Kiehl's Rare Earth Pore Refining Tonic Review

Kiehl's Rare Earth Pore Refining Tonic
3.6
/ 10
Moisturizing
7.3 Humectancy icon Humectancy
0.0 Occlusivity icon Occlusivity
Review

Does Kiehl's Rare Earth Pore Refining Tonic Work?

 
According to CreamScan AI's analysis of the ingredient list, here’s what Kiehl's Rare Earth Pore Refining Tonic has to offer:
 
✅ Light moisturizing. It has a moisturizing rating of 3.6 out of 10.

  

Key Benefits of Kiehl's Rare Earth Pore Refining Tonic

 
These are the key benefits you can expect from using Kiehl's Rare Earth Pore Refining Tonic:
 

🔵 Lightweight Purely Humectant Moisturizer Well-Suited for Oily Skin

According to CreamScan analysis, Kiehl's Rare Earth Pore Refining Tonic is lightly moisturizing, with a moisturizing rating of 3.6 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 7.3 out of 10, primarily due to the high content of Glycerin (est. ≈4.0%) and Propanediol (est. ≈3.0%).

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.

📌 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: Kiehl's Rare Earth Pore Refining Tonic

 
CreamScan AI identified a few things to consider before adding Kiehl's Rare Earth Pore Refining Tonic 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 Kiehl's Rare Earth Pore Refining Tonic 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 Kiehl's Rare Earth Pore Refining Tonic

 
Here’s an overview of the pros and cons of Kiehl's Rare Earth Pore Refining Tonic 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
 

⭕ Cons: 

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

Summary: Kiehl's Rare Earth Pore Refining Tonic

 
Based on the ingredient list analysis, CreamScan AI suggests that Kiehl's Rare Earth Pore Refining Tonic
, 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.
 
That said, there are some things about Kiehl's Rare Earth Pore Refining Tonic 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.

 

Ingredients

Est. % Ingredient Origin Functions
80
6
4
3
2
1
1
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Alcohol Denat.
Function:
Origin:
Glycerin
Function:
Origin:
Propanediol
Function:
Origin:
Silica
Function:
Origin:
Phenoxyethanol
Function:
Origin:
Zinc Oxide
Function:
Origin:
Methyl Methacrylate Crosspolymer
Function:
Origin:
Kaolin
Function:
Origin:
Zinc Gluconate
Function:
Origin:
Aloe Barbadensis Leaf
Function:
Origin:
Avena Sativa (Oat) Kernel Flour
Function:
Origin:
Menthoxypropanediol
Function:
Origin:
Hamamelis Virginiana (Witch Hazel) Water
Function:
Origin:
Allantoin
Function:
Origin:
Salicylic Acid
Function:
Origin:

Ratings

All humectants
7.3
4
3
0.3
Benchmark
10
All occlusives
0.0
None
Benchmark
20
Moisturizing rating
3.6
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 7.3 10
7.3
4
3
0.3
Occlusivity All occlusives 0.0 20
0.0
None
Moisturizing rating
3.6
Ingredient Est. % Benchmark Humectancy
4
3
0.3
All humectants 7.3 10
7.3
All humectants
7.3
4
3
0.3
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
0.3
All antioxidants 0.3 3 No
All antioxidants
0.3
Avena Sativa (Oat) Kernel Flour
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
0.3
0.3
0.3
0.3
0.3
All soothing 1.5 5 No
All soothing
1.5
0.3
0.3
0.3
0.3
0.3
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.
Alcohol Denat.
Est. %6
Function
Origin
Alcohol Denat.

Denatured alcohol is ethanol that contains additives that make it unsafe to consume. It is mainly used as a solvent and an antimicrobial agent. A major drawback to alcohol denat. is that it dries out the skin.

Glycerin
Est. %4
Function
Origin
Glycerin

The most popular moisturizing ingredient in the world. It is a powerful humectant – cheap yet very effective.

Propanediol
Est. %3
Function
Origin
PropanediolAn excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.
Silica
Est. %2
Function
Origin
SilicaA widely used cosmetic ingredient with the same chemical composition as the sand found on beaches. A common function of silica is its ability to control viscosity. In certain chemical forms, it can effectively thicken cream-style products.
Phenoxyethanol
Est. %1
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.
Zinc Oxide
Est. %1
Function
Origin
Zinc OxideA white mineral powder mainly used in skincare as a physical sunscreen. It protects against UVA light that leads to visible signs of aging, including wrinkles and fine lines. Zinc oxide can also be used as a colorant to enhance the whiteness of a product.
Methyl Methacrylate Crosspolymer
Est. %1
Function
Origin
Methyl Methacrylate CrosspolymerA synthetic ingredient that is used for bulking, film-forming, and controlling viscosity. It can absorb large amounts of water and oil and creates a network for other ingredients to live in.
Kaolin
Est. %0.3
Function
Origin
KaolinA type of mineral clay milled into a white, very fine powder. It is able to absorb sweat and oil, which then helps to keep the skin matte. The larger particles of kaolin are used in skin scrubs as an abrasive ingredient.
Zinc Gluconate
Est. %0.3
Function
Origin
Zinc GluconateOne of the most commonly used ingredients in anti-acne products. It is an organic salt of zinc that helps to combat microbial infections, soothes and heals inflamed pimples, and regulates hormones in the skin.
Aloe Barbadensis Leaf
Est. %0.3
Function
Origin
Aloe Barbadensis Leaf
Avena Sativa (Oat) Kernel Flour
Est. %0.3
Function
Origin
Avena Sativa (Oat) Kernel FlourA mild abrasive, finely milled oat kernel flour that is also used as a formula helper.
Menthoxypropanediol
Est. %0.3
Function
Origin
Menthoxypropanediol
Hamamelis Virginiana (Witch Hazel) Water
Est. %0.3
Function
Origin
Hamamelis Virginiana (Witch Hazel) WaterA fragrant, astringent essential water obtained by steeping and distilling the twigs and leaves of the witch hazel plant. It leaves the skin feeling tight and refreshed after application and helps with the healing of small cuts on the skin.
Allantoin
Est. %0.3
Function
Origin
AllantoinA fluffy, white powder that acts as a humectant due to its water-loving chemistry and as an exfoliant that helps to remove dead skin cells. It has also been shown to be very soothing to irritated and inflamed skin.
Salicylic Acid
Est. %0.3
Function
Origin
Salicylic AcidThis effective peeling and anti-inflammatory BHA is used as an anti-acne agent and works by breaking down the junctions between dead skin cells. This results in the peeling of dead skin and the unclogging of pores.