Guinot Newhite Vitamin C Brightening Serum

Guinot Newhite Vitamin C Brightening Serum
4.5
/ 10
Moisturizing
8.1 Humectancy icon Humectancy
0.9 Occlusivity icon Occlusivity
2.4Anti-wrinkle icon/ 10
Anti-wrinkle
Rich
in Antioxidants
$$$$

Review

Results you may expect from using Guinot Newhite Vitamin C Brightening Serum:

Based on the ingredient analysis by CreamScan, these are the key benefits you can expect from using Guinot Newhite Vitamin C Brightening Serum:

  • Moderate moisturizing. It has a moisturizing rating of 4.5 out of 10.
  • Some anti-wrinkle efficacy: Guinot Newhite Vitamin C Brightening Serum has an anti-wrinkle rating of 2.4 out of 10 so you may expect some, although limited, effect on wrinkles.
  • Antioxidant protection.

How moisturizing is it?

Quite moisturizing: Guinot Newhite Vitamin C Brightening Serum has a moisturizing rating of 4.5 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a low occlusivity of 0.9 out of 10 and a very high humectancy of 8.1 out of 10, primarily due to the high content of Glycerin (est. ≈2.0%).

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

Anti-wrinkle efficacy

According to CreamScan analysis, Guinot Newhite Vitamin C Brightening Serum has a slight anti-wrinkle rating of 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 anti-wrinkle ingredient, yet with average efficacy confirmed by only one study.
  • Niacinamide (est. ≈0.3%),
     one of the most effective and well-researched anti-wrinkle ingredients.
Among others, Guinot Newhite Vitamin C Brightening Serum also contains contains Adenosine and Folic Acid, two ingredients 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, could deliver additional anti-wrinkle efficacy through its moisturizing action.
 

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

Antioxidant benefits

We estimate that Guinot Newhite Vitamin C Brightening 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.

Ingredients

Est. % Ingredient Origin Functions
60
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
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
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
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
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Ratings

All humectants
8.1
2
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
Benchmark
10
All occlusives
1.8
1.5
0.3
Benchmark
20
Moisturizing rating
4.5
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 8.1 10
8.1
2
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
Occlusivity All occlusives 1.8 20
0.9
1.5
0.3
Moisturizing rating
4.5
Ingredient Est. % Benchmark Humectancy
2
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
All humectants 8.1 10
8.1
All humectants
8.1
2
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
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
1.5
0.3
All occlusives 1.8 20
0.9
All occlusives
1.8
1.5
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
Adenosine
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Folic Acid
-
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
0.3
0.3
0.3
0.3
0.3
0.3
All antioxidants 5.8 3 Rich in antioxidants
All antioxidants
5.8
Ascorbic Acid
4
Niacinamide
0.3
Tocopheryl Acetate
0.3
Cysteine
0.3
Glutathione
0.3
Riboflavin
0.3
Tocopherol
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
0.3
0.3
All soothing 0.6 5 No
All soothing
0.6
0.3
0.3
Benchmark
5

Ingredients explained

Water
Est. %60
Function
Origin
The 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.
Isononyl Isononanoate
Est. %6
Function
Origin
An ester of a branched fatty acid with a branched fatty alcohol. It is an easily spreadable emollient that has a silky, dry, non-greasy feel on the skin.
Ascorbic Acid
Est. %4
Function
Origin

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.

Caprylic/Capric/Succinic Triglyceride
Est. %3
Function
Origin
Description is coming soon
Glycerin
Est. %2
Function
Origin

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

Dimethicone
Est. %1.5
Function
Origin
The most common silicone in skincare. It forms a silky, smooth film on the skin’s surface and can help to prevent water loss. It also aids in wound healing and can treat and soften scars. Dimethicone is considered to be very safe for use.
Polysorbate 60
Est. %1.3
Function
Origin
An ester based on sorbitan. It is good for emulsifying water and oils together – specifically making oil-in-water emulsions. Polysorbate 60 is also said to give a product a notable fragrance.
Pentylene Glycol
Est. %1
Function
Origin
A naturally or synthetically derived preservative that exhibits effective antifungal and antibacterial traits. It also acts as a booster for more traditional preservatives. Pentylene glycol can also serve as a moisturizing humectant and solvent.
Arachidyl Alcohol
Est. %0.3
Function
Origin
A non-drying fatty alcohol that functions as an emollient, emulsion stabilizer, and viscosity controlling agent. It also produces a mattifying effect when applied in a skincare product onto the skin.
Behenyl Alcohol
Est. %0.3
Function
Origin
A fatty alcohol with emollient properties. It is used as a co-emulsifier and thickener and tends to result in a product with a smooth and creamy application texture.
Ethylhexylglycerin
Est. %0.3
Function
Origin
A 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.
Tocopheryl Acetate
Est. %0.3
Function
Origin
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.
Arachidyl Glucoside
Est. %0.3
Function
Origin
A mild cleanser and emulsifier that helps oil and water to mix and form emulsions.
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Est. %0.3
Function
Origin
An emulsion stabilizer and thickener that helps to create a pleasant, satiny, and light formula texture. It works by forming a gel-like network within water or oil, which both stabilizes other ingredients and produces a thickening effect.
Butylene Glycol
Est. %0.3
Function
Origin
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.
Fragrance
Est. %0.3
Function
Origin
Under trade secret law, manufacturers have the right not to disclose what exactly went into the fragrance and use the unspecific word Fragrance or Parfum instead. Many fragrances are highly allergenic.
Isohexadecane
Est. %0.3
Function
Origin
A clear, colorless liquid that is commonly used as an emollient. It is made up of pure hydrocarbons and leaves a dry feeling on the skin upon application. It also increases the spreadability of a product.
Cellulose Gum
Est. %0.3
Function
Origin
A polymer that is derived from its namesake, cellulose, which is plant-based. It has many formula-helper benefits, including thickening and product stabilization.
Xanthan Gum
Est. %0.3
Function
Origin
A 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.
Chlorhexidine Digluconate
Est. %0.3
Function
Origin
A synthetic antimicrobial ingredient used to deal with bacterial and fungal skin infections. In the same way that it wipes out bacteria from the skin, it can also fight them inside cosmetic products, acting as a preservative.
Disodium EDTA
Est. %0.3
Function
Origin
A synthetic chelator that helps to maintain the look and smell of a product by 'locking up' troublesome metal ions.
Sodium Chloride
Est. %0.3
Function
Origin
You’re definitely familiar with sodium chloride, even if you don’t think you are. It’s table salt! Salt works well with some cleansing ingredients (surfactants) to thicken them into gels. It also acts as a stabilizer for water-in-oil emulsions.
Sorbitan Isostearate
Est. %0.3
Function
Origin
A mild yet powerful emulsifier primarily utilized to produce water-in-oil emulsions. It helps to create a particularly rich and substantial emulsion.
Linalool
Est. %0.3
Function
Origin
A fragrant, volatile compound naturally present in many essential oils. It has a pleasant scent and is often used in skincare products as a fragrance. People with sensitive skin should try to avoid it, or at least do a patch test before using it.
Hydrolyzed Vegetable Protein
Est. %0.3
Function
Origin
A blanket term used for plant-based proteins that have been processed into smaller chunks. They add to the skincare product's film-forming and water-binding properties.
Geraniol
Est. %0.3
Function
Origin
A fragrant, volatile, plant-based, liquid chemical that can be naturally found in many essential oils (specifically rose, palmarosa, citronella). It has a rose-like scent. It is a potential irritant and may cause an allergic reaction in some people.
Citronellol
Est. %0.3
Function
Origin
A fragrant compound found naturally in many essential oils (mainly lemongrass). It can have a lemon or a rose scent. People with sensitive skin should try to avoid products with citronellol, or at least do a patch test before using it.
Glucose
Est. %0.3
Function
Origin
A simple sugar that is also one of two components of sucrose, or table sugar. It is used as a humectant in skincare products. Glucose is also used to flavor lip care cosmetics because of its mildly sweet taste.
Alpha-Isomethyl Ionone
Est. %0.3
Function
Origin
A fragrance ingredient that is supplied as a pale, yellow liquid. The scent it emits is very clean and features notes of violet and orris. Alpha-isomethyl is also used as a flavoring agent in lip care products and even in some foods and drinks.
Potassium Chloride
Est. %0.3
Function
Origin
A salt of hydrochloric acid that stabilizes emulsions through thickening.
Calcium Chloride
Est. %0.3
Function
Origin
A salt that can stabilize emulsions through thickening. It also serves as an astringent.
Glutamic Acid
Est. %0.3
Function
Origin
A non-essential amino acid that serves as a building block for all proteins in the body. It is a moisturizing humectant and a part of the skin's Natural Moisturizing Factor, a mixture of amino acids in skin cells that keeps them hydrated.
Magnesium Sulfate
Est. %0.3
Function
Origin
A naturally occurring mineral that is commonly used in skincare products as a bulking agent. It helps to control the viscosity of products by making them thicker.
Sodium Phosphate
Est. %0.3
Function
Origin
A sodium salt of phosphoric acid that increases pH.
Glutamine
Est. %0.3
Function
Origin
A humectant moisturizing amino acid that, aside from attracting water to the skin’s surface, can also soothe allergic itching and reduce the signs of inflammation.
Lysine HCl
Est. %0.3
Function
Origin
Lysine HCl is a chloride salt of lysine, an essential, slightly alkaline amino acid. It has the same function as the non-salt version - it is a humectant moisturizing and emollient ingredient that, due to its sometimes undesirable aroma, is not often used.
Arginine
Est. %0.3
Function
Origin
A humectant amino acid used to attract water to the skin’s surface. It is a part of the skin's Natural Moisturizing Factor, a mixture of various compounds that keeps the skin’s surface well hydrated. Arginine can also be used as a pH adjuster.
Leucine
Est. %0.3
Function
Origin
A humectant moisturizing amino acid that is a part of the skin's Natural Moisturizing Factor. It helps to increase water content on the skin’s surface and is often used in conjunction with anti-pigmentation products.
Alanine
Est. %0.3
Function
Origin
A simple amino acid used in skincare as a humectant moisturizing ingredient. It is a part of the so-called Natural Moisturizing Factor, a complex mixture of free amino acids and other water-soluble compounds found in skin cells.
Glycine
Est. %0.3
Function
Origin
A humectant moisturizing amino acid that is a part of skin's Natural Moisturizing Factor. Some recent studies suggest that it may have barrier repair properties.
Potassium Nitrate
Est. %0.3
Function
Origin
Description is coming soon
Sodium Acetate
Est. %0.3
Function
Origin
A sodium salt that can increase the basicity of a product.
Sodium Sulfate
Est. %0.3
Function
Origin
An inorganic sodium salt that provides volume and thickens emulsions.
Valine
Est. %0.3
Function
Origin
An essential amino acid (meaning our body cannot make it on its own and we get it from food instead). Like some other amino acids, Valine is a part of the skin's Natural Moisturizing Factor.
Proline
Est. %0.3
Function
Origin
The best humectant moisturizer of all the amino acids. It is a part of the skin's Natural Moisturizing Factor and increases hydration in the top layers of the skin. It also has antioxidant activity and helps to heal damaged skin.
Tyrosine
Est. %0.3
Function
Origin
Description is coming soon
Aspartic Acid
Est. %0.3
Function
Origin
A humectant moisturizing amino acid that is a part of the skin's Natural Moisturizing Factor. It helps to retain water on the skin’s surface and is slightly acidic, thereby helping to balance the pH of a skincare product.
Methionine
Est. %0.3
Function
Origin
Methionine is a sulfur-containing amino acid that is a part of all the proteins in the body. It supports hair growth, but other than that there isn't much information about its functions in personal care products.
Threonine
Est. %0.3
Function
Origin
An essential amino acid that may play a role in collagen production. However, more research is needed in order to confirm or deny these claims.
Adenine
Est. %0.3
Function
Origin
Description is coming soon
Phenylalanine
Est. %0.3
Function
Origin
An essential amino acid used in the treatment of vitiligo and other pigmentation issues. It is considered less effective than other anti-pigment ingredients and is often used in combination with them.
Serine
Est. %0.3
Function
Origin
A non-essential amino acid, meaning that our body can produce it. It is the largest constituent of the skin's Natural Moisturizing Factor and is used in skincare as a humectant moisturizing ingredient.
Histidine
Est. %0.3
Function
Origin
A humectant moisturizing amino acid with weak antioxidant effects that is a part of the skin’s Natural Moisturizing Factor. It can attract water to the skin’s surface and is slightly alkaline, thereby helping to balance a product's pH.
Isoleucine
Est. %0.3
Function
Origin
A humectant moisturizing, essential amino acid that is a part of the skin's Natural Moisturizing Factor. It helps to increase water content on the skin’s surface and can increase the barrier repair effects of ceramides.
Hydroxyproline
Est. %0.3
Function
Origin
An amino acid that may promote collagen synthesis.
Tryptophan
Est. %0.3
Function
Origin
Description is coming soon
Cysteine
Est. %0.3
Function
Origin
A multifunctional amino acid that acts as a reducing agent and an antioxidant.
Disodium Adenosine Triphosphate
Est. %0.3
Function
Origin
Description is coming soon
DNA
Est. %0.3
Function
Origin
Description is coming soon
RNA
Est. %0.3
Function
Origin
Description is coming soon
Cholesterol
Est. %0.3
Function
Origin
An emollient and important barrier repairing lipid, effective when combined with fatty acids and ceramides. Around 25% of the skin’s lipid layer is made up of cholesterol and it is found in the membrane of every single cell in our body.
Disodium Adenosine Phosphate
Est. %0.3
Function
Origin
Description is coming soon
Adenosine
Est. %0.3
Function
Origin

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.

Biotin
Est. %0.3
Function
Origin
Biotin is an important nutrient that can cause weak hair and nails if deficient. Unfortunately, while biotin supplements have promising studies, topical biotin in creams and serums doesn’t have a large body of evidence to support its use.
Calcium Pantothenate
Est. %0.3
Function
Origin
A vitamin B5 derivative that reduces static buildup on the skin.
Cytosine
Est. %0.3
Function
Origin
Description is coming soon
Ethyl Linoleate
Est. %0.3
Function
Origin
Description is coming soon
Ethyl Linolenate
Est. %0.3
Function
Origin
Description is coming soon
Ethyl Oleate
Est. %0.3
Function
Origin
An emollient derived from oleic acid that sits on top of the skin and leaves it soft, shiny, and glossy. It has a faint floral scent.
Folic Acid
Est. %0.3
Function
Origin
A critical vitamin for the body that needs more research for topical applications.
Glutathione
Est. %0.3
Function
Origin
A naturally occurring tripeptide that combats free radicals and acts as a reducing agent.
Guanine
Est. %0.3
Function
Origin
Description is coming soon
Inositol
Est. %0.3
Function
Origin
A humectant moisturizing, sugar-like compound that is present in all the cells of the body, but especially the brain. It is manufactured from sugar beets or carob tree pods for skincare purposes.
Niacin
Est. %0.3
Function
Origin
An active form of vitamin B3 that is used to support and restore the healthy appearance of the skin, although it is less effective than Niacinamide.
Niacinamide
Est. %0.3
Function
Origin

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.

Pyridoxine HCl
Est. %0.3
Function
Origin
A B-vitamin that helps regulate sebum production.
Riboflavin
Est. %0.3
Function
Origin
Riboflavin, also known as Vitamin B2, is used in skincare as a coloring agent due to its bright, brilliant orange-yellow color. The research shows that it is a good antioxidant and can protect the skin from UV-induced damage.
Thiamine HCl
Est. %0.3
Function
Origin
Also known as vitamin B1, the benefits of this ingredient in skincare are not yet clear. It may have some benefits to energy metabolism, but this hasn't been confirmed. It has a typical, sulfur-like smell.
Thymine
Est. %0.3
Function
Origin
Description is coming soon
Tocopherol
Est. %0.3
Function
Origin
Simply another name for vitamin E. Tocopherol is a fantastic ingredient and especially beneficial for dry and inflamed skin. It has occlusive moisturizing, emollient, antioxidant, and photoprotective properties.
Uracil
Est. %0.3
Function
Origin
Description is coming soon
Xanthine
Est. %0.3
Function
Origin
Description is coming soon