How to use VC serum?

Principle 1, first, apply the low viscosity.
Usually, serums have less oil, while lotions contain higher oil than those contained in serums. You should apply the serum if the cream has a greasy feeling. If the ointment is used for oily skin, it will prevent high moisture, so you should apply the lotion first, then apply the serum, and the effect will be better.
Principle 2, apply the one with high moisture content first.
If you know the moisture and oil content, you should apply the one with high moisture content first, followed by the product with high oil content. So, for example, if the serum has more oil and the nutrient cream has more moisture, you should apply the nutrient cream first.
Principle 3: Apply the one that can penetrate deep into the skin first
If you want to use a serum and an eye cream, you should apply the serum first and then apply the eye cream. Because the skin around the eyes is more sensitive than other areas, using the serum first will be more effective. Likewise, applying an essential product first to penetrate deep into the skin before applying a UV barrier cream that works on the epidermis also follows this principle.
Principle 4: Apply whatever products you want to see first
Even if it is the same serum, you should apply the one you want to see the effect first. Some serums are used before make-up. It is best to use this serum before using lotion. Products containing exfoliating ingredients should also be applied before the cream, which is the correct order.
Should I avoid cell phones and lights for vitamin C?
It is best to avoid light because VC is not stable under light conditions.
1, skin care products containing vitamin c inducer, when used during the day, be sure to apply sunscreen and avoid all kinds of exposure to the sun. Otherwise, there is a risk that it will not only not whiten but also darken or spot. So try not to use it during the day, it is more suitable for use at night.
2, because the stability of VC is not good enough, generally, under the normal state are kept in the dark container. It is to avoid the decomposition under the light.
3, many advanced cosmetics use VC complexes, which are more stable.
Lipidated VC is phototoxic.
Esterified VC (ascorbyl palmitate) is phototoxic, which is an opinion commonly shared by many science numbers. AA6P is often used as a protective agent in the food industry, and available studies confirm its excellent resistance to lipid peroxidation. There is only one foreign literature on the phototoxicity of AA6P, and it has been pointed out that there are logical problems and the conclusions are unclear. It can only be said that from the studies available so far, it is impossible to conclude that lipidated VC is phototoxic. Of course, no corresponding study proves that lipidated VC is not phototoxic. And the amount of AA6P added to the product is generally relatively small, and there is no effect of good sun protection during the day. So, for products containing lipidated VC like Loton cc essence, it is lovely to use during the day (good sun protection is essential at all times). The cutie who can’t let go of the heart then uses it at night.
Vitamin C is not photosensitive. So then, how did the misunderstanding of “vitamin C will turn dark during the day” come about? We all think that citrus fruits contain vitamin C, and even think that the content is not low, and there is a photosensitive substance called furanocoumarin in these fruits – I remember that there are some rumors that drinking lemon water will turn black and so on in the past few years, probably from the same source. However, although there are furanocoumarins in lemons, the content is far from being able to produce the degree of damage. Lemon water is to swallow lemons raw; you must eat hundreds of them at a time to feel the skin photosensitive reaction.
So you can use it during the day? The ability to use VC in the daytime lies mainly in the presence or absence of UV rays. Vitamin C is easily oxidized when exposed to air, and UV rays promote oxidation, which means that using skin care products with high concentrations of vitamin C during the day will do little harm to your face. Still, your wallet may be hurt – the essence you paid a lot of money is killed by the combined efforts of oxygen and UV rays. Many skin care products with VC ingredients are not recommended for daytime use not because of light sensitivity but because of the synergistic effect of other elements. For example, in addition to vitamin C, Lektan CC also contains a variant of vitamin C called ascorbyl palmitate, which may increase the number of free radicals in the skin when it encounters UVB rays and is not only not an antioxidant but also an oxidant.
How much VC should I take every day? Many animals can synthesize VC from glucose, but the human body cannot, and the primary source of VC for the human body is dietary intake. Vegetables and fruit intake is the primary source of VC. However, there is no scientific data on how much VC to take to achieve the whitening effect. Fruits and vegetables can not only supplement VC, but also VE and other ingredients that may have a synergistic effect with VC to enhance the whitening effect; and increasing vegetable and fruit intake can also assist in anti-cancer, anti-inflammatory, antioxidant, and reduce the probability of chronic diseases such as cardiovascular disease.