Works for:
based on ingredients and %- Evens skin tone
- Anti-oxidation
- Moisturizing
- Anti-aging
Can it cause trouble?
- Irritation risk: medium
- Comedogenic risk ingredients: 1
Key actives
Product Summary
"good (skin) days™ - C’s The Day Serum" is effective for: Anti-aging
This product could be helpful for: Evens skin tone and Moisturizing, but its actives are not the most effective or are not well-studied.
Ingredient callouts
- This product also contains Vitamin C (Ascorbic Acid) 3.20% - 4.80% It can be helpful in stimulating collagen production, neutralizing free radicals in skin and improving pigmentation marks. We recommend to use up this product quickly after opening: Ascorbic Acid degrades fast when it gets in contact with air and light. The moment the product turns orange, it is a sign that a significant share of the vitamin C in it is no longer effective.
- Adenosine 0.05% - 0.20%. It is a compound that in involved in many biological processes inside the skin cells. According one high-quality clinical trial, topical Adenosine in low concentrations can somewhat help improve "deep wrinkles" - the wrinkles that appear with age in places where our faces are most dynamic (for example, on the forehead or in the corners of the eyes).
- Humectants (glycerin 2.20% - 3.40%). These ingredients help attract water to the upper layer of the skin and improve the skin hydration.
Anti-aging
What does the product description say?
Not only is it formulated with 10% pure vitamin C (ascorbic acid), but it also contains skin brightening licorice root extract and niacinamide (vitamin B3) to diminish dullness, improve tone, and minimize the appearance of pores and fine lines.
Source: Soko Glam
This product can help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness because it contains adenosine.
These ingredients in the product can also be helpful, even though there is less evidence for their effectiveness: hydroxydecyl ubiquinone.
Keep in mind that it typically takes at least 6 weeks to notice any results because the changes that are needed to improve fine lines and elasticity happen in the deeper layers of the skin. No topical anti-aging product can “erase” wrinkles or fully reverse signs of aging.
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production
A derivative of vitamin C that is more stable, but less bioavailable than the pure form of vitamin C. It does not penetrate the skin well, but has been shown to convert to pure vitamin C once in skin. It can be helpful in stimulating collagen production and lightening the skin tone, but the required concentration is likely to be very high
Anti-oxidation
This product contains antioxidants (hydroxydecyl ubiquinone) that can help neutralize free radicals in skin. By doing so, they can lessen the damage the skin gets from the UV light (sun).
The following ingredients - arbutin also can have an antioxidant effect, but there is less evidence to confirm their effectiveness in skin.
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
Beta-arbutin. Can help to reduce hyperpigmentation and has an anti-oxidant effect when used in high enough concentration. Is less effective compared to alpha-arbutin
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
A plant extract that might help neutralize free radicals in skin, but research on its effectiveness is lacking
A plant extract that can help lighten the skin and calm down inflammation. Might be helpful in neutralizing free radicals
A plant extract that can be irritating. It might contain a compound anthocyanin that could be helpful in neutralizing free radicals
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
A more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.
A derivative of vitamin C that is more stable, but less bioavailable than the pure form of vitamin C. It does not penetrate the skin well, but has been shown to convert to pure vitamin C once in skin. It can be helpful in stimulating collagen production and lightening the skin tone, but the required concentration is likely to be very high
Evens skin tone
What does the product description say?
Not only is it formulated with 10% pure vitamin C (ascorbic acid), but it also contains skin brightening licorice root extract and niacinamide (vitamin B3) to diminish dullness, improve tone, and minimize the appearance of pores and fine lines.
Source: Soko Glam
The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually works: arbutin, glycyrrhiza glabra root extract.
Beta-arbutin. Can help to reduce hyperpigmentation and has an anti-oxidant effect when used in high enough concentration. Is less effective compared to alpha-arbutin
A plant extract that can help lighten the skin and calm down inflammation. Might be helpful in neutralizing free radicals
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production
A derivative of vitamin C that is more stable, but less bioavailable than the pure form of vitamin C. It does not penetrate the skin well, but has been shown to convert to pure vitamin C once in skin. It can be helpful in stimulating collagen production and lightening the skin tone, but the required concentration is likely to be very high
Moisturizing
This product contains good ingredients to attract water to the upper layer of the skin. These ingredients are called "humectants": glycerin, butylene glycol.
When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. If the air is dry, humectants can speed up the moisture loss from the skin. This is why it is a good idea to use another product on top of this one to help "seal in" the moisture (look for ingredients like dimethicone, squalane, oils and butters).
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
Used to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin
An emollient that helps soften the skin and creates a thicker product texture
A sugar that is used to stabilize the product formulation. Can help attract water to the upper layer of the skin
A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin
Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production
How honest is this product?
| Promise | Can it deliver? |
|---|---|
| Evens skin tone | |
| Anti-aging |
Total Promises Fulfilled score: 75/100.
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Potential irritants
Comedogenic ingredients
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| Product | Similarity | Price | Irritancy |
|---|---|---|---|
 good (skin) days™ C’s The Day Serum | Current | $27.99 | |
PURITO Pure Vitamin C Serum | 91% | $12.83 | |
SkinRepublic Vitamin C 6% & Alpha Arbutin 1.5% Serum | 88% | $24.99 | |
 VITABRID INC. Wrinkle Serum Professional | 85% | $83.00 | |
 Vitabrid US 13 YEARS YOUNGER WRINKLE SERUM PROFESSIONAL: REGULAR PRICE | Vitabrid US | 85% | $83.00 | |
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Key Actives
Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
Beta-arbutin. Can help to reduce hyperpigmentation and has an anti-oxidant effect when used in high enough concentration. Is less effective compared to alpha-arbutin
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
Potential irritants
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
A plant extract that can be irritating. It might contain a compound anthocyanin that could be helpful in neutralizing free radicals
A plant extract that might help neutralize free radicals in skin, but research on its effectiveness is lacking
A plant extract that can help lighten the skin and calm down inflammation. Might be helpful in neutralizing free radicals
A derivative of vitamin C that is more stable, but less bioavailable than the pure form of vitamin C. It does not penetrate the skin well, but has been shown to convert to pure vitamin C once in skin. It can be helpful in stimulating collagen production and lightening the skin tone, but the required concentration is likely to be very high
Beta-arbutin. Can help to reduce hyperpigmentation and has an anti-oxidant effect when used in high enough concentration. Is less effective compared to alpha-arbutin
A more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin
An emollient that helps soften the skin and creates a thicker product texture
Comedogenic ingredients
All ingredients
Used to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin
The most well-researched antioxidant that works in skin. Helps neutralize free radicals supporting collagen production, helping to even out the skin tone and preventing early signs of aging
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
A plant extract that might help neutralize free radicals in skin, but research on its effectiveness is lacking
A plant extract that can help lighten the skin and calm down inflammation. Might be helpful in neutralizing free radicals
Is proven to be effective in reducing blemishes, evening out skin tone and helping to improve lines and wrinkles. It helps the skin to repair sun damage, calm down inflammation and keep maintain good levels of moisture. The concentration of about 2% is effective for supporting the skin barrier and evening out the skin tone. Concentration of 4-6% is better for helping with acne and balancing the sebum production
A derivative of vitamin C that is more stable, but less bioavailable than the pure form of vitamin C. It does not penetrate the skin well, but has been shown to convert to pure vitamin C once in skin. It can be helpful in stimulating collagen production and lightening the skin tone, but the required concentration is likely to be very high
Beta-arbutin. Can help to reduce hyperpigmentation and has an anti-oxidant effect when used in high enough concentration. Is less effective compared to alpha-arbutin
A more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.
A plant extract that can be irritating. It might contain a compound anthocyanin that could be helpful in neutralizing free radicals
An analogue of coenzyme Q10 that has a lower molecular weight, which can improve its ability to penetrate the skin. It helps neutralize free radicals in skin, improves skin hydration and might be helpful agains fine lines and wrinkles. It can be an allergen
Might help improve cell turnover and reduce inflammation in skin. One study shows that the ingredients might be able to help reduce dynamic wrinkles (for example, in the corners of the eyes or on the forehead)
A sugar that is used to stabilize the product formulation. Can help attract water to the upper layer of the skin
A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin
An emollient that helps soften the skin and creates a thicker product texture
Helps to retain moisture by creating a protective barrier on the skin. Rich in fatty acids. Improves product texture and helps with the penetration of other ingredients.
Ingredient list view
Water, Butylene glycol, Ascorbic acid, Glycerin, 1,2-hexanediol, Sodium bicarbonate, Myrciaria dubia fruit extract, Glycyrrhiza glabra root extract, Niacinamide, Magnesium ascorbyl phosphate, Arbutin, Tocopheryl acetate, Coptis japonica extract, Panax ginseng berry extract, Crocus sativus flower extract, Tuber magnatum extract, Hibiscus sabdariffa flower extract, Theobroma cacao extract, Glycereth-25 pca isostearate, Hydroxydecyl ubiquinone, Sodium metabisulfite, Xanthan gum, Ethylhexylglycerin, Adenosine, Dextrin, Caprylic/capric triglyceride, Cetyl ethylhexanoate, Hydrogenated lecithin
- Glycerol and the skin: holistic approach to its origin and functions
- The influence of alkane chain length on the skin irritation potential of 1,2-alkanediols
- Antioxidant and Associated Capacities of Camu Camu (Myrciaria dubia): A Systematic Review
- Niacinamide - mechanisms of action and its topical use in dermatology
- Gehring, W. (2004). Nicotinic acid/niacinamide and the skin. Journal of Cosmetic Dermatology, 3(2), 88–93. doi:10.1111/j.1473-2130.2004.00115.x
- Stability, transdermal penetration, and cutaneous effects of ascorbic acid and its derivatives
- Topical L-ascorbic acid: percutaneous absorption studies
- Arbutin - Commentaty
- TOPICAL TREATMENT OF MELASMA
- Anthocyanin-rich extract from Hibiscus sabdariffa calyx counteracts UVC-caused impairments in rats
- Hibiscus sabdariffa L. – A phytochemical and pharmacological review
- Liposome-containing Hibiscus sabdariffa calyx extract formulations with increased antioxidant activity, improved dermal penetration and reduced dermal toxicity
- Allergic contact dermatitis to hydroxydecyl ubiquinone (idebenone) following application of anti-ageing cosmetic cream
- Blackwell Publishing, Ltd. Clinical efficacy assessment in photodamaged skin of 0.5% and 1.0% idebenone
- Final report on the safety assessment of sodium sulfite, potassium sulfite, ammonium sulfite, sodium bisulfite, ammonium bisulfite, sodium metabisulfite and potassium metabisulfite
- Evaluation of anti-wrinkle efficacy of adenosine-containing products using the FOITS technique