facetheory Glow-C Vitamin C 20% Serum | Unbiased Skincare Efficacy Review by AI

Review

Does facetheory Glow-C Vitamin C 20% Serum Work?

According to CreamScan AI's analysis of the ingredient list, here’s what facetheory Glow-C Vitamin C 20% Serum has to offer:

Strong humectant moisturizing. This lightweight, humectant-rich product, ideal for oily skin, has a moisturizing rating of 5.0 out of 10.

Antioxidant protection.

Key Benefits of facetheory Glow-C Vitamin C 20% Serum

These are the key benefits you can expect from using facetheory Glow-C Vitamin C 20% Serum:

Lightweight Purely Humectant Moisturizing, Ideal for Oily Skin

According to CreamScan analysis, facetheory Glow-C Vitamin C 20% Serum is quite moisturizing, with a moisturizing rating of 5.0 out of 10.

Is it more humectant or occlusive? It is purely humectant. It has zero occlusivity (we didn't find any occlusive ingredients on the ingredient list) and a maximum humectancy of 10 out of 10, entirely due to the high content of Propanediol (est. ≈52.6%).

This humectant-rich product, when used alone as a moisturizer, is ideal for oily skin, providing significant hydration in a lightweight, fast-absorbing formula without any occlusive ingredients.

Tip: Certain studies suggest that humectants alone may not effectively moisturize the skin. If you use this product as your only moisturizer, we recommend following it with one that contains at least some occlusive ingredients.

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.

Rich in Skin-Protecting Antioxidants

We estimate that facetheory Glow-C Vitamin C 20% Serum is rich (> 3%) in antioxidants, specifically 3-O-Ethyl Ascorbic Acid (est. ≈20.0%) and Ferulic Acid (est. ≈3.4%).

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.

Things to Be Aware Of: facetheory Glow-C Vitamin C 20% Serum

CreamScan AI identified a few things to consider before adding facetheory Glow-C Vitamin C 20% Serum to your skincare routine:

If It’s Your Only Moisturizer, It Needs to Be Paired with Some Occlusives

While humectants are highly effective at attracting water to the skin, studies (J. N. Kraft, C. W. Lynde) suggest they may not be efficient when used alone.

One major drawback of purely humectant moisturization is that the water attracted by humectants to the upper layers of the skin can evaporate completely into the environment through transepidermal water loss (TEWL). Adding occlusive ingredients helps seal this moisture into the skin and prevent further water loss.

If you’re using facetheory Glow-C Vitamin C 20% Serum as your only moisturizer, consider pairing it with one that contains at least some occlusive ingredients, such as oils, butters, or silicones. These work alongside humectants to create a protective barrier, locking in hydration and ensuring longer-lasting moisturization. The amount of occlusive needed depends on your skin type - the drier the skin, the more occlusives it requires.

If this product is used not as a standalone moisturizer but as part of your skincare routine, such as a toner or serum, it should be applied before your main moisturizer (unless it's a sunscreen), which will provide the necessary occlusivity on top of it.

Questionable anti-wrinkle efficacy

If one of your main reasons for choosing facetheory Glow-C Vitamin C 20% Serum is its potential anti-aging effects, please note that, according to CreamScan analysis, it currently has a zero anti-wrinkle rating.

It contains 3-O-Ethyl Ascorbic Acid, an ingredient often marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of 3-O-Ethyl Ascorbic Acid provide insufficient evidence of its efficacy according to CreamScan Research Evaluation Standards.

While this does not categorically exclude the possibility that 3-O-Ethyl Ascorbic Acid may reduce wrinkles, its efficacy is not supported by convincing, vehicle-controlled, double-blind clinical studies - at least none that were accessible to the CreamScan team at the time of publication.

Therefore, this ingredient does not generate 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.

Pros & Cons of facetheory Glow-C Vitamin C 20% Serum

Here’s an overview of the pros and cons of facetheory Glow-C Vitamin C 20% Serum to help you decide if it’s the right choice for your skincare routine:

Pros:

When used alone: Provides humectant-rich moisturizing ideal for oily skin
As part of a routine: A humectant moisturizing boost, beneficial for any skin type
Lightweight texture

Rich in antioxidants that combat oxidative stress associated with accelerated skin aging and defend against environmental damage

Cons:

Only if used as a standalone moisturizer - it needs to be paired with occlusives to seal in humectants

Questionable anti-wrinkle efficacy

Preservative
Formula helpers

Other

Est. % The Estimated % is our algorithm-based assumption about an ingredient's concentration in a formula. Learn more The Estimated % is our algorithm-based assumption about an ingredient's concentration in a formula. Learn more	Ingredient	Origin	Functions
52.6	Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness. Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.	Botanical, Ingredients derived from plants, mosses, and lichens: extracts, oils, powders, juices and other types of processed plant materials. Botanical, Ingredients derived from plants, mosses, and lichens: extracts, oils, powders, juices and other types of processed plant materials. Biotech, The biotech origin of the ingredient implies that it was made in a lab using cultured microorganisms (bacteria or fungi) and a substrate (e.g. through the fermentation process), and then extracted and/or purified. Biotech, The biotech origin of the ingredient implies that it was made in a lab using cultured microorganisms (bacteria or fungi) and a substrate (e.g. through the fermentation process), and then extracted and/or purified. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.	Moisturizing (Humectant), Humectants are moisturizing ingredients that draw moisture to the skin, either from deeper layers or from the environment (when it's humid). Moisturizing (Humectant), Humectants are moisturizing ingredients that draw moisture to the skin, either from deeper layers or from the environment (when it's humid). Formula helper Solvent – a liquid that dissolves other ingredients. Viscosity controlling – changes the thickness of a product. Formula helper Solvent – a liquid that dissolves other ingredients. Viscosity controlling – changes the thickness of a product.
20 Verified concentration of an ingredient as indicated on its package, in the ingredient list, or on the official website. Verified concentration of an ingredient as indicated on its package, in the ingredient list, or on the official website.	3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits. 3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits.	Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.	Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Anti-Wrinkle, Anti-wrinkle ingredients prevent the formation or reduce the appearance of wrinkles. Anti-Wrinkle, Anti-wrinkle ingredients prevent the formation or reduce the appearance of wrinkles. Anti-Pigmentation Anti-pigmentation ingredients help to even skin tone by reducing the intensity of dark spots and hyperpigmentation. Anti-Pigmentation Anti-pigmentation ingredients help to even skin tone by reducing the intensity of dark spots and hyperpigmentation.
12.6	Olive Oil Polyglyceryl-4 Esters Olive Oil Polyglyceryl-4 Esters		Formula helper Solubilizing – helps ingredients dissolve. Formula helper Solubilizing – helps ingredients dissolve.
6.8	Dibutyl Lauroyl Glutamide Dibutyl Lauroyl Glutamide	Synthetic, All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic, All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Animal Ingredients derived from animals (including birds, fish, crustaceans, mollusks, and insects) or produced by animals (e.g. dairy- and egg-derived ingredients, bee products, silk, pearls, etc.) Animal Ingredients derived from animals (including birds, fish, crustaceans, mollusks, and insects) or produced by animals (e.g. dairy- and egg-derived ingredients, bee products, silk, pearls, etc.)	Formula helper Film-forming – creates a film to increase wear time. Formula helper Film-forming – creates a film to increase wear time.
4.6	Dibutyl Ethylhexanoyl Glutamide Dibutyl Ethylhexanoyl Glutamide
3.4	Ferulic Acid A plant-based phenolic acid with powerful and scientifically proven antioxidant properties. It enhances the effects of vitamins C and E, as well as the UV protective effects of sunscreens. Ferulic Acid A plant-based phenolic acid with powerful and scientifically proven antioxidant properties. It enhances the effects of vitamins C and E, as well as the UV protective effects of sunscreens.	Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.	Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antimicrobial, Antimicrobials prevent the growth of harmful microorganisms on the skin. Antimicrobial, Antimicrobials prevent the growth of harmful microorganisms on the skin. Preservative, Preservatives prevent the growth of bacteria and fungi in a product. Preservative, Preservatives prevent the growth of bacteria and fungi in a product. Formula helper Light stabilizing – absorbs UV light to protect ingredients. Formula helper Light stabilizing – absorbs UV light to protect ingredients.

52.6

Propanediol

Function:

Origin:

3-O-Ethyl Ascorbic Acid

Function:

Origin:

12.6

Olive Oil Polyglyceryl-4 Esters

Function:

Origin:

6.8

Dibutyl Lauroyl Glutamide

Function:

Origin:

4.6

Dibutyl Ethylhexanoyl Glutamide

Function:

Origin:

3.4

Ferulic Acid

Function:

Origin:

Ratings

Propanediol

52.6

Benchmark

None

Benchmark

Moisturizing rating

5.0

Ingredient		Est. %	Benchmark Sciense based points to which we compare all humectants and all occlusives in a product to calculate its Humectancy and Occlusivity. Sciense based points to which we compare all humectants and all occlusives in a product to calculate its Humectancy and Occlusivity.	Raiting
Humectancy	All humectants	52.6	10	10.0
	Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness. Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.	52.6
Occlusivity	All occlusives	0.0	20	0.0
	None
Moisturizing rating				5.0

Ingredient	Est. %	Benchmark According to various studies, a formula made up of 10% humectants will significantly increase skin hydration. Some studies also suggest that any further icrease in the consentration of humectants does not translate inty any more hydration and may even be dehydrating. To achieve maximum Humectancy, the product should have humectants with a total score of 10 and more. According to various studies, a formula made up of 10% humectants will significantly increase skin hydration. Some studies also suggest that any further icrease in the consentration of humectants does not translate inty any more hydration and may even be dehydrating. To achieve maximum Humectancy, the product should have humectants with a total score of 10 and more.	Humectancy
Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness. Propanediol An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.	52.6
All humectants	52.6	10	10

Propanediol

52.6

Benchmark

Ingredient	Est. %	Benchmark The most occlusive product possible is 100% petrolatum (hello Vaseline Jelly). According to studies, hovewer, even 10% petrolatum can achieve almost the same mosturizing effect. The occlusive properties of petrolatum are at least twice as superior as other occlusive ingredients. This is why, in order to match the moisturizing efficacy of 10% petrolatum, a product needs to contain at least 20% of other occlusives. Our benchmark for maximum Occlusivity is 20 (and the petrolatum score is always doubled). The most occlusive product possible is 100% petrolatum (hello Vaseline Jelly). According to studies, hovewer, even 10% petrolatum can achieve almost the same mosturizing effect. The occlusive properties of petrolatum are at least twice as superior as other occlusive ingredients. This is why, in order to match the moisturizing efficacy of 10% petrolatum, a product needs to contain at least 20% of other occlusives. Our benchmark for maximum Occlusivity is 20 (and the petrolatum score is always doubled).	Occlusivity
None
All occlusives	0.0	20	0.0

None

Benchmark

Ingredient	Ingredient anti-wrinkle power Shows on a scale of 0-10 how effective an ingredient is at reducing wrinkles. Both the Reported Efficacy of the ingredient and the Strength of Evidence are taken into account. Shows on a scale of 0-10 how effective an ingredient is at reducing wrinkles. Both the Reported Efficacy of the ingredient and the Strength of Evidence are taken into account.	when present at, %	in this formula est. %	Rating
3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits. 3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits.	n/a This ingredient is marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of this ingredient provide insufficient evidence of efficacy according to CreamScan Research Evaluation Standards. Therefore, this ingredient do not contribute to the anti-wrinkle rating. This ingredient is marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of this ingredient provide insufficient evidence of efficacy according to CreamScan Research Evaluation Standards. Therefore, this ingredient do not contribute to the anti-wrinkle rating.	-	20	-
Total				0

3-O-Ethyl Ascorbic Acid

Ingredient anti-wrinkle power

n/a

when present at, %

in this formula, est. %

Anti-wrinkle rating

Ingredient	Est. %	Benchmark It differs from one antioxidant ingredient to another, but, on average, the research suggests that topically applied antioxidants are effective in consentrations of 3% or above. Any product with a total antioxidant score of 3 or more is considered to be reach in antioxidants. It differs from one antioxidant ingredient to another, but, on average, the research suggests that topically applied antioxidants are effective in consentrations of 3% or above. Any product with a total antioxidant score of 3 or more is considered to be reach in antioxidants.
3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits. 3-O-Ethyl Ascorbic Acid A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits.	20
Ferulic Acid A plant-based phenolic acid with powerful and scientifically proven antioxidant properties. It enhances the effects of vitamins C and E, as well as the UV protective effects of sunscreens. Ferulic Acid A plant-based phenolic acid with powerful and scientifically proven antioxidant properties. It enhances the effects of vitamins C and E, as well as the UV protective effects of sunscreens.	3.4
All antioxidants	23.4	3

3-O-Ethyl Ascorbic Acid

Ferulic Acid

3.4

Benchmark

Ingredient	Est. %	Benchmark The effective concentration of soothing ingredients varies, but we consider a product rich in soothing ingredients if their estimated concentration is equal to or higher than 5%. The effective concentration of soothing ingredients varies, but we consider a product rich in soothing ingredients if their estimated concentration is equal to or higher than 5%.	Rich in Soothing
None
All soothing	0	5	No

None

Benchmark

Ingredients explained

Propanediol
Est. %	52.6
Function	Moisturizing (Humectant), Humectants are moisturizing ingredients that draw moisture to the skin, either from deeper layers or from the environment (when it's humid). Moisturizing (Humectant), Humectants are moisturizing ingredients that draw moisture to the skin, either from deeper layers or from the environment (when it's humid). Solvent, Solvent – a liquid that dissolves other ingredients. Solvent, Solvent – a liquid that dissolves other ingredients. Viscosity Controlling Viscosity controlling – changes the thickness of a product. Viscosity Controlling Viscosity controlling – changes the thickness of a product.
Origin	Botanical, Ingredients derived from plants, mosses, and lichens: extracts, oils, powders, juices and other types of processed plant materials. Botanical, Ingredients derived from plants, mosses, and lichens: extracts, oils, powders, juices and other types of processed plant materials. Biotech, The biotech origin of the ingredient implies that it was made in a lab using cultured microorganisms (bacteria or fungi) and a substrate (e.g. through the fermentation process), and then extracted and/or purified. Biotech, The biotech origin of the ingredient implies that it was made in a lab using cultured microorganisms (bacteria or fungi) and a substrate (e.g. through the fermentation process), and then extracted and/or purified. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.

An excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.

3-O-Ethyl Ascorbic Acid
Est. %	20
Function	Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Anti-Wrinkle, Anti-wrinkle ingredients prevent the formation or reduce the appearance of wrinkles. Anti-Wrinkle, Anti-wrinkle ingredients prevent the formation or reduce the appearance of wrinkles. Anti-Pigmentation Anti-pigmentation ingredients help to even skin tone by reducing the intensity of dark spots and hyperpigmentation. Anti-Pigmentation Anti-pigmentation ingredients help to even skin tone by reducing the intensity of dark spots and hyperpigmentation.
Origin	Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.

A derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits.

Olive Oil Polyglyceryl-4 Esters
Est. %	12.6
Function	Solubilizing Solubilizing – helps ingredients dissolve. Solubilizing Solubilizing – helps ingredients dissolve.
Origin

Dibutyl Lauroyl Glutamide
Est. %	6.8
Function	Film-Forming Film-forming – creates a film to increase wear time. Film-Forming Film-forming – creates a film to increase wear time.
Origin	Synthetic, All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic, All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Animal Ingredients derived from animals (including birds, fish, crustaceans, mollusks, and insects) or produced by animals (e.g. dairy- and egg-derived ingredients, bee products, silk, pearls, etc.) Animal Ingredients derived from animals (including birds, fish, crustaceans, mollusks, and insects) or produced by animals (e.g. dairy- and egg-derived ingredients, bee products, silk, pearls, etc.)

Dibutyl Ethylhexanoyl Glutamide
Est. %	4.6
Function
Origin

Ferulic Acid
Est. %	3.4
Function	Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antioxidant, Antioxidants reduce the oxidative stress caused by free radicals and prevent accelerated skin aging. Antimicrobial, Antimicrobials prevent the growth of harmful microorganisms on the skin. Antimicrobial, Antimicrobials prevent the growth of harmful microorganisms on the skin. Preservative, Preservatives prevent the growth of bacteria and fungi in a product. Preservative, Preservatives prevent the growth of bacteria and fungi in a product. Light Stabilizing Light stabilizing – absorbs UV light to protect ingredients. Light Stabilizing Light stabilizing – absorbs UV light to protect ingredients.
Origin	Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure. Synthetic All kinds of ingredients formulated or produced by a chemical process, or those that have a chemical modification in their structure.

A plant-based phenolic acid with powerful and scientifically proven antioxidant properties. It enhances the effects of vitamins C and E, as well as the UV protective effects of sunscreens.