When To Use Vitamin C Serum? — COUI Skincare

When To Use Vitamin C Serum?

There are a considerable number of top quality serums available on the market, and these serums are tremendously beneficial for skin. Such products have very minimal side effects if you purchase a good quality product and don’t have any previous skin conditions.

Vitamin C serums are equipped with various capabilities that prevent your skin from developing any pigments and can enhance its moisture and hydration. In addition to that, these serums also lower inflammation and improve the healing process while preventing your skin from issues like acne, dark circles, and wrinkles.

Vitamin C can be used for all types of skin except for sensitive skins. The serum is comprised of natural ingredients that are brought together by a concentrated formula to transform your skin. These serums energize your skin along with preserving its moisture.

baby skin

Vitamin C is used in most anti-aging products because aging effects can be resisted with the help of this vitamin. Vitamin C brightens up your skin and makes you look younger after consistent use. It can be used with the combination of sunscreen for protecting your skin from the ultraviolet radiation of the sun and various other environmental toxins.

These serums are suitable for any age, and you can use it at any time of the day as well. People with sensitive skin can also use it. However, if your skin begins to feel irritated then stop using it immediately.

When to use vitamin C serum?

There is no specific timing associated to use this serum, and you can use it either at day or night. However, if you want the best results, then you can use it after your cleansing lotion. You can also use it before applying your makeup for longer-lasting beauty.

At night, you can use the serum before applying moisturizer. Ultraviolet radiation from the sun is dangerous for your skin and to protect your skin from it you should use a vitamin C serum before applying any sunblock during the day.

Can I use vitamin C serum twice a day?

There are plenty of serums available on the market, and most of them have vitamin C in them. You can use these serums twice a day before applying your sunblock in the day and before applying your moisturizer at night.

The best way to use these serums is in a small quantity; however, you can alter the amount based on your skin type. Please keep one thing in mind that for improved and quicker results, you should use it before applying your makeup and integrate it into your daily routine.

Vitamin C Serum Side Effects

Vitamin C serums are best for almost any type of skin, and they can cure many skin issues as well. However, some of you might face some problems. Some of the side effects associated with using this serum include irritation.

Irritation is most common with people who have sensitive skin. If you have dehydrated skin, then you might also feel some irritation if you use this serum. If you are dealing with regular irritations with frequent use of these serums, then stop using it all together.

irritation skin

The second most troubling issue is that vitamin C serum is not helpful for all types of acne because acne also varies according to skin type. Most of the vitamin C serums have Ferulic acid. Large quantities of this acid are not suitable for your skin, and it can negatively impact fine lines as well.

The reason behind this is that Ferulic acid is in the serum to make the serum stay longer on the skin, and it can cause prolonged irritations as well. Therefore you must check the content of Ferulic acid in your serum before buying it.

How often to use vitamin C serum?

Vitamin C serum can work well to clean the pollutants off your skin and protect it from UV radiations. You should use vitamin C serum before applying any toner or cleanser on your face during your daily routine. You can use it twice a day for better outcomes if your skin allows it.

Using a vitamin C serum combined with your sunblock in the morning and moisturizer at night won't harm your skin. In fact, it will keep your skin well protected from antioxidants and will also help in improving your skin tone. In addition to that, your skin will brighten up and make your skin look young. Vitamin C can serve well as an exfoliant and promotes the production of collagen.

Best Vitamin C Serum

For protecting your skin against UVA and UVB radiations and repair any damaged skin cells, vitamin C serum can be very useful. It lowers hyper-pigmentation and cleans out the dead cells for a clearer complexion.

These serums also have ingredients that help your skin become strong and prevent it from harsh weather. In addition to that, these serums can also reduce the amount of inflammation and give you a fresh appearance. Some of the renowned vitamin C serums have high contents of vitamin C in them, and it increases their shelf life. The prices vary according to the brand and the formula that they use.

super c serum

Some popular serums include SkinCeuticals C E Ferulic, Serumtologie C Serum 22, Klair's Vitamin C Serum, COUI Super C Serum, Cosmetic Skin Solution Vitamin C Serum, and COUI Natural Vitamin C Serum.

What is the best vitamin C concentration level to use?

You should use vitamin C serums according to the concentration level of the vitamin C in it. It is one of the essential ingredients in such a serum. The more vitamin C in a serum means that it will have a longer shelf life. Moreover, different concentration levels can cause irritations for different skin types as well. Most of vitamin C serums come with ten percent concentration.

Hence, the serums with high concentrations can deliver excellent results and will also last longer as compared to serums with lower vitamin C content. However, the only drawback of serum with high vitamin C concentration will also cause more irritations as compared to serums with low potency.

Can I store vitamin C serum in the fridge?

Most of the serums have ingredients that make them vulnerable to sunlight and heat. Vitamin C itself is also vulnerable when it is placed in the heat or direct sunlight. Therefore, you should keep these products in a cool and dry place. Refrigerators are your best options for storing vitamin C serums.

store serum in fridge

The primary reason to keep it refrigerated is that it can automatically change its composition as well as the potencies which can alter its working and outcomes. Don’t keep your serum bottle in your bathroom because of the changes in temperature can alter the concentration levels as well.

Do not keep the bottle of serum in the bathroom due to humidity and variation in temperature. If you have purchased a large bottle of this serum, then split it into smaller containers to improve its shelf life.

Why should you use vitamin C serums?

Vitamin C is beneficial for your skin for many reasons. Protein is a crucial element that is used for the development of these serums because it maintains your skin softness and makes you look younger.

In addition to that, you will also get firmer and healthier skin. By using it regularly, it will slow the effects of aging and will diminish the wrinkles on your face. It will also protect your skin from harmful ultraviolet rays from the sun.

It is the best product for those people who have dark circles around their eyes. Vitamin C serum works on getting rid of dark spots, and lowers hyper-pigmentation as well as discoloration and improves the natural glow of your skin.

What is the shelf life of a vitamin C serum?

Generally, after opening a bottle of vitamin C serum, you can use that serum for three to four months. You should not use it for a longer duration if you leave it open.

If the color of the vitamin C serum changes to a dark brown color, it means the shelf life of it has ended; you should throw it out in this situation. That's why it is essential to keep your vitamin C serum bottle in the dark or cooler places.

How can I tell if my serum has gone bad?

There are plenty of conditions that indicate that your vitamin C serum has gone bad. The serum can transform its color with the passage of time if exposed to sunlight or heat. If your serum has changed its color, then you know that it's time to replace your serum.

sun heat

In addition to serums, vitamin C is also used in other products such as lotions, balms, and pastes. They also tend to change their color which means that it’s time to throw them away. However, in some cases, you can remove a portion of your lotion or balm from the top and use the rest of the product because the color only changes in the area that is exposed to the air.


Based on your skin type, there are very few restrictions on using vitamin C serums. However, you should use it twice a day and on a daily basis if your skin allows it. It is an excellent source of natural or herbal skin care that prevents your skin from dangerous chemicals that are applied to the skin such as makeup. You should use vitamin C serum after applying sunblock in the morning and before applying moisturizer at night.

Vitamin C serum has various features. It protects your skin from UVA or UVB radiation of the sun, works well on hyperpigmentation, reduces the effects of anti-aging, helps to reduce the effects of redness caused by sun rays and reduces wrinkles and acne marks or dark spots.

We have compiled all the relevant information on how to use vitamin C serum. We sincerely hope that you have found this information valuable.

Enjoy the glow!

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