PRODUCT REVIEW
Medik8 C-Tetra Day Cream
Can it cause trouble?
Buy from Amazon US $55.00
More options from: $53.00
Price as of 1/2/2026 7:16 GMT.
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What can the product work for?
Moisturizing
What does the product description say?
C-Tetra Day Cream
caprylic/capric triglyceride
3.9% -
5.9%
Irritation risk:
Concentration: Effectiveness: HIGH
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
sodium hyaluronate
0.4% -
1%
Irritation risk:
Concentration: Effectiveness: HIGH
One of the best moisturizing ingredients. Attracts water into the upper layer of the skin
glycerin
0.4% -
0.9%
Irritation risk:
Concentration: Effectiveness: HIGH
One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant
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Anti-aging
What does the product description say?
Featuring tetrahexyldecyl ascorbate (a low irritation form of vitamin C) combined with co-antioxidant vitamin E, the moisturizer helps to reduce the appearance of premature skin aging signs .
tetrahexyldecyl ascorbate
2.8% -
4.3%
Irritation risk:
Concentration: Insufficient!
Being a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.
Anti-oxidation
tocopheryl acetate
1% -
1.5%
Irritation risk:
Concentration: Effectiveness:
LOW
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.
pelargonium graveolens flower oil
0.15% -
0.55%
Irritation risk:
Concentration: Effectiveness:
LOW
An essential oil. Can be irritating. Can become an allergen with oxidation
tetrahexyldecyl ascorbate
2.8% -
4.3%
Irritation risk:
Concentration: Insufficient!
Being a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.
Honesty check
How honest is this product?
| Promise | Can it deliver? |
|---|---|
| Moisturizing | |
| Anti-aging |
Total Promises Fulfilled score:
37/100.
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Can it cause trouble?
- Overall product irritation risk
- Acne & comedogenic risk ingredients: 0
Potential irritants
phenylpropanol
0.2% -
0.8%
Irritation risk:
Helps mask the smell of other ingredients and helps preserve the product formulation
citrus grandis peel oil
0.15% -
0.6%
Irritation risk:
A plant oil with high content of volatile compounds that, especially when exposed to air, can cause allergic reactions and irritate the skin
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Comodogenic ingredients
No comodogenic ingredients detected
User reviews (0)
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| WIMJ similarity score |
69%
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Other:
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| Irritancy | IRRITANCY
HIGH
| IRRITANCY
MEDIUM
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MEDIUM
| IRRITANCY
HIGH
| IRRITANCY
LOW
| IRRITANCY
HIGH
| IRRITANCY
MEDIUM
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MEDIUM
| IRRITANCY
MEDIUM
| IRRITANCY
HIGH
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HIGH
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Ingredients & concentrations
All ingredients
Key Actives
tetrahexyldecyl ascorbate
2.8% -
4.3%
Irritation risk:
Works for:
Anti-aging,
Evens skin tone,
Anti-oxidation
Being a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.
caprylic/capric triglyceride
3.9% -
5.9%
Irritation risk:
Works for:
Moisturizing
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
Show more
Potential irritants
phenylpropanol
0.2% -
0.8%
Irritation risk:
Helps mask the smell of other ingredients and helps preserve the product formulation
citrus grandis peel oil
0.15% -
0.6%
Irritation risk:
A plant oil with high content of volatile compounds that, especially when exposed to air, can cause allergic reactions and irritate the skin
Show more
Comodogenic ingredients
We couldn't find any comodogenic ingredients in this product
All ingredients
heptyl undecylenate
4.9% -
7.4%
Irritation risk:
Works for:
Moisturizing
Helps soften the upper layer of the skin, reduce water loss from the skin surface over time and create a nice product finish
caprylic/capric triglyceride
3.9% -
5.9%
Irritation risk:
Works for:
Moisturizing
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
Show more
Ingredient list view
Water, Heptyl undecylenate, Caprylic/capric triglyceride, Tetrahexyldecyl ascorbate, Methylpropanediol, Cetearyl olivate, Cetearyl isononanoate, Distarch phosphate, Tocopheryl acetate, Sodium polyacrylate, Sorbitan olivate, Sodium hyaluronate, Caprylyl glycol, Glycerin, Disodium edta, Phenylpropanol, Citrus grandis peel oil, Citrus limon peel oil, Citrus aurantium bergamia fruit oil, Pelargonium graveolens flower oil, Sodium hydroxide, Limonene, Citronellol, Linalool, Geraniol, Citral
Sources
- Double-blind, half-face study comparing topical vitamin C and vehicle for rejuvenation of photodamage
- Application of tetra-isopalmitoyl ascorbic acid in cosmetic formulations: Stability studies and in vivo efficacy
- Hyaluronic acid: A key molecule in skin aging
- Hyaluronan (Hyaluronic Acid): a natural moisturizer for skin care
- Glycerol and the skin: holistic approach to its origin and functions
- Safety Assessment of Citrus-Derived Peel Oils as Used in Cosmetics
- Oxidized citrus oil (R-limonene): A frequent skin sensitizer in Europe
- Air oxidation increases skin irritation from fragrance terpenes
- Fragrance Compound Geraniol Forms Contact Allergens on Air Exposure. Identification and Quantification of Oxidation Products and Effect on Skin Sensitization