Vitamin C: Benefits of Vitamin C Serum, Foods, Supplements, Tablets

vitamin c tablet
vitamin c

To be honest, vitamin C essence is really indispensable when you are old! There is a big difference between using and not, you will understand after reading

Yesterday, I posted this picture before and after using Vitamin C for one year.

Many small partners leave messages to write about Vitamin C related content. In fact, Miya said before: Now that various ingredients are emerging in endlessly, everyone is chasing the ingredients all day long, it is really better to stick to vitamin ABC steadily. These classic old ingredients are backed by reliable data. Standing tall for many years must have its strengths.

In the past year or so, I also used it casually before and then insisted on using Vitamin C and Vitamin A. It did see good results.

OK, let’s talk about Vitamin C with you today~

What is the importance and effect of vitamin C on the face?

Vitamin C is an antioxidant that can resist free radicals, delay aging, and beautify the skin. Moreover, vitamin C is water-soluble and can be dissolved in water. So what is the effect of dissolving vitamin C in water to paint the face? What is the effect?

1. The role and effect of vitamin C on the face

1. Whitening

As an antioxidant, vitamin C can inhibit the activity of tyrosinase in the body, reduce the formation of melanin in the skin, and reduce melanin to play a “bleaching” effect, thereby diminishing stains and making the skin white and tender.

2. Brighten skin tone

Frequent application of vitamin C on the face can soften the stratum corneum of the skin, help vitamin C be absorbed by the skin, and make the skin brighter. However, long-term use will cause certain damage to the stratum corneum of the skin, especially the thin stratum corneum. Sensitive skin is recommended to use with caution.

3. Prevent wrinkles

Vitamin C coating on the face can moisturize the skin, improve the roughness of the skin, promote the formation of collagen, make the skin smooth and smooth, and can also prevent the formation of wrinkles.

2. Is it true to use vitamin C to disfigure the face?

Incorrect operation can cause damage to the skin.

1. Vitamin C tablets cannot be directly used to wipe the face, because vitamin C tablets are easily oxidized in the air, which will cause the skin to turn yellow after oxidation; and vitamin C is acidic, and directly applied to the face will cause damage to the skin. It is very irritating and may cause symptoms such as redness, swelling and pimples on the skin.

2. Some people with allergies may be allergic to vitamin C. After rubbing their face, they may experience allergic symptoms such as skin itching, redness and swelling. You need to test a small area before confirming that you are not allergic before continuing to use it.

3. Why is the face black after applying Vitamin C?

Vitamin C is easily oxidized when used directly.

Vitamin C has a certain effect on improving skin elasticity, reducing melanin, and anti-oxidation. However, vitamin C will be oxidized when exposed to the air directly, and its oxidation rate is greater than that of being absorbed by the skin, which often results in vitamin C before being absorbed by the skin. It was oxidized and turned yellow, so it looked like the face turned black.

Vitamin C is easily destroyed by light. For better results, it is recommended to use it at night and also pay attention to sunscreen in daily life.

4. The correct usage of vitamin C on the face

1. Adding lotion: Mix vitamin C powder with the lotion and essence that you usually use, and then apply it on the face while massaging to make the skin fully absorbed. It can moisturize and moisturize the skin while effectively exerting the role of vitamin C. Play a whitening and freckle effect.

2. Add Vitamin E: Vitamin E can soften the stratum corneum and also has the effect of lightening spots. Using the two together, the effect will be better and the skin will be more delicate and shiny.

3. Add glycerin: Use vitamin C powder mixed with glycerin. Glycerin can soften the skin’s stratum corneum, moisturize and moisturize. It can help vitamin C to be absorbed and utilized by the skin, dilute and remove melanin deposited on the skin.

vitamin c

What is the effect of Vitamin C in skin care products?

I believe that everyone is more concerned about the effect of vitamin C on skin care, so let’s go straight to the topic, not to mention the source of vitamin C ingredients.


Human skin will produce active oxygen free radicals, such as superoxide anion peroxide and singlet oxygen after being stimulated by ultraviolet rays. The oxidative stress response can activate skin cell activities mediated by transcription factors. ROS can up-regulate transcription factor activator protein-1, and AR-1 promotes the production of matrix metalloproteinases, which leads to the breakdown of collagen. At the same time, it also produces many inflammatory mediators that cause skin aging, which triggers photoaging and leads to the degeneration of skin elastic tissues.

Vitamin C acts as an antioxidant, protecting the intracellular structure from oxidative stress by supplying electrons and neutralizing free radicals. At the same time, vitamin C can also help regenerate the oxidized form of vitamin E. The synergistic effect of vitamin C and vitamin E can enhance antioxidant and photoprotective effects.

Promote the synthesis of collagen and elastin;

Ascorbate is a cofactor for prolyl and lysyl hydroxylase. This enzyme is responsible for stabilizing and helping cross-link collagen. At the same time, ascorbate can directly stimulate collagen synthesis by activating the transcription of collagen mRNA and helping to stabilize it. In addition, there are data to prove that topical vitamin C can increase collagen production in human skin.

Light protection

We said before: It is very necessary to add antioxidants to sunscreen. Studies have shown that even if the sunscreen is used correctly, it can only block 55% of the free radicals generated by UVA exposure. Therefore, the combination of sunscreen and antioxidant can provide better UV protection.

Although vitamin C cannot absorb ultraviolet light, vitamin C can reduce sunburn and sunburn caused by ultraviolet rays and UVB, and at the same time reduce skin light damage caused by UVA.


Adding vitamin C to artificially cultured cells can significantly reduce the activity of inflammatory cytokines. The anti-inflammatory effect of vitamin C is also used by North Dermatologists to treat various inflammatory skin diseases such as acne.

Inhibit melanin;

External use of vitamin C can inhibit tyrosinase activity, and at the same time can be used as a reducing agent of dopaquinone.

Everyone knows that hydroquinone is the best whitening ingredient, but in a randomized double-blind half-face control experiment, 5% vitamin C and 4% hydroquinone were compared for the treatment of melasma. Hydroquinone can improve chloasma by 93%, and vitamin C can reach 62.5%.

Although the effect of vitamin C in lightening the pigment is not as strong as that of hydroquinone, the side effects of vitamin C are much smaller than that of hydroquinone. Therefore, vitamin C is also considered to be a more effective whitening ingredient.

2. Drawbacks of dimension C;

Vitamin C is indeed effective in skin care, but its shortcomings are also obvious, such as:

  • Poor stability, easily oxidized when exposed to air and sunlight;
  • It needs to be effective when the PH value is lower than 3.5. There are certain requirements for the product formula, and it is obviously irritating to the skin;
  • Water-soluble ingredients are not easily absorbed through the skin. Need to formulate methods to help its penetration and absorption. Therefore, it is recommended that you try to choose products from big brands and manufacturers when choosing products.

3. Dimension C product recommendation;

beginner level;

Here, the pure vitamin C and similar vitamin C derivatives with a concentration of 5% and below are classified as entry-level products.

  • Kiehl’s Whitening and Brightening Essence;

This is a vitamin C derivative with a concentration of about 2%-5%. Although the vitamin C content is not high, it is combined with salicylic acid to promote skin keratin metabolism.

  • Rohto CC essence;

The use of 5% pure vitamin C combined with ascorbyl palmitate and tocopheryl acetate has good anti-oxidation and whitening effects. At the same time, the compound dipotassium glycyrrhizinate helps anti-inflammatory and soothing. Very cost-effective~

  • MD DSP new revitalizing and rejuvenating essence;

5% AA2G (ascorbyl glucoside) is combined with tranexamic acid and ethyl resorcinol, and there is also a low concentration of pure vitamin C. The skin feel is more refreshing than the pure vitamin C, and the brightening effect is obvious.

  • ISDIN L-C Moisturizing Essence;

5% pure vitamin C with 3% proteoglycan, vitamin E and thioneine. Anti-oxidation + brightening effect is obvious. The disadvantage is that it is oily, and the skin feel is not as good as MD.


  • Kiehl’s Vitamin C Firming Essence;

10.5% pure vitamin C+2% ascorbyl glucoside, together with HEPES to help skin keratin metabolism. Good whitening and anti-aging effects. The disadvantage is that the feeling of silicon is heavy, and the texture is too thick, oily skin may not like it.

  • Shilefu 10% Vitamin C Essence;

10% pure vitamin C + panthenol + 3 kinds of ceramides and fat-soluble vitamin E. Alcohol is irritating, so it is not recommended for sensitive skin.

  • Clinique Fresh Vitamin C Repair Ampoule;

10% concentration of pure vitamin C with salicylic acid and three kinds of peptides have full anti-oxidation, whitening and anti-aging effects. Vitamin C and Essence are packaged separately, and are now adjusted to reduce the risk of Vitamin C oxidative inactivation. The disadvantage is that the sense of silicon is obvious, and occasionally there is a risk of rubbing mud.


Master grade product concentration is basically 15%-20% pure vitamin C products. There is a certain irritation, it is recommended to start from a low concentration to establish tolerance and then gradually upgrade.

  • Xiulike CE/CF essence;

Speaking of Vitamin C Essence, how can you not mention Xiuli Ke? CE and CF are also classic products in Vitamin C essence. Xiulike’s research found that the combined use of 15% vitamin C + 1% vitamin E can increase the photoprotective effect of the original product by 4 times.

At the same time, ferulic acid can improve the stability of the combined use of vitamin C and vitamin E. Using 0.5% ferulic acid can increase the photoprotective effect of the original vitamin C + vitamin E combination from 4 times to 8 times. And Xiulike’s CE and CF essence are such products.

Both are classic products. The CF essence contains alcohol and the texture is relatively refreshing. It seems that there are no disadvantages except that it is expensive.

  • Drunk Elephant VC Essence;

15% pure vitamin C + 1% vitamin E + ferulic acid, is this part similar to the Xiulike formula? No wonder Xiuli can sue Drunk Elephant for infringement. In addition, Zuixiang adds pumpkin enzyme extract to promote keratin metabolism. The effect of using this with Clinique Blemish Essence is still very obvious. In addition, both products have ingredients that promote keratin metabolism, and the skin is really smooth.

  • OBAGI Vitamin C Essence;

Obagi’s vitamin C essence is very complete, from 5% concentration to 20%. The pure vitamin C + ascorbyl glucoside has obvious whitening and antioxidant effects. However, both 15% and 20% products contain alcohol. Those who are more concerned about alcohol need to be cautious.

​3. Suggestions for the use of dimension C products;

Regarding concentration;

The effectiveness of pure vitamin C has certain requirements on the PH value and concentration of the product. Personal advice is to start with a low concentration to establish tolerance. If the skin tolerance is OK, it is recommended to use a high concentration of 10% or 15% of pure vitamin C for a long time.

Regarding use;

Pure vitamin C is easily oxidized when exposed to air and sunlight. Therefore, it is recommended to buy it now and not to stock up for a long time. It is likely that the stocking time will cause the ingredients to become inactive and affect the efficacy.

In addition, many friends asked if Vitamin C could be used during the day? To be sure: Vitamin C can be used during the day. In addition, the photoprotective effect of vitamin C can help enhance sun protection, and it is recommended to use it during the day.

Yellow with Vitamin C?

Yellowing with vitamin C is actually caused by dyeing. If the yellowing is serious, you can reduce the dosage, and if you mind, just use it at night or not.

Is oral vitamin C supplementation reliable?

Many friends ask whether oral vitamin C supplements are useful. Studies have shown that the amount of oral vitamin C that actually reaches the skin is very limited due to the influence of the intestinal transport mechanism. On the contrary, if it is taken in large doses in pursuit of efficacy, it is not conducive to health. Therefore, if you want to be effective on the skin, it is recommended to apply topical vitamin C products first.

OK, the above is today’s content, I hope it will be helpful to you ❤️~

vitamin c

Can products containing vitamin C be used during the day?

In the past, seafarers could not eat fresh vegetables for a long time while drifting at sea, and they were prone to [scurvy], which has a very high mortality rate. Later, it was discovered that people who supplemented with vitamin C would not be prone to [scurvy] again, so vitamin C Also known as ascorbic acid.

In fact, vitamin C is indeed a good thing: anti-oxidation, whitening and even anti-aging. The vitamin C effects claimed by businesses are increasing.

But as dimension C gets more and more popular, there are more and more sayings about dimension C”:

“Vitamin C Essence is used during the day, it will absorb light and make you darker”

“Vitamin C essence can only be used at night”

“When using Vitamin C Essence, avoid lighting, and mobile phone lighting will not work.”

Whether these are the truth or rumors, today we will take a deep look at Vitamin C.

Vitamin C and Antioxidant

First of all, vitamin C has the anti-oxidant ability of under-beating. Nowadays, many skin care products emphasize the effect of anti-oxidation, so what is oxidation and what is anti-oxidation?

When it comes to oxidation, we have to mention free radicals, also known as free radicals. The human body continuously produces free radicals in the body due to factors such as respiration (oxidation reaction), external pollution, radiation exposure, etc., due to continuous contact with the outside world . Free radicals are the most common endogenous biochemical factors associated with aging. The structure of free radicals is unstable. After entering the human body, they need to snatch electrons to become a stable structure. If they snatch electrons from cell protein molecules, the protein molecules that lose electrons will interact with chromosomes, mitochondria, cell membranes and other locations to cause skin aging.

Antioxidant is the abbreviation for Antioxidant Free Radicals. Anti-oxidation is any substance that can effectively inhibit the oxidation reaction of free radicals in a low concentration . Its mechanism of action can be to directly act on free radicals or indirectly consume substances that are prone to free radicals to prevent further reactions.

Vitamin C, as a relatively common antioxidant, is willing to donate its own electrons to free radicals for healthy cells, prevent free radicals from snatching electrons from protein molecules, and play an anti-oxidant effect.

Vitamin C, photosensitivity or photosensitivity

Photosensitivity refers to the fact that such substances will become other substances that are irritating to the skin when exposed to light, or increase the skin’s intolerance to ultraviolet rays.

When we say that vitamin C is photosensitive, in fact, vitamin C is sensitive to ultraviolet rays in light. Ultraviolet rays will accelerate the decomposition of vitamin C, but it does not harm the skin. Therefore, vitamin C does not have photosensitivity. At the same time, the stability of the new vitamin C derivatives in recent years is much higher, even under light, it can also play a role in resisting free radicals and enhance the skin’s tolerance to ultraviolet rays. Therefore, vitamin C is also added to many sunscreen products to combat free radicals generated by the skin due to ultraviolet radiation. However, before using the medicine, read the instructions carefully. If it says [cannot be used during the day], it is likely that there is a derivative of vitamin C [ascorbyl palmitate] in the product. This ingredient may increase the freedom of the skin when it encounters ultraviolet rays. The content of the base. In addition to this ingredient, other products that are not specifically labeled as unusable may be used during the day, but if you don’t want these vitamin C ingredients to be decomposed by the sun, you still have to apply sunscreen obediently.

As for the rumors that drinking lemonade will turn black, it is probably related to the richness of furanocoumarin in citrus fruits, and has nothing to do with vitamin C. Of course, although citrus fruits contain furanocoumarin, it does not mean that it will turn black after eating. Because the furanocoumarin content in the fruit is far from enough and causes physiological damage, it takes 350 lemons at a time to cause skin photosensitivity.

Finally, VC can be used during the day, and during the day it can also help the skin fight free radicals generated by ultraviolet radiation, but it is important to take sun protection measures and avoid direct sunlight as much as possible. In addition, lighting, mobile phones, and computers have no effect on the stability and efficacy of Vitamin C, so you can use it at night.


Can vitamin C tablets really whiten?

For girls, the answer to this question is obviously very important! After all, “One white hides one hundred ugliness”. Before, a male friend told Xiaoquanhuan that if two beauties, one has white skin but mediocre facial features, and the other beautiful facial features but looks black, it is certain at first glance. Will be attracted by the whiteness first…

Hahahaha… Xiaoquan is speechless, after all, Xiaoquan’s logic to look at beautiful women is also Jiang’s logic (cover your face)

Therefore, girls who have darker and yellower skin or who want to become whiter often express a strong yearning for “Ma Bai Shengxue”, and take any means to this end. Oral vitamin C tablets are one of the ways.

The whitening principle of vitamin C

First of all, there are many factors that determine whether our skin is black or white, such as genetics, sun exposure, endocrine hormone levels, etc., but generally speaking, the color of the skin mainly depends on the content of melanin in the skin.

The root of melanin production is tyrosinase. After a series of chemical and oxidation reactions, tyrosine in melanocytes forms eumelanin to reach the surface of the skin. If the skin’s metabolism is not smooth, it will cause a large amount of pigmentation and aggregation. , The color of the skin will deepen or the formation of spots will cause uneven skin, thus making people dark.

Therefore, inhibiting the biosynthesis of tyrosinase is the key to whitening. And vitamin C can inhibit the activity of tyrosinase, blocking melanin, have a certain antioxidant, melanin can be reduced to the already formed melanin front colorless substance, thereby to achieve the effect of improving dull skin whitening.

How much vitamin C can you eat to whiten without affecting your health?

According to the recommendations of the Chinese Nutrition Society and the Japanese Ministry of Health, Labour and Welfare and other authoritative organizations, in order to prevent people from getting sick due to lack of vitamin C, it is recommended that each person consume 100mg of vitamin C per day. This dose is generally enough to eat more fresh fruits and vegetables daily. Can be added.

If you want to achieve the effects of whitening, anti-oxidation, and promotion of collagen synthesis, scientific research has shown that you need to consume at least 1,000 mg of vitamin C per day. It is said that 1,000-2,000 mg of vitamin C per day is not only good for beauty, but also Will cause a negative reaction to the body.

However, the Chinese Nutrition Society recommends that the maximum tolerable intake of vitamin C is 1000 mg/day. Supplementing vitamin C in an appropriate amount can have the effects of firming skin, strengthening bones and teeth, enhancing immune function, promoting mineral absorption, reducing arteriosclerosis, anti-tumor and anti-oxidation;

Excessive intake (long-term intake of 1-4g or more per day) can cause high iron red blood cell anemia, diarrhea, abdominal pain, gastrointestinal bleeding and other gastrointestinal discomforts, which will reduce the body’s disease resistance and immunity. Some people can also cause hyperuricemia. Disease, accelerate the formation of kidney and bladder stones.

Therefore, it is best not to exceed 1000mg a day!


How to take vitamin C for the best whitening effect?

1. Eat 3 to 4 times a day. Because vitamin C is a water-soluble vitamin, generally speaking, it will be excreted with body fluids in 3-4 hours. For example, supplement 800mg of vitamin C every day, supplementing about 200mg every 3~4 hours, this can ensure the body’s vitamin C content, the absorption effect will be better, and the whitening effect will naturally be better!

2. Eat 1~2 hours after meals. Vitamin C can not be taken on an empty stomach, and do not take it with tea. It is best to take it after a meal. It is difficult to insist on it for a long time.

3. The water temperature of VC effervescent tablets should not be too high. Because vitamin C is not resistant to high temperatures, when taking vitamin C effervescent tablets, you should not dissolve them with overheated water, but use warm or cold water to dissolve them, otherwise the drug properties will be lost.

4. Keep taking it. Depending on personal physique, the effect will be more obvious after oral administration for at least 3-6 months, because it is absorbed by the body through the intestines and stomach, and it takes a process to gradually help the cell renewal to improve the skin color from the root, otherwise the melanin that has just been repelled will be Quickly cheer up, and the skin color will return to before liberation…. In addition, insisting on eating VC on weekdays also has a certain effect on whitening and lightening spots!

5. Do a good job of sun protection. Don’t think that taking vitamin C is immune to ultraviolet rays. Take vitamin C while basking in the sun. Even if vitamin C is a magical medicine, it will not work!

PS: Just buy the cheapest pharmacy, there is no need to buy any brand, the effect is actually the same~~

Last reminder: Don’t stop the drug suddenly!

Long-term intake of quantitative vitamin C tablets and sudden withdrawal of the drug will cause a phenomenon called vitamin C withdrawal deficiency . The reason is that our body does not need so much vitamin C every day, and when the amount of supplement exceeds the required amount , The body will habitually excrete the excess amount. When one day we stop taking vitamin C tablets, the body will still habitually let the body excrete such a large amount of vitamin C. Unfortunately, it takes a while for our body to find out. This “error”…

During this period of time, it is very easy to cause the lack of vitamin C in the body, and it is more likely to suffer from scurvy than before taking the medicine, which is also called “rebound scurvy”. Therefore, when you stop taking vitamin C, you should also allow your body to have a transition period, and it is better to gradually reduce the dose.

In addition to taking vitamin C tablets for whitening, Xiaohuan suggests that everyone can also eat more VC-rich fruits and vegetables~~

  • Fruits rich in vitamin C include: prickly pears, fresh dates, kiwi, pears, apples, bananas, peaches, cherries, strawberries, lychees, etc.;
  • Vegetables rich in vitamin C are: pepper, bitter gourd, citrus, tomato, cauliflower, green leafy vegetables, cabbage, celery, lettuce, pumpkin and so on.

About Sarah A.

Sarah is a dermatologist, which makes her pretty trustworthy, she has been a dermatologist for over 10 years, and she’s been guest blogging abour Skin Health and Wellness since 2012. She covers a wide array of skincare topics, from acne to aging, skin cancer to psoriasis, and diet to dry skin. She also evaluates all kinds of skincare treatments, both lab-made and all-natural.