is an essential substance for vision. Retinol, which is converted from retinol, produces conformational changes under light, stimulates the optic nerve, and is the basis for vision.

The vitamin A family in animals mainly comes from the vitamin A precursor in practical plants, beta-carotene. One beta-carotene molecule can be converted into two retinal molecules by enzymes, and then converted into retinol, which is stored in in the liver.

Another major role for the vitamin A family is on the skin, where retinoic acid plays a role.It's not a nesting doll, it's that complicated.

Retinoic acid itself is highly irritating, and it is not allowed to be added in cosmetics. It can only be used in medicines, called tretinoin, and the third-generation adapalene, which is mainly used for acne. Only vitamin A alcohol, vitamin A aldehyde and their derivatives can be used in skin care products. Derivatives refer to esterification products such as vitamin A palmitate and vitamin A propionate, which are more stable and safer than the first two. However, since vitamin A alcohol and vitamin A aldehyde are closest to the end point vitamin A acid in the physiological metabolic pathway, they have the fastest effect.

Although the vitamin A family has excellent effects, its own irritation and phototoxicity are its biggest drawbacks.

Due to its strong irritating effect, A acid is banned from being used in cosmetics. Several products of A-alcohol and A-aldehyde that can be used in cosmetics are irradiated by UVB and UVC in ultraviolet rays, and they are all cytotoxic (so the arc of direct viewing of electric welding can damage the eyes; the snow on the ground in cold areas can cause snow blindness).

Not only that, but UVA-irradiated A-alcohol releases damaging oxygen free radicals, a property that is rare in many vitamins.

I once did an experiment with retinyl palmitate. I put the lotion containing retinyl palmitate in a red box at a constant temperature of 40 degrees Celsius. The formula contains the same fat-soluble vitamin E as a protective agent. After two months The content of retinyl palmitate was tested, and it was found that less than half of it remained, and the color had turned significantly yellow.

The emulsion under low temperature refrigeration does not change much.

Astaxanthin

Astaxanthin was first discovered in the shells of shrimps and crabs, so it was named "Astaxanthin". Later, scientists discovered that shrimps and crabs themselves could not synthesize astaxanthin, they were only diners, the real astaxanthin. The source is algae. Today, many big-name products do not actually see the word "astaxanthin" on the ingredient list, but "Haematococcus pluvialis extract".

In essence, astaxanthin is a natural carotenoid, which is also reflected in its orange-red color and fat-solubility. In the past, astaxanthin was often used in salmon feeds. more vivid.

Because it is a carotenoid, it has an outstanding effect on singlet oxygen free radicals, and its ability to neutralize singlet oxygen is about ten times that of beta carotene. Reduce the oxidative stress on the human body, ease the degradation of collagen, and protect the bilayer lipid structure of cell membranes.

As a fat-soluble natural color, the color of astaxanthin is quite bright, otherwise the salmon will not turn orange because of its flesh.

The color is bright, but it fades quickly. If it is not refrigerated and protected from light, the color of astaxanthin will become lighter and lighter, contrary to vitamin C. Some products on the market that claim to contain astaxanthin are not even pink, which makes people wonder how trace amounts of astaxanthin are in them.

The bright orange salmon flesh will fade gradually if it is not eaten immediately after thawing, so when serving, there are usually ice cubes under the salmon. In the same way, skin care products containing astaxanthin are worth keeping in the refrigerator in summer.

The lipstick that was "crying hot" in summer

I received a message from a fan saying:
"There are always a few crying MACs every summer"

Why is lipstick "hot crying"?

This is because the grease or silicone oil inside is not well matched with the wax, so it seeps out, which is similar to the reason why a poor quality lotion has been left for a long time and delaminated.

Such a lipstick is not necessarily risky to use, but it is disgusting and difficult to spread.

Refrigeration is the best way to avoid this embarrassment. Note that it is not freezing. If the lipstick is frozen too hard, it will not only be difficult to spread, but also easily scratch your delicate lips. If you use too much force, it will break.

The refrigerator tested this time is a beauty-specific refrigerator provided by Cooseon.

Beauty Refrigerator Features:

Dual temperature adjustment: 10°C cold compress mode in summer and autumn and 18°C ​​warm compress mode in winter and spring. The temperature is moderate to protect sensitive ingredients without freezing makeup.

Home refrigerators are usually set at 4 degrees Celsius for freezing and -18 degrees Celsius for freezing, which are a bit too cold for products to be used on the face. There are many other small refrigerators on the market, but most of them are direct cooling systems, the local temperature is lower than 4 degrees Celsius, and they are not suitable for storing skin care products. .

This capacity is only 5 liters, the internal temperature is uniform and stable, and the noise is particularly low, which is more suitable for the bedroom dresser.

Compared with the large refrigerator at home, the special small refrigerator is more hygienic. After all, it's embarrassing to put cosmetics and food together, and it's embarrassing to smell it. What does it feel like to wear a barbecue-flavored lipstick.

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