Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ Review

Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++
3.7
/ 10
Moisturizing
7.2 Humectancy icon Humectancy
0.2 Occlusivity icon Occlusivity
Rich
in Antioxidants
50
SPF icon
SPF
Review

Does Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ Work?

 
According to CreamScan AI's analysis of the ingredient list, here’s what Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ has to offer:
 
  • Light moisturizing. It has a moisturizing rating of 3.7 out of 10.
  • Antioxidant protection.
  • Very high sun protection for prolonged sun exposure, such as spending the day at the beach, hiking, or outdoor sports.

Key Benefits of Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++

 
These are the key benefits you can expect from using Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++:
 

Lightweight Moisturizer Well-Suited for Oily Skin

According to CreamScan analysis, Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ is lightly moisturizing, with a moisturizing rating of 3.7 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a low occlusivity of 0.2 out of 10 and a high humectancy of 7.2 out of 10, primarily due to the high content of Butylene Glycol (est. ≈4.0%) and Pentylene Glycol (est. ≈2.0%).

This humectant-rich product, when used alone as a moisturizer, is well-suited for oily skin, providing moderate hydration in a lightweight, fast-absorbing formula with a minimal amount of occlusive ingredients.

It can also be a good option for people with normal skin who prefer lightweight moisturizers.

A Humectant Enhancement for Any Skincare Routine

But it’s not limited to oily skin - such a humectant enhancement 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.

Rich in Skin-Protecting Antioxidants

We estimate that Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ is rich (> 3%) in antioxidants, specifically 3-O-Ethyl Ascorbic Acid (est. ≈1.5%), Arbutin (est. ≈0.3%), Sodium Hyaluronate (est. ≈0.3%), and others.

A key benefit of antioxidants is their ability to reduce oxidative stress caused by free radicals and therefore prevent accelerated skin aging. Studies also show that antioxidants can protect against environmental damage such as UV radiation and pollution, and help reduce inflammation and skin redness.

Very High Sun Protection for Prolonged Sun Exposure, All Skin Types, and High-risk Conditions

With an SPF of 50, Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ provides very high sun protection, suitable for intense sun exposure in tropical climates, beach vacations, or high-altitude environments.

This level of SPF blocks 98% or more of UVB rays, offering the highest level of defense against sunburn. Broad-spectrum formulations also provide strong protection against UVA rays, which are responsible for skin aging, pigmentation, and DNA damage.

For optimal protection, choose products labeled broad-spectrum to ensure defense against both UVA rays, which contribute to skin aging and pigmentation, and UVB rays that cause sunburn.

This level of SPF is ideal for all skin types, particularly fair, sensitive, or post-treatment skin (e.g., after laser or chemical procedures). It is also highly recommended for individuals at greater risk of skin cancer.

For extended outdoor activities or water exposure, choose a water-resistant formula and reapply every two hours for maximum effectiveness.

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

Things to Be Aware Of: Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++

 
CreamScan AI identified a few things to consider before adding Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ to your skincare routine:
 

Questionable anti-wrinkle efficacy

If one of your main reasons for choosing Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ is its potential anti-aging effects, please note that, according to CreamScan analysis, it currently has a zero anti-wrinkle rating.

It contains 3-O-Ethyl Ascorbic Acid, an ingredient often marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of 3-O-Ethyl Ascorbic Acid provide insufficient evidence of its efficacy according to CreamScan Research Evaluation Standards.

While this does not categorically exclude the possibility that 3-O-Ethyl Ascorbic Acid may reduce wrinkles, its efficacy is not supported by convincing, vehicle-controlled, double-blind clinical studies - at least none that were accessible to the CreamScan team at the time of publication.

Therefore, this ingredient does not generate the anti-wrinkle rating.

Moisturizers, when used regularly, are proven to prevent wrinkle formation and even reduce existing wrinkles. Therefore, this product, like any other moisturizer, can deliver some anti-wrinkle effects through its moisturizing action.

Please refer to the Ratings section below for details of the anti-wrinkle rating calculation.

Pros & Cons of Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++

 
Here’s an overview of the pros and cons of Ishizawa Labs UV-Yohou Moisturizing UV Serum SPF 50+ PA++++ to help you decide if it’s the right choice for your skincare routine:
 

Pros:

  • When used alone: Provides humectant-rich moisturizing well-suited for oily skin
  • As part of a routine: A humectant moisturizing enhancement, beneficial for any skin type
  • Lightweight texture
  • Rich in antioxidants that combat oxidative stress associated with accelerated skin aging and defend against environmental damage
  • Provides very high sun protection, ideal for intense sun exposure in tropical climates, high-altitude environments, and beach vacations, suitable for all skin types

Cons: 

  • Questionable anti-wrinkle efficacy

Ingredients

Est. % Ingredient Origin Functions
75
6
4
3
2
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Octinoxate
Function:
Origin:
Butylene Glycol
Function:
Origin:
Diethylamino Hydroxybenzoyl Hexyl Benzoate
Function:
Origin:
Pentylene Glycol
Function:
Origin:
3-O-Ethyl Ascorbic Acid
Function:
Origin:
Ceramide AP
Function:
Origin:
Ceramide NS
Function:
Origin:
Ceramide NP
Function:
Origin:
Arbutin
Function:
Origin:
Sodium Hyaluronate
Function:
Origin:
Hydrolyzed Collagen
Function:
Origin:
Citrus Grandis (Grapefruit) Seed Extract
Function:
Origin:
Malpighia Emarginata Fruit Extract
Function:
Origin:
Salvia Officinalis (Sage) Extract
Function:
Origin:
Scutellaria Baicalensis Root Extract
Function:
Origin:
Chamomilla Recutita (Matricaria) Flower
Function:
Origin:
Aloe Barbadensis Leaf Juice
Function:
Origin:
Corydalis Ambigua Bark/Root Extract
Function:
Origin:
Citrus Aurantium Dulcis (Orange) Peel Oil
Function:
Origin:
PEG-5 Glyceryl Trioleate
Function:
Origin:
PEG-Crosspolymer
Function:
Origin:
Hydrogenated Polyisobutene
Function:
Origin:
Sodium Hydroxide
Function:
Origin:
Tocopherol
Function:
Origin:
EDTA
Function:
Origin:
Phenoxyethanol
Function:
Origin:

Ratings

All humectants
7.2
4
2
0.3
0.3
0.3
0.3
Benchmark
10
All occlusives
0.3
0.3
Benchmark
20
Moisturizing rating
3.7
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 7.2 10
7.2
4
2
0.3
0.3
0.3
0.3
Occlusivity All occlusives 0.3 20
0.2
0.3
Moisturizing rating
3.7
Ingredient Est. % Benchmark Humectancy
4
2
0.3
0.3
0.3
0.3
All humectants 7.2 10
7.2
All humectants
7.2
4
2
0.3
0.3
0.3
0.3
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
0.3
All occlusives 0.3 20
0.2
All occlusives
0.3
0.3
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
n/a
- 1.5 -
Total
0
3-O-Ethyl Ascorbic Acid
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
1.5
Anti-wrinkle rating
0
Ingredient Est. % Benchmark
Rich in Antioxidants
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
All antioxidants 3.6 3 Rich in antioxidants
All antioxidants
3.6
3-O-Ethyl Ascorbic Acid
1.5
Arbutin
0.3
Sodium Hyaluronate
0.3
Malpighia Emarginata Fruit Extract
0.3
Salvia Officinalis (Sage) Extract
0.3
Scutellaria Baicalensis Root Extract
0.3
Aloe Barbadensis Leaf Juice
0.3
Tocopherol
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
0.3
0.3
0.3
All soothing 0.9 5 No
All soothing
0.9
0.3
0.3
0.3
Benchmark
5

Ingredients explained

Water
Est. %75
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.
Octinoxate
Est. %6
Function
Origin
OctinoxateA chemical sunscreen also known as ethylhexyl methoxycinnamate. It protects against UVB, which causes the skin to burn and tan and can lead to certain types of skin cancers. For broad-spectrum protection claims, octinoxate should be paired with a UVA sunscreen.
Butylene Glycol
Est. %4
Function
Origin
Butylene Glycol

A clear, colorless liquid humectant that draws moisture to the skin. The humectancy of butylene glycol, owed to its two hydroxyl groups, is quite considerable, although not as powerful as glycerin, which contains three hydroxyl groups.

Diethylamino Hydroxybenzoyl Hexyl Benzoate
Est. %3
Function
Origin
Diethylamino Hydroxybenzoyl Hexyl Benzoate
Pentylene Glycol
Est. %2
Function
Origin
Pentylene Glycol

A naturally or synthetically derived preservative that exhibits effective antifungal and antibacterial traits. It also acts as a booster for more traditional preservatives. Pentylene glycol can also serve as a moisturizing humectant and solvent.

3-O-Ethyl Ascorbic Acid
Est. %1.5
Function
Origin
3-O-Ethyl Ascorbic AcidA derivative of vitamin C. Its stability in skincare formulations is better than ascorbic acid’s, although clinical studies are yet to indicate whether it has the same collagen-boosting benefits.
Ceramide AP
Est. %0.3
Function
Origin
Ceramide APPreviously called Ceramide 6 II, Ceramide AP is one of the most common ceramides in the skin. Research has shown that dry, flaky skin has significantly less Ceramide AP. Its application helps to treat dry skin by restoring balance in the skin lipids.
Ceramide NS
Est. %0.3
Function
Origin
Ceramide NSA wax-like lipid natural to the skin’s lipid matrix. It is less frequently used but, in combination with other ceramides, can help to restore balance in the skin’s lipid barrier.
Ceramide NP
Est. %0.3
Function
Origin
Ceramide NPAlso known as ceramide 3, it is the most common ceramide in our skin. It helps to restore the skin’s lipid barrier and alleviate the symptoms of dry and cracked skin. Research has shown that skin suffering from conditions such as AD lacks ceramides.
Arbutin
Est. %0.3
Function
Origin
ArbutinOne of the few potent anti-pigment compounds found naturally in bearberry or cranberry leaves. When applied to the skin, this ingredient converts into hydroquinone, with tyrosinase inhibiting effects.
Sodium Hyaluronate
Est. %0.3
Function
Origin
Sodium Hyaluronate

A sodium salt of famous hyaluronic acid. A potent humectant that hydrates the skin, supports collagen function, and fills out small wrinkles. Sodium hyaluronate also offers soothing and antioxidant properties.

Hydrolyzed Collagen
Est. %0.3
Function
Origin
Hydrolyzed Collagen

A humectant, film-forming, and emollient mixture of various proteins and peptides that were created by cutting the huge molecules of normal collagen into smaller pieces for better absorption. It also has some antioxidant properties.

Citrus Grandis (Grapefruit) Seed Extract
Est. %0.3
Function
Origin
Citrus Grandis (Grapefruit) Seed Extract

An extract from the seeds and pulp of pomelo. It contains vitamin E, flavonoids, tannins, and limonoids, and has antioxidant, soothing, and astringent properties. The seeds mostly contain emollient fatty oil.

Malpighia Emarginata Fruit Extract
Est. %0.3
Function
Origin
Malpighia Emarginata Fruit Extract

Description is coming soon

Salvia Officinalis (Sage) Extract
Est. %0.3
Function
Origin
Salvia Officinalis (Sage) Extract
Scutellaria Baicalensis Root Extract
Est. %0.3
Function
Origin
Scutellaria Baicalensis Root ExtractA powerful antioxidant, soothing, and astringent extract derived from the roots of Baikal/Chinese skullcap. It contains various unique flavonoids that are believed to soothe irritated and inflamed skin and protect from UV-induced oxidative damage.
Chamomilla Recutita (Matricaria) Flower
Est. %0.3
Function
Origin
Chamomilla Recutita (Matricaria) Flower
Aloe Barbadensis Leaf Juice
Est. %0.3
Function
Origin
Aloe Barbadensis Leaf JuiceA gelatinous juice from Aloe vera leaves that acts as a powerful humectant, emollient, and antioxidant. It contains enzymes, amino acids, vitamins, and minerals that soothe irritated skin and have wound-healing and anti-inflammatory properties.
Corydalis Ambigua Bark/Root Extract
Est. %0.3
Function
Origin
Corydalis Ambigua Bark/Root Extract
Citrus Aurantium Dulcis (Orange) Peel Oil
Est. %0.3
Function
Origin
Citrus Aurantium Dulcis (Orange) Peel Oil

An essential oil derived from the peels of the sweet orange. It is commonly used as a fragrance because of its pleasant, citrusy scent. The main constituent of the essential oil is limonene (up to 96%).

PEG-5 Glyceryl Trioleate
Est. %0.3
Function
Origin
PEG-5 Glyceryl Trioleate
PEG-Crosspolymer
Est. %0.3
Function
Origin
PEG-Crosspolymer
Hydrogenated Polyisobutene
Est. %0.3
Function
Origin
Hydrogenated PolyisobuteneA viscous liquid that makes a great oil base due to its smooth sensorial profile. It has emollient features, including good spreadability and little tack upon application. It also has the added benefit of being able to thicken products.
Sodium Hydroxide
Est. %0.3
Function
Origin
Sodium Hydroxide

An ingredient that is able to bring the pH of a product up, thereby making it less harsh on the skin.

Tocopherol
Est. %0.3
Function
Origin
Tocopherol

Simply another name for vitamin E. Tocopherol is a fantastic ingredient and especially beneficial for dry and inflamed skin. It has occlusive moisturizing, emollient, antioxidant, and photoprotective properties.

EDTA
Est. %0.3
Function
Origin
EDTAA synthetically produced ingredient that binds certain metal ions. It can help prevent product discoloration or poor performance in rinse-off products used in 'hard' water.
Phenoxyethanol
Est. %0.3
Function
Origin
PhenoxyethanolThe most frequently used preservative in skincare. It is a clear, oil-like liquid synthetic substance that protects products from harmful bacteria and yeast, whilst still leaving skin microflora unharmed. It is confirmed by research to be harmless.