OSEA Hyaluronic Sea Serum Review

OSEA Hyaluronic Sea Serum
3.2
/ 10
Moisturizing
6.5 Humectancy icon Humectancy
0.0 Occlusivity icon Occlusivity
Rich
in Antioxidants
Review

Does OSEA Hyaluronic Sea Serum Work?

 
According to CreamScan AI's analysis of the ingredient list, here’s what OSEA Hyaluronic Sea Serum has to offer:
 
✅ Light moisturizing. It has a moisturizing rating of 3.2 out of 10.
✅ Antioxidant protection

  

Key Benefits of OSEA Hyaluronic Sea Serum

 
These are the key benefits you can expect from using OSEA Hyaluronic Sea Serum:
 

🔵 Lightweight Purely Humectant Moisturizer Well-Suited for Oily Skin

According to CreamScan analysis, OSEA Hyaluronic Sea Serum is lightly moisturizing, with a moisturizing rating of 3.2 out of 10.

Is it more humectant or occlusive? Purely humectant. It has zero occlusivity (we didn't find any occlusive ingredients on the ingredient list) and a high humectancy of 6.5 out of 10, primarily due to the high content of Undaria Pinnatifida Extract (est. ≈3.0%) and Sodium Hyaluronate (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 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 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 OSEA Hyaluronic Sea Serum is rich (> 3%) in antioxidants, specifically Macrocystis Pyrifera (Kelp) Extract (est. ≈4.0%) and Sodium Hyaluronate (est. ≈2.0%).

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.

📌 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: OSEA Hyaluronic Sea Serum

 
CreamScan AI identified a few things to consider before adding OSEA Hyaluronic Sea Serum 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 OSEA Hyaluronic Sea Serum 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 OSEA Hyaluronic Sea Serum

 
Here’s an overview of the pros and cons of OSEA Hyaluronic Sea Serum 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
 

⭕ Cons: 

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

Summary: OSEA Hyaluronic Sea Serum

 
Based on the ingredient list analysis, CreamScan AI suggests that OSEA Hyaluronic Sea Serum
, when used alone, delivers lightweight, humectant-rich moisturizing that is well-suited for oily skin. As part of a moisturizing routine, it provides a humectant enhancement, beneficial for all skin types.
 
With its high antioxidant content, OSEA Hyaluronic Sea Serum helps protect against free radical damage and offers multiple benefits for all skin types, including preventing premature aging, defending against environmental damage, and calming inflammation.
 
That said, there are some things about OSEA Hyaluronic Sea Serum 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.

 

Ingredients

Est. % Ingredient Origin Functions
80
6
4
3
2
1.5
0.3
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Gigartina Skottsbergii Extract
Function:
Origin:
Macrocystis Pyrifera (Kelp) Extract
Function:
Origin:
Undaria Pinnatifida Extract
Function:
Origin:
Sodium Hyaluronate
Function:
Origin:
Hyaluronic Acid
Function:
Origin:
Potassium Sorbate
Function:
Origin:
Citric Acid
Function:
Origin:
Lonicera Caprifolium (Honeysuckle) Extract
Function:
Origin:
Lonicera Japonica (Honeysuckle) Leaf Extract
Function:
Origin:
Copper Chlorophyll
Function:
Origin:

Ratings

All humectants
6.5
3
2
1.5
Benchmark
10
All occlusives
0.0
None
Benchmark
20
Moisturizing rating
3.2
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 6.5 10
6.5
3
2
1.5
Occlusivity All occlusives 0.0 20
0.0
None
Moisturizing rating
3.2
Ingredient Est. % Benchmark Humectancy
3
2
1.5
All humectants 6.5 10
6.5
All humectants
6.5
3
2
1.5
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
4
2
1.5
All antioxidants 7.5 3 Rich in antioxidants
All antioxidants
7.5
Macrocystis Pyrifera (Kelp) Extract
4
Sodium Hyaluronate
2
Hyaluronic Acid
1.5
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
None
All soothing 0 5 No
All soothing
0
None
Benchmark
5

Ingredients explained

Water
Est. %80
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.
Gigartina Skottsbergii Extract
Est. %6
Function
Origin
Gigartina Skottsbergii Extract
Macrocystis Pyrifera (Kelp) Extract
Est. %4
Function
Origin
Macrocystis Pyrifera (Kelp) ExtractAn extract obtained from Giant kelp that is rich in gel-forming and thickening polysaccharides.
Undaria Pinnatifida Extract
Est. %3
Function
Origin
Undaria Pinnatifida ExtractAn extract of Wakame, an edible seaweed from Asian countries. It contains a moisturizing and thickening agal polysaccharide called fucoidan.
Sodium Hyaluronate
Est. %2
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.

Hyaluronic Acid
Est. %1.5
Function
Origin
Hyaluronic Acid

A potent, skin-identical humectant moisturizing ingredient that is able to bind water 1000 times its own weight. The anti-aging benefits of hyaluronic acid are due to its ability to stimulate the synthesis of collagen in the skin.

Potassium Sorbate
Est. %0.3
Function
Origin
Potassium SorbateA preservative widely used in food and personal care products, available from natural sources or synthetically produced. Potassium sorbate works by inhibiting the growth of yeasts, molds, and some bacteria.
Citric Acid
Est. %0.3
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.
Lonicera Caprifolium (Honeysuckle) Extract
Est. %0.3
Function
Origin
Lonicera Caprifolium (Honeysuckle) Extract
Lonicera Japonica (Honeysuckle) Leaf Extract
Est. %0.3
Function
Origin
Lonicera Japonica (Honeysuckle) Leaf Extract
Copper Chlorophyll
Est. %0.3
Function
Origin
Copper Chlorophyll