Kose Sekkisei Cream Excellent

Kose Sekkisei Cream Excellent

Efficacy75/100IrritancyHigh
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Works for

2 of 2 advertised claims delivered

Evens skin tone
Ascorbyl glucoside, Taurine
Moderate evidence
What the product description says
“Eliminates dark spots & combat melanin formation.”
Source: Yesstyle

The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually works: ascorbyl glucoside.

Ascorbyl glucosideKey activeEffect: MediumA 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~23–34%
TaurineEffect: LowCould be helpful in reducing inflammation in skin, evening out the skin tone and neutralizing free radicals, but more research is needed to confirm its effectiveness~0.9–1.35%
Moisturizing
Methicone, Squalane + 5 more
Good evidence
What the product description says
“Helps refresh skin to prevent dryness & roughness.”
Source: Yesstyle

This product can help improve hydration of the skin with the two types of ingredients.

The first type is called “humectants”:
these ingredients help attract water. 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. The following ingredients in this product do the job: glycerin, butylene glycol.

This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: methicone, squalane.

MethiconeKey active· Emollient, OcclusiveEffect: HighA type of silicone that helps soften the upper layer of the skin and reduces the water loss from the skin surface~0.5–1.2%
SqualaneKey active· Emollient, OcclusiveEffect: HighAn oil naturally present in skin. Works as an emollient to soften the skin and form a protective layer on its surface without a greasy feeling.~2.9–4.3%
GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~3.4–5.1%
Cetearyl alcoholKey active· EmollientEffect: MediumA non-drying alcohol. Works as an emollient. Helps water and oil mix together and creates a nice product texture~1.4–2.1%
Cetyl palmitateKey active· EmollientEffect: MediumAn emollient that helps soften the skin and is used to improve product texture and stability~0.5–1.15%
Behenyl alcohol· Emollient, OcclusiveEffect: LowNon-drying alcohol that helps water and oil mix together. Also serves as an emollient~0.5–1.15%
Butylene glycol· HumectantEffect: LowUsed 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~5.1–7.6%
Anti-oxidation
Not advertised by the brand · Ascorbyl glucoside, Taurine
Moderate evidence

This product contains antioxidants (ascorbyl glucoside) that might be able to help neutralize free radicals in skin to lessen the damage it gets from the UV light (sun). There is not enough evidence to confirm their effectiveness in skin though.

Ascorbyl glucosideKey activeEffect: MediumA 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~23–34%
TaurineEffect: LowCould be helpful in reducing inflammation in skin, evening out the skin tone and neutralizing free radicals, but more research is needed to confirm its effectiveness~0.9–1.35%
Anti-aging
Not advertised by the brand · Ascorbyl glucoside
Moderate evidence

This product contains ascorbyl glucoside. This ingredient 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.

Ascorbyl glucosideKey activeEffect: MediumA 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~23–34%

Can it cause trouble?

Irritancy
3 strong irritants: Alcohol, Menthol + 1 more — patch-test recommended
High risk
We flagged 8 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
AlcoholCan be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial propertiesHigh~1.9–2.8%est.
Menthol—High~0.5–1.2%est.
ParfumAn aromatic blend of unspecified and possibly irritating ingredientsHigh~0.1–0.3%est.
Ascorbyl glucosideA 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 productsMedium~23–34%est.
Daucus carota sativa extract—Medium~1.2–1.8%est.
TaurineCould be helpful in reducing inflammation in skin, evening out the skin tone and neutralizing free radicals, but more research is needed to confirm its effectivenessMedium~0.9–1.35%est.
Citric acidCan work as an exfoliant but is typically used to adjust the product pHMedium~0.5–1.15%est.
Benzoic acidA preservativeMedium~0.1–0.4%est.
Comedogenic
1 ingredient rated 2 or more on the 0–5 pore-clogging scale
1 flagged
These ingredients have a comedogenic rating of 2 or more on a 0–5 scale; the table shows each one's rating. In leave-on products they can clog pores in acne-prone skin.
IngredientFunctionRatingEst. amount
Cetearyl alcoholA non-drying alcohol. Works as an emollient. Helps water and oil mix together and creates a nice product texture2/5~1.4–2.1%est.
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Ingredients

Filter by role to see what each ingredient is doing.

Ascorbyl glucoside~23–34%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Anti-agingAnti-oxidationEvens skin tone

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 glucoside
Water~12–18%
Formula
Irritation risk
Low

Plain old water

More about Water
Butylene glycol~5.1–7.6%
Formula
Irritation risk
Low
Works for
Moisturizing

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 glycol
Meadowfoam oil
Not recognized
Glycerin~3.4–5.1%
Key active
Irritation risk
Low
Works for
Moisturizing

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 Glycerin
Squalane~2.9–4.3%
Key active
Irritation risk
Low
Works for
Moisturizing

An oil naturally present in skin. Works as an emollient to soften the skin and form a protective layer on its surface without a greasy feeling.

More about Squalane
Alcohol~1.9–2.8%
Irritant · high
Irritation risk
High
Works for
Antibacterial

Can be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial properties

More about Alcohol
Cholesteryl hydroxystearate~1.6–2.3%
Formula
Cetearyl alcohol~1.4–2.1%
Key activeComedogenic 2/5
Irritation risk
Low
Comedogenicity
2/5
Works for
CleansingMoisturizing

A non-drying alcohol. Works as an emollient. Helps water and oil mix together and creates a nice product texture

More about Cetearyl alcohol
Daucus carota sativa extract~1.2–1.8%
Irritant · medium
Yokuinin~1.2–1.8%
Formula
Irritation risk
Low
More about Yokuinin
Extract, fuyubushi summer grass extract, n-stearoyl-n-methyl
Not recognized
Taurine~0.9–1.35%
Irritant · medium
Irritation risk
Medium
Works for
Anti-inflammatoryAnti-blemishAnti-oxidationEvens skin tone

Could be helpful in reducing inflammation in skin, evening out the skin tone and neutralizing free radicals, but more research is needed to confirm its effectiveness

More about Taurine
Sodium, l
Not recognized
Menthol~0.5–1.2%
Irritant · high
Irritation risk
High
More about Menthol
Xanthan gum~0.5–1.2%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Citric acid~0.5–1.15%
Irritant · medium
Irritation risk
Medium

Can work as an exfoliant but is typically used to adjust the product pH

More about Citric acid
Cetyl palmitate~0.5–1.15%
Key active
Irritation risk
Low
Works for
Moisturizing

An emollient that helps soften the skin and is used to improve product texture and stability

More about Cetyl palmitate
Behenyl alcohol~0.5–1.15%
Formula
Irritation risk
Low
Works for
Moisturizing

Non-drying alcohol that helps water and oil mix together. Also serves as an emollient

More about Behenyl alcohol
Methicone~0.5–1.2%
Key active
Irritation risk
Low
Works for
Moisturizing

A type of silicone that helps soften the upper layer of the skin and reduces the water loss from the skin surface

More about Methicone
Disodium phosphate~0.45–1.05%
Formula
Irritation risk
Low

Helps adjust the product pH and stabilize the formulation

More about Disodium phosphate
Sodium hydroxide~0.4–0.9%
Formula
Irritation risk
Low

Used to adjust the product's pH

More about Sodium hydroxide
Hydrogen~0.35–0.8%
Formula
Irritation risk
Low
More about Hydrogen
Glycine soja extract~0.2–0.75%
Formula
Alcohol~0.1–0.5%
Irritant · high
Irritation risk
High
Works for
Antibacterial

Can be drying and contribute to skin irritation. Used in formulars to dissolve other ingredients, create a thinner product consistency or for its antibacterial properties

More about Alcohol
Benzoic acid~0.1–0.4%
Irritant · medium
Irritation risk
Medium

A preservative

More about Benzoic acid
Ester
Not recognized
Parfum~0.1–0.3%
Irritant · high
Irritation risk
High

An aromatic blend of unspecified and possibly irritating ingredients

More about Parfum
Ingredient list view

Ascorbyl glucoside, Water, Butylene glycol, Unknown, Glycerin, Squalane, Alcohol, Cholesteryl hydroxystearate, Cetearyl alcohol, Daucus carota sativa extract, Yokuinin, Unknown, Taurine, Unknown, Menthol, Xanthan gum, Citric acid, Cetyl palmitate, Behenyl alcohol, Methicone, Disodium phosphate, Sodium hydroxide, Hydrogen, Glycine soja extract, Alcohol, Benzoic acid, Unknown, Parfum

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$100.98
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 4 studies and safety reviews.

  1. 1
  2. 2
  3. 3
  4. 4
Kose Sekkisei Cream Excellent
KoseSekkisei Cream Excellent

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