good (skin) days™ C’s The Day Serum
Works for
Anti-agingHydroxydecyl ubiquinone, Adenosine + 3 moreWorks well
“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.”
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.
Evens skin toneArbutin, Glycyrrhiza glabra root extract + 3 moreMay help
“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.”
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.
Anti-oxidationSide benefit · Arbutin, Hydroxydecyl ubiquinone + 7 moreWorks well
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.
MoisturizingSide benefit · Glycerin, Hydroxydecyl ubiquinone + 6 moreWorks
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).
Can it cause trouble?
Irritancy1 strong irritant: Hibiscus sabdariffa flower extractMedium risk
Comedogenic1 ingredient rated 2 or more on the 0–5 pore-clogging scale1 flagged
User reviews
Be the first — your take helps the next person decide.
Ingredients
Filter by role to see what each ingredient is doing.
Water~40–60%
Butylene glycol~4.7–7.1%
- Irritation risk
- Low
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
More about Butylene glycolAscorbic acid~3.2–4.8%
- Irritation risk
- High
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
More about Ascorbic acidGlycerin~2.2–3.4%
- Irritation risk
- Low
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
More about Glycerin1,2-hexanediol~1.1–1.6%
Sodium bicarbonate~1.3–2%
Myrciaria dubia fruit extract~1–1.5%
- Irritation risk
- Medium
A plant extract that might help neutralize free radicals in skin, but research on its effectiveness is lacking
More about Myrciaria dubia fruit extractGlycyrrhiza glabra root extract~0.95–1.4%
- Irritation risk
- Medium
A plant extract that can help lighten the skin and calm down inflammation. Might be helpful in neutralizing free radicals
More about Glycyrrhiza glabra root extractNiacinamide~0.9–1.3%
- Irritation risk
- Low
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
More about NiacinamideMagnesium ascorbyl phosphate~0.5–1.2%
- Irritation risk
- Medium
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
More about Magnesium ascorbyl phosphateArbutin~0.35–0.8%
- Irritation risk
- Medium
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
More about ArbutinTocopheryl acetate~0.2–0.7%
- Irritation risk
- Medium
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.
More about Tocopheryl acetateCoptis japonica extract~0.1–0.45%
- Irritation risk
- High
Panax ginseng berry extract~0.1–0.35%
- Irritation risk
- Low
Crocus sativus flower extract~0.1–0.4%
- Irritation risk
- Low
Tuber magnatum extract~0.1–0.35%
- Irritation risk
- Low
Hibiscus sabdariffa flower extract~0.1–0.4%
- Irritation risk
- High
A plant extract that can be irritating. It might contain a compound anthocyanin that could be helpful in neutralizing free radicals
More about Hibiscus sabdariffa flower extractTheobroma cacao extract~0.1–0.4%
- Irritation risk
- Low
- Comedogenicity
- 3/5
Glycereth-25 pca isostearate~0.1–0.35%
Hydroxydecyl ubiquinone~0.1–0.3%
- Irritation risk
- Medium
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
More about Hydroxydecyl ubiquinoneSodium metabisulfite~0.1–0.2%
Xanthan gum~0.1–0.35%
- Irritation risk
- Low
Used to create a thicker product consistency
More about Xanthan gumEthylhexylglycerin~0.05–0.25%
Adenosine~0.05–0.2%
- Irritation risk
- Low
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)
More about AdenosineDextrin~0.05–0.25%
- Irritation risk
- Low
A sugar that is used to stabilize the product formulation. Can help attract water to the upper layer of the skin
More about DextrinCaprylic/capric triglyceride~0.05–0.25%
- Irritation risk
- Medium
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
More about Caprylic/capric triglycerideCetyl ethylhexanoate~0.05–0.15%
- Irritation risk
- Medium
An emollient that helps soften the skin and creates a thicker product texture
More about Cetyl ethylhexanoateHydrogenated lecithin~0.01–0.05%
- Irritation risk
- Low
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.
More about Hydrogenated lecithinIngredient 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
Compare prices
Retailers ranked by price — lowest first.
Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.
Worth comparing, line by line.
Match % combines shared ingredients, the first five ingredients, shared actives and hero ingredients, irritancy (lower counts in the alternative's favour), texture and body area. Only products in the same routine step are compared.
| good (skin) days™C’s The Day SerumYOUR PRODUCT | Purito SEOULPure Vitamin C Serum | Skin RepublicVitamin C 6% & Alpha Arbutin 1.5% Serum | Vitabrid13 YEARS YOUNGER WRINKLE SERUM PROFESSIONAL: REGULAR PRICE | Vitabrid US | |
|---|---|---|---|---|
| Match | — | 91% | 88% | 85% |
| Price | — | $14.40 | — | — |
| Shared key ingredients | — | 3 of 6 | 2 of 6 | 4 of 6 |
| Key difference | — | Glutathione | Panthenol | Copper Tripeptide-1 |
| Irritancy | Medium | Low | Medium | Medium |
| Drying alcohol | — | — | — | — |
| View product | Shop | Shop | Shop |
More alternatives: Pre-Launch V.Biome Infusion SerumSome By Mi Galactomyces Pure Vitamin C Glow Serum
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.
Sources cited in this review
Every concentration estimate and effectiveness label is anchored to one of these 16 studies and safety reviews.
- 1
- 2
- 3
- 4
- 5
- 6
Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.