Good (Skin) Days Cs The Day Serum Review

Good (Skin) Days Cs The Day Serum
5.1
/ 10
Moisturizing
10.0 Humectancy icon Humectancy
0.2 Occlusivity icon Occlusivity
2.4Anti-wrinkle icon/ 10
Anti-wrinkle
Rich
in Antioxidants
Review

Does Good (Skin) Days Cs The Day Serum Work?

 
According to CreamScan AI's analysis of the ingredient list, here’s what Good (Skin) Days Cs The Day Serum has to offer:
 
  • Strong humectant moisturizing. This lightweight, humectant-rich product, ideal for oily skin, has a moisturizing rating of 5.1 out of 10.
  • Modest anti-wrinkle efficacy: Good (Skin) Days Cs The Day Serum has an anti-wrinkle rating of 2.4 out of 10 so you may expect some, although limited, effect on wrinkles.
  • Antioxidant protection.

Key Benefits of Good (Skin) Days Cs The Day Serum

 
These are the key benefits you can expect from using Good (Skin) Days Cs The Day Serum:
 

Lightweight Humectant Moisturizer Ideal for Oily Skin

According to CreamScan analysis, Good (Skin) Days Cs The Day Serum is quite moisturizing, with a moisturizing rating of 5.1 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a low occlusivity of 0.2 out of 10 and a maximum humectancy of 10 out of 10, primarily due to the high content of Butylene Glycol (est. ≈6.0%) and Glycerin (est. ≈3.0%).

This humectant-rich product, when used alone as a moisturizer, is ideal for oily skin, offering significant hydration in a lightweight, fast-absorbing formula with a minimal amount of occlusive ingredients.

It’s also a great choice for people with normal skin who prefer lightweight moisturizers.

A Humectant Boost for Any Skincare Routine

But it’s not limited to oily skin - such a humectant boost will also positively contribute to the moisturizing efficacy of any skincare routine when used as a step before applying the main moisturizer. This type of formulation is typically used in serums, where a light, fast-absorbing texture is key.

Please refer to the Ratings section below for details of the moisturizing rating calculation.

Modest Anti-Wrinkle Efficacy

According to CreamScan analysis, Good (Skin) Days Cs The Day Serum has a modest level of anti-wrinkle efficacy, rated 2.4 out of 10.

It contains 2 active ingredients with proven anti-wrinkle efficacy:

  • Ascorbic Acid (est. ≈4.0%),
     or Vitamin C, a popular ingredient, yet with moderate anti-wrinkle efficacy, as confirmed by a single clinical study involving 20 participants (Humbert et al.). This study showed that a cream with a relatively high concentration of 5% ascorbic acid reduced the average wrinkle depth by 7% after 6 months of use, compared to a vehicle (the same formulation without ascorbic acid).
  • Niacinamide (est. ≈0.3%),
     one of the most effective and well-researched anti-wrinkle ingredients. A clinical study involving 30 participants (Kawada et al.) confirmed that a cream with 4% niacinamide reduced the average depth of wrinkles around the eyes by 9% after 8 weeks of use, compared to a vehicle (the same formulation without niacinamide).
Among others, Good (Skin) Days Cs The Day Serum also contains contains Magnesium Ascorbyl Phosphate and Adenosine, two ingredients often marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of these ingredients provide insufficient evidence of efficacy according to CreamScan Research Evaluation Standards. Therefore, these ingredients do not contribute to the anti-wrinkle rating.
 
Moisturizers, when used regularly, are proven to prevent wrinkle formation and even reduce existing wrinkles. Therefore, this product, like any other moisturizer, can deliver some anti-wrinkle effects through its moisturizing action.
 

Please refer to the Ratings section below for details of the anti-wrinkle rating calculation.

Rich in Skin-Protecting Antioxidants

We estimate that Good (Skin) Days Cs The Day Serum is rich (> 3%) in antioxidants, specifically Ascorbic Acid (est. ≈4.0%).

A key benefit of antioxidants is their ability to reduce oxidative stress caused by free radicals and therefore prevent accelerated skin aging. Studies also show that antioxidants can protect against environmental damage such as UV radiation and pollution, and help reduce inflammation and skin redness.

Please note that this is not a complete list of benefits. We are in the process of enhancing our AI model to incorporate anti-pigmentation, exfoliation and anti-acne ratings.

Pros & Cons of Good (Skin) Days Cs The Day Serum

 
Here’s an overview of the pros and cons of Good (Skin) Days Cs The Day Serum to help you decide if it’s the right choice for your skincare routine:
 

Pros:

  • Humectant-rich moisturizing ideal for oily skin
  • Lightweight texture
  • A humectant moisturizing boost for any skincare routine
  • Offers modest anti-wrinkle efficacy
  • Rich in antioxidants that combat oxidative stress associated with accelerated skin aging and defend against environmental damage such as UV radiation and pollution

Cons: 

Ingredients

Est. % Ingredient Origin Functions
75
6
4
3
2
1.5
1.3
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Butylene Glycol
Function:
Origin:
Ascorbic Acid
Function:
Origin:
Glycerin
Function:
Origin:
1,2-Hexanediol
Function:
Origin:
Sodium Bicarbonate
Function:
Origin:
Myrciaria Dubia Fruit Extract
Function:
Origin:
Glycyrrhiza Glabra (Licorice) Root Extract
Function:
Origin:
Niacinamide
Function:
Origin:
Magnesium Ascorbyl Phosphate
Function:
Origin:
Arbutin
Function:
Origin:
Tocopheryl Acetate
Function:
Origin:
Coptis Japonica Extract
Function:
Origin:
Panax Ginseng Berry Extract
Function:
Origin:
Crocus Sativus Flower Extract
Function:
Origin:
Tuber Magnatum Extract
Function:
Origin:
Hibiscus Sabdariffa Flower Extract
Function:
Origin:
Theobroma Cacao (Cocoa) Extract
Function:
Origin:
Glycereth-25 PCA Isostearate
Function:
Origin:
Hydroxydecyl Ubiquinone
Function:
Origin:
Sodium Metabisulfite
Function:
Origin:
Xanthan Gum
Function:
Origin:
Ethylhexylglycerin
Function:
Origin:
Adenosine
Function:
Origin:
Dextrin
Function:
Origin:
Caprylic/Capric Triglyceride
Function:
Origin:
Cetyl Ethylhexanoate
Function:
Origin:
Hydrogenated Lecithin
Function:
Origin:

Ratings

All humectants
10.6
6
3
1
0.3
0.3
Benchmark
10
All occlusives
0.3
0.3
Benchmark
20
Moisturizing rating
5.1
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 10.6 10
10.0
6
3
1
0.3
0.3
Occlusivity All occlusives 0.3 20
0.2
0.3
Moisturizing rating
5.1
Ingredient Est. % Benchmark Humectancy
6
3
1
0.3
0.3
All humectants 10.6 10
10
All humectants
10.6
6
3
1
0.3
0.3
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
0.3
All occlusives 0.3 20
0.2
All occlusives
0.3
0.3
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
2.5 /10 5 4 2
6 /10 4 0.3 0.4
n/a
- 0.3 -
n/a
- 0.3 -
Total
2.4
Ascorbic Acid
2
Ingredient anti-wrinkle power
2.5 /10
when present at, %
5
in this formula, est. %
4
Niacinamide
0.4
Ingredient anti-wrinkle power
6 /10
when present at, %
4
in this formula, est. %
0.3
Magnesium Ascorbyl Phosphate
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Adenosine
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Anti-wrinkle rating
2.4
Ingredient Est. % Benchmark
Rich in Antioxidants
4
1.3
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
All antioxidants 8.7 3 Rich in antioxidants
All antioxidants
8.7
Ascorbic Acid
4
Myrciaria Dubia Fruit Extract
1.3
Glycyrrhiza Glabra (Licorice) Root Extract
1
Niacinamide
0.3
Magnesium Ascorbyl Phosphate
0.3
Arbutin
0.3
Tocopheryl Acetate
0.3
Hibiscus Sabdariffa Flower Extract
0.3
Theobroma Cacao (Cocoa) Extract
0.3
Hydroxydecyl Ubiquinone
0.3
Sodium Metabisulfite
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
1
0.3
All soothing 1.3 5 No
All soothing
1.3
1
0.3
Benchmark
5

Ingredients explained

Water
Est. %75
Function
Origin
WaterThe most used ingredient in skincare. Its concentration defines the product texture: rich creams may have about 50% of water while a light jelly about 90%. Water doesn’t moisturize the skin by itself and is used in skincare as a solvent for other ingredients.
Butylene Glycol
Est. %6
Function
Origin
Butylene Glycol

A clear, colorless liquid humectant that draws moisture to the skin. The humectancy of butylene glycol, owed to its two hydroxyl groups, is quite considerable, although not as powerful as glycerin, which contains three hydroxyl groups.

Ascorbic Acid
Est. %4
Function
Origin
Ascorbic Acid

Also known as vitamin C, this multi-benefit ingredient has proven anti-wrinkle, antioxidant, and anti-pigmentation efficacy. It degrades easily when exposed to air and light, so it requires proper packaging to maintain its stability.

Glycerin
Est. %3
Function
Origin
Glycerin

The most popular moisturizing ingredient in the world. It is a powerful humectant – cheap yet very effective.

1,2-Hexanediol
Est. %2
Function
Origin
1,2-HexanediolA multi-functional formula helper. It is a well-studied preservtive against bacteria and can help pigments and fragrances disperse evenly in a formula.
Sodium Bicarbonate
Est. %1.5
Function
Origin
Sodium BicarbonateA sodium salt that increases pH and removes dead skin cells.
Myrciaria Dubia Fruit Extract
Est. %1.3
Function
Origin
Myrciaria Dubia Fruit ExtractAn extract obtained from the berry pulp of the camu camu bushy tree, which boasts a uniquely high concentration of vitamin C. The extract also contains emollient fatty acids and moisturizing amino acids.
Glycyrrhiza Glabra (Licorice) Root Extract
Est. %1
Function
Origin
Glycyrrhiza Glabra (Licorice) Root ExtractAn extract from the licorice root. It contains a well-researched anti-inflammatory compound called glycyrrhizin that can reduce inflammation. Licorice root extract is also used for its powerful antioxidant effects and ability to treat pigmentation.
Niacinamide
Est. %0.3
Function
Origin
Niacinamide

Also known as vitamin B3, this ingredient is a true superstar with confirmed moisturizing, anti-acne, hyperpigmentation, and antioxidant benefits. Two studies confirm its significant anti-wrinkle efficacy.

Magnesium Ascorbyl Phosphate
Est. %0.3
Function
Origin
Magnesium Ascorbyl PhosphateOne of the best-researched derivatives of vitamin C. It is more resistant to light and air and retains all the properties of ascorbic acid – antioxidant, collagen-boosting, and anti-pigmentation, but with less irritation.
Arbutin
Est. %0.3
Function
Origin
ArbutinOne of the few potent anti-pigment compounds found naturally in bearberry or cranberry leaves. When applied to the skin, this ingredient converts into hydroquinone, with tyrosinase inhibiting effects.
Tocopheryl Acetate
Est. %0.3
Function
Origin
Tocopheryl Acetate

An antioxidant derivative of tocopherol (vitamin E). It helps to protect cells from free radicals and UV damage through the conversion to active vitamin E in the skin. It is more stable than tocopherol.

Coptis Japonica Extract
Est. %0.3
Function
Origin
Coptis Japonica Extract
Panax Ginseng Berry Extract
Est. %0.3
Function
Origin
Panax Ginseng Berry Extract
Crocus Sativus Flower Extract
Est. %0.3
Function
Origin
Crocus Sativus Flower Extract
Tuber Magnatum Extract
Est. %0.3
Function
Origin
Tuber Magnatum Extract
Hibiscus Sabdariffa Flower Extract
Est. %0.3
Function
Origin
Hibiscus Sabdariffa Flower ExtractDerived from bright red hibiscus flowers, this extract contains anthocyanins (red plant pigments), antioxidant flavonoids, and high amounts of organic acids.
Theobroma Cacao (Cocoa) Extract
Est. %0.3
Function
Origin
Theobroma Cacao (Cocoa) Extract

An extract from cocoa beans or cocoa powder with lots of beneficial compounds such as stimulant caffeine, antioxidant and astringent flavanols, and tannins – which are responsible for its bitter taste.

Glycereth-25 PCA Isostearate
Est. %0.3
Function
Origin
Glycereth-25 PCA Isostearate
Hydroxydecyl Ubiquinone
Est. %0.3
Function
Origin
Hydroxydecyl Ubiquinone
Sodium Metabisulfite
Est. %0.3
Function
Origin
Sodium MetabisulfiteA preservative that is especially effective at preventing fungus and mold growth. It is normally combined with a strong bactericidal preservative in order to achieve broad-spectrum protection. Sodium metabisulfite is also used as an antioxidant.
Xanthan Gum
Est. %0.3
Function
Origin
Xanthan GumA natural multi-functional ingredient that originates from fermented sugars. Xanthan gum acts as a viscosity-building agent to thicken skincare products. It is also an excellent stabilizer and works well to hold other ingredients together.
Ethylhexylglycerin
Est. %0.3
Function
Origin
EthylhexylglycerinA preservative booster derived from glycerin. It is commonly paired with other preservatives to improve their efficacy. Ethylhexylglycerin is also a humectant due to its chemical base of glycerin.
Adenosine
Est. %0.3
Function
Origin
Adenosine

A key molecule responsible for energy transportation, signaling, and enzyme activity. Adenosine is a popular anti-wrinkle ingredient, however, the key study about its anti-wrinkle efficacy (1) does not meet CreamScan Research Evaluation Standards as it is not double-blind.

Dextrin
Est. %0.3
Function
Origin
DextrinA partially hydrolyzed potato starch, most commonly used as a viscosity controlling and binding agent. When dispersed into water, it can create textures ranging from a thick paste to a soft gel.
Caprylic/Capric Triglyceride
Est. %0.3
Function
Origin
Caprylic/Capric TriglycerideA natural occlusive moisturizing and emollient ingredient, it is a blend of glycerin and two fatty acids, caprylic and capric acid. It creates an oil-based protective layer on the skin, thereby preventing water loss.
Cetyl Ethylhexanoate
Est. %0.3
Function
Origin
Cetyl EthylhexanoateA clear, pale yellow liquid, that functions as an emollient and a solvent, meaning that it is useful for dissolving oil-soluble ingredients.
Hydrogenated Lecithin
Est. %0.3
Function
Origin
Hydrogenated LecithinA version of plain lecithin that has been saturated with hydrogen atoms. This ingredient can be derived from plants, like soy or sunflower, from egg yolks, or made synthetically. Its major function is to emulsify water and oils.