St. Moriz Instant Self-Tanning Mousse Review

St. Moriz Instant Self-Tanning Mousse
5.0
/ 10
Moisturizing
10.0 Humectancy icon Humectancy
0.0 Occlusivity icon Occlusivity
Ingredients

St. Moriz Instant Self-Tanning Mousse Ingredients

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Full Ingredient List (INCI):

Water, Dihydroxyacetone, Propylene Glycol, Ethoxydiglycol, Polysorbate 20, Cocamidopropyl Betaine, Fragrance, Citric Acid, 2-Bromo-2-Nitropropane-1,3-Diol, Coumarin, Citronellol, Alpha-Isomethyl Ionone, Butylphenyl Methylpropional, Eugenol, Red 40 (CI 16035), Yellow 5 (CI 19140), Blue 1 (CI 42090)
Review

Does St. Moriz Instant Self-Tanning Mousse Work?

 
According to CreamScan's analysis of the ingredient list, here’s what St. Moriz Instant Self-Tanning Mousse has to offer:
 
✅ Strong humectant moisturizing. This lightweight, humectant-rich product, ideal for oily skin, has a moisturizing rating of 5.0 out of 10.

  

Key Benefits of St. Moriz Instant Self-Tanning Mousse

 
These are the key benefits you can expect from using St. Moriz Instant Self-Tanning Mousse:
 

🔵 Lightweight Purely Humectant Moisturizing, Ideal for Oily Skin

According to CreamScan analysis, St. Moriz Instant Self-Tanning Mousse is quite moisturizing, with a moisturizing rating of 5.0 out of 10.

Is it more humectant or occlusive? It is purely humectant. It has zero occlusivity (we didn't find any occlusive ingredients on the ingredient list) and a maximum humectancy of 10 out of 10, due to the high content of Propylene Glycol (est. ≈6.0%) and Ethoxydiglycol (est. ≈4.0%).

This humectant-rich product, when used alone as a moisturizer, is ideal for oily skin, providing significant hydration in a lightweight, fast-absorbing formula without any occlusive ingredients.

📌 Certain studies suggest that humectants alone may not effectively moisturize the skin. If you use this product as your only moisturizer, we recommend following it with one that contains at least some occlusive ingredients.

💧 A Humectant Boost for Any Skincare Routine

But it’s not limited to oily skin - such a humectant boost will also positively contribute to the moisturizing efficacy of any skincare routine when used as a step before applying the main moisturizer. This type of formulation is typically used in serums, where a light, fast-absorbing texture is key.

Please refer to the Ratings section below for details of the moisturizing rating calculation.

📌 Please note that this is not a complete list of benefits. We are in the process of enhancing our model to incorporate anti-pigmentation, exfoliation and anti-acne ratings.

Things to Be Aware Of: St. Moriz Instant Self-Tanning Mousse

 
CreamScan identified a few things to consider before adding St. Moriz Instant Self-Tanning Mousse to your skincare routine:
 

⚠️ If It’s Your Only Moisturizer, It Needs to Be Paired with Some Occlusives

While humectants are highly effective at attracting water to the skin, studies (J. N. Kraft, C. W. Lynde) suggest they may not be efficient when used alone.

One major drawback of purely humectant moisturization is that the water attracted by humectants to the upper layers of the skin can evaporate completely into the environment through transepidermal water loss (TEWL). Adding occlusive ingredients helps seal this moisture into the skin and prevent further water loss.

If you’re using St. Moriz Instant Self-Tanning Mousse as your only moisturizer, consider pairing it with one that contains at least some occlusive ingredients, such as oils, butters, or silicones. These work alongside humectants to create a protective barrier, locking in hydration and ensuring longer-lasting moisturization. The amount of occlusive needed depends on your skin type - the drier the skin, the more occlusives it requires.

If this product is used not as a standalone moisturizer but as part of your skincare routine, such as a toner or serum, it should be applied before your main moisturizer (unless it's a sunscreen), which will provide the necessary occlusivity on top of it.

Pros & Cons of St. Moriz Instant Self-Tanning Mousse

 
Here’s an overview of the pros and cons of St. Moriz Instant Self-Tanning Mousse to help you decide if it’s the right choice for your skincare routine:
 

🟩 Pros:

✅ When used alone: Provides humectant-rich moisturizing ideal for oily skin
✅ As part of a routine: A humectant moisturizing boost, beneficial for any skin type
✅ Lightweight texture
 

⭕ Cons: 

⚠️ Only if used as a standalone moisturizer - it needs to be paired with occlusives to seal in humectants
   

Summary: St. Moriz Instant Self-Tanning Mousse

 
Based on the ingredient list analysis, CreamScan AI suggests that St. Moriz Instant Self-Tanning Mousse
, when used alone, delivers lightweight, humectant-rich moisturizing, making it ideal for oily skin. As part of a moisturizing routine, it provides a humectant boost, beneficial for all skin types.
 
That said, there are some things about St. Moriz Instant Self-Tanning Mousse worth noting.
 
Looking at its moisturizing profile, we found that it doesn’t contain any occlusive ingredients, potentially allowing the moisture attracted to the skin by humectants to evaporate. Therefore, if it’s used as the only moisturizer in a routine, it’s recommended to pair it with one that contains at least some occlusive ingredients, such as oils, butters, or silicones.
 
📌 Fact check. At CreamScan, we are committed to accuracy and fairness. If you spot any errors or something that doesn’t seem right, please click here to let us know. We regularly update the ingredient lists and monitor the latest research on ingredient efficacy to ensure that our information remains as complete and precise as possible. The information provided here is for informational purposes only and does not substitute professional advice. We do not guarantee the efficacy or safety of any product, as individual results may vary.

 

Ingredient Breakdown

Est. % Ingredient Origin Functions
70
9
6
4
3
2.5
1
1
1
0.3
0.3
0.3
0.1
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Dihydroxyacetone
Function:
Origin:
Propylene Glycol
Function:
Origin:
Ethoxydiglycol
Function:
Origin:
Polysorbate 20
Function:
Origin:
Cocamidopropyl Betaine
Function:
Origin:
Fragrance
Function:
Origin:
Citric Acid
Function:
Origin:
2-Bromo-2-Nitropropane-1,3-Diol
Function:
Origin:
Coumarin
Function:
Origin:
Citronellol
Function:
Origin:
Alpha-Isomethyl Ionone
Function:
Origin:
Butylphenyl Methylpropional
Function:
Origin:
Eugenol
Function:
Origin:
Red 40 (CI 16035)
Function:
Origin:
Yellow 5 (CI 19140)
Function:
Origin:
Blue 1 (CI 42090)
Function:
Origin:

Ratings

All humectants
10.0
6
4
Benchmark
10
All occlusives
0.0
None
Benchmark
20
Moisturizing rating
5.0
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 10 10
10.0
6
4
Occlusivity All occlusives 0.0 20
0.0
None
Moisturizing rating
5.0
Ingredient Est. % Benchmark Humectancy
6
4
All humectants 10 10
10
All humectants
10.0
6
4
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
None
All occlusives 0.0 20
0.0
All occlusives
0.0
None
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
None
Total
0
None
Anti-wrinkle rating
0
Ingredient Est. % Benchmark
Rich in Antioxidants
None
All antioxidants 0 3 No
All antioxidants
0
None
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
None
All soothing 0 5 No
All soothing
0
None
Benchmark
5

Ingredients explained

Water
Est. %70
Function
Origin
WaterThe most used ingredient in skincare. Its concentration defines the product texture: rich creams may have about 50% of water while a light jelly about 90%. Water doesn’t moisturize the skin by itself and is used in skincare as a solvent for other ingredients.
Dihydroxyacetone
Est. %9
Function
Origin
DihydroxyacetoneA self-tanning agent that works by reacting with the dead skin cells on the surface of the skin to produce the desired tan pigmentation. This pigment can last for several days and up to several weeks.
Propylene Glycol
Est. %6
Function
Origin
Propylene GlycolA clear, thick, odorless liquid of synthetic origin. Its main function is to stabilize cosmetic products exposed to varying temperatures. It is also a moderately strong humectant with similar properties to glycerin.
Ethoxydiglycol
Est. %4
Function
Origin
EthoxydiglycolA type of alcohol with humectant moisturizing properties. It also acts as a solvent, since it mixes well with a variety of other compounds, including water and even some oils.
Polysorbate 20
Est. %3
Function
Origin
Polysorbate 20A viscous, amber-colored liquid that functions as a solubilizer to disperse small amounts of oil into a large water phase. Polysorbate 20 is frequently used to solubilize fragrance oils into water-based emulsions.
Cocamidopropyl Betaine
Est. %2.5
Function
Origin
Cocamidopropyl BetaineA mildly cleansing ingredient derived from coconut. It also produces the foam that tells us our soap is actually working to remove dirt and oils.
Fragrance
Est. %1
Function
Origin
FragranceUnder trade secret law, manufacturers have the right not to disclose what exactly went into the fragrance and use the unspecific word Fragrance or Parfum instead. Many fragrances are highly allergenic.
Citric Acid
Est. %1
Function
Origin
Citric AcidA gently exfoliating AHA that helps to remove the top layer of dead skin cells. In comparison to other AHAs, citric acid has been shown to be one of the least effective. It is also very commonly used as a stabilizing and pH-controlling agent.
2-Bromo-2-Nitropropane-1,3-Diol
Est. %1
Function
Origin
2-Bromo-2-Nitropropane-1,3-Diol
Coumarin
Est. %0.3
Function
Origin
Coumarin

A plant-based fragrant compound that occurs in sweet-smelling grass, sweet woodruff, and sweet clover. It has a sweet and vanilla-like scent in high concentrations and a similar scent to freshly mowed grass in low concentrations.

Citronellol
Est. %0.3
Function
Origin
Citronellol

A fragrant compound found naturally in many essential oils (mainly lemongrass). It can have a lemon or a rose scent. People with sensitive skin should try to avoid products with citronellol, or at least do a patch test before using it.

Alpha-Isomethyl Ionone
Est. %0.3
Function
Origin
Alpha-Isomethyl IononeA fragrance ingredient that is supplied as a pale, yellow liquid. The scent it emits is very clean and features notes of violet and orris. Alpha-isomethyl is also used as a flavoring agent in lip care products and even in some foods and drinks.
Butylphenyl Methylpropional
Est. %0.1
Function
Origin
Butylphenyl Methylpropional

A synthetic fragrance ingredient used to recreate the scent of lilies, this ingredient also features fresh, green, and powdery notes. Butylphenyl Methylpropional was recently labeled as Toxic to Reproduction in the EU and will be banned in 2022.

Eugenol
Est. %0.3
Function
Origin
Eugenol

A fragrant liquid that can be found naturally in the essential oils derived from cloves, cinnamon, basil, and bay leaf. It has a spicy and warm scent. People with sensitive skin should consider doing a patch test first, as it is a potential irritant.

Red 40 (CI 16035)
Est. %0.3
Function
Origin
Red 40 (CI 16035)A colorant that also goes by the name of Allura Red AC or FD&C Red 40. This ingredient is an approved colorant for skincare, food, and even tattoo inks. The color produced by Red 40 (CI 16035) is a jewel-tone red with yellow undertones.
Yellow 5 (CI 19140)
Est. %0.3
Function
Origin
Yellow 5 (CI 19140)A bright yellow colorant that is often also listed as FD&C Yellow 5.
Blue 1 (CI 42090)
Est. %0.3
Function
Origin
Blue 1 (CI 42090)A synthetic dye commonly known as Brilliant Blue FCF that produces rich blue colors for various cosmetic uses. FD&C Blue #1 can also be found in foods, medications, and dietary supplements, as it is considered non-toxic and safe for use.