Works for
Anti-agingAscorbyl tetraisopalmitate, Ascorbyl glucoside + 2 moreMay help
“Here, its action is focused on melanocytes (to treat blemishes from the inside) and on collagen synthesis (to prevent and fight wrinkles from the inside).”
This product contains ascorbyl glucoside, ascorbyl tetraisopalmitate, ferulic acid. These ingredients might be able to help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness, but there is not enough evidence that it actually works.
Anti-blemishNo ingredient credited for this claimNot delivered
“Here, its action is focused on melanocytes (to treat blemishes from the inside) and on collagen synthesis (to prevent and fight wrinkles from the inside).”
Effective ingredients missing or their concentration is too low.
Anti-oxidationNot advertised by the brand · Ascorbyl tetraisopalmitate, Ascorbyl glucoside + 4 moreWorks well
This product contains antioxidants (ascorbyl tetraisopalmitate, ferulic acid) 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 - ascorbyl glucoside also can have an antioxidant effect, but there is less evidence to confirm their effectiveness in skin.
MoisturizingNot advertised by the brand · Glycerin, Tricaprylin + 3 moreWorks
This product contains good ingredients to attract water to the upper layer of the skin. These ingredients are called "humectants": glycerin.
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).
Evens skin toneNot advertised by the brand · Ascorbyl tetraisopalmitate, Ascorbyl glucoside + 2 moreMay help
The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually works: ascorbyl glucoside, ascorbyl tetraisopalmitate, ferulic acid, glycine soja seed extract.
Can it cause trouble?
Irritancy10 flagged ingredientsLow risk
ComedogenicClean of flagged comedogenic ingredientsNone flagged
User reviews
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Ingredients
Filter by role to see what each ingredient is doing.
Water~40–60%
Ascorbyl tetraisopalmitate~5.8–8.7%
- Irritation risk
- Medium
A vitamin C derivative. Studies show that is might be effective in reducing hyperpigmentation, but there are no studies confirming that it is effectively converted into the bioavailable form of Vitamin C in skin. It is not clear how this derivative compares in effectiveness to the topical application of bioavailable form of vitamin C (L-ascorbic acid)
More about Ascorbyl tetraisopalmitatePropanediol~3.7–5.6%
- Irritation risk
- Low
Acts as a solvent for other ingredients. Speeds up the absorption of other ingredients into the skin
More about PropanediolAscorbyl glucoside~2.9–4.3%
- Irritation risk
- Medium
A vitamin C derivative that is more stable but less potent than pure form of vitamin C. Has a potential to boost collagen production, nutralise free radicals and reduce hyperpigmentation, but the required concentration is likely to be much higher than for the pure form of vitamin C, limiting the ingredient's effectiveness in products
More about Ascorbyl glucosideGlycerin~2.2–3.2%
- 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 GlycerinTricaprylin~1.7–2.6%
- Irritation risk
- Low
An emollient that helps soften the skin. Can increase penetration of other ingredients
More about TricaprylinMethylpropanediol~1.4–2%
Glycine soja seed extract~1.2–1.8%
- Irritation risk
- Medium
An emollient that helps soften the skin. Might be somewhat helpful in evening the skin tone.
More about Glycine soja seed extractTocopheryl acetate~0.9–1.4%
- 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 acetateAscorbyl methylsilanol pectinate~0.8–1.25%
- Irritation risk
- Medium
A stable derivative of pectin and vitamin C. It might help neutralize free radicals in skin, but evidence of effectiveness is lacking. Helps create a thicker product consistency and stabilize the product formulation
More about Ascorbyl methylsilanol pectinateFerulic acid~0.5–1.2%
- Irritation risk
- Low
A potent anti-oxidant that has been shown to be effective in neutralizing free radicals in skin. There seem to have a synergetic effect of ferulic acid, vitamin E and C, meaning that when the ingredients are used together, they enhance each other's ability protect the skin against free radicals. Ferulic acid also helps to stabilize other ingredients - including vitamins C and E. It can help to even out the skin tone. Ferulic acid is approved for use as a sunscreen ingredient in Japan in concentrations up to 10%
More about Ferulic acidLecithin~0.45–1.1%
- Irritation risk
- Low
Used mostly for creating emulsions - helping oil and water mix together. Helps soften the upper layer of the skin
More about LecithinSclerotium gum~0.35–0.85%
- Irritation risk
- Low
Used to create gel-like formulas and stabilize emulsions
More about Sclerotium gumPullulan~0.3–0.75%
- Irritation risk
- High
Creates a thin drying film on the skin resulting in a short-term tightening effect
More about PullulanXanthan gum~0.2–0.75%
- Irritation risk
- Low
Used to create a thicker product consistency
More about Xanthan gumSilica~0.35–0.85%
Sodium hydroxide~0.1–0.45%
Sodium citrate~0.1–0.35%
- Irritation risk
- Medium
Helps to control the skin's pH level. Maintains the skin's natural film of amino-lactic acids and oils. Helps to preserve products
More about Sodium citrateCitric acid~0.05–0.25%
- Irritation risk
- Medium
Can work as an exfoliant but is typically used to adjust the product pH
More about Citric acidSodium benzoate~0.05–0.25%
Potassium sorbate~0.05–0.25%
Ingredient list view
Water, Ascorbyl tetraisopalmitate, Propanediol, Ascorbyl glucoside, Glycerin, Tricaprylin, Methylpropanediol, Glycine soja seed extract, Tocopheryl acetate, Ascorbyl methylsilanol pectinate, Ferulic acid, Lecithin, Sclerotium gum, Pullulan, Xanthan gum, Silica, Sodium hydroxide, Sodium citrate, Citric acid, Sodium benzoate, Potassium sorbate
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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.
| TheramidC-TETRA E.FYOUR PRODUCT | Transparent LabC-TETRA E.F. Intensive Vitamin C Treatment | CRUNCHII AM Bright Vitamin C Facial Serum | Skintitut10% Vitamin C Super Serum | |
|---|---|---|---|---|
| Match | — | 70% | 46% | 46% |
| Price | — | — | — | $48.45 |
| Shared key ingredients | — | 5 of 5 | 3 of 5 | 3 of 5 |
| Key difference | — | — | Niacinamide | Panthenol |
| Irritancy | Low | Low | Low | Low |
| Drying alcohol | — | — | — | — |
| View product | Shop | Shop | Shop |
More alternatives: Zelens Power C Collagen-Boosting and Brightening SerumIntraceuticals Booster Vitamin C+3
Product summary
"Theramid - C-TETRA E. F" could be helpful for: Moisturizing, Anti-aging and Evens skin tone, but its actives are not the most effective or are not well-studied.
Ingredient callouts
- Humectants (glycerin 2.20% - 3.20%). 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 10 studies and safety reviews.
- 1
- 2
- 3
- 4
- 5The Roles of Vitamin C in Skin Healthncbi.nlm.nih.gov
- 6
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