Dermalogica Circular Hydrating Serum Versus Kiehl's Vital Skin-Strengthening Hyaluronic Acid Super Serum

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1,2-Hexanediol is a multi-tasker ingredient. It acts as a preservative to increase shelf-life and can aid other preservatives in preventing microbe growth. 1,2-Hexanediol also helps the skin retain moisture as a humectant.

Xylitylglucoside is created from xylitol and glucose, two humectants.

Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:

We don't have a description for Hydroxyethyl Urea.

Panthenol is a common ingredient that helps hydrate and soothe the skin. It can be found naturally in our skin and hair.

Hydroxyacetophenone is antioxidant and helps with skin conditioning.

Lactic Acid is an AHA that is derived from fermenting lactose, a carbohydrate from milk. It removes the top layer of old and dead skin cells and helps increase cell turnover.

Hyaluronic acid is naturally found in healthy skin. It is a humectant, meaning it draws moisture to your skin.

Sodium Hyaluronate is hyaluronic acid's salt form. It is commonly derived from the sodium salt of hyaluronic acid.

We don't have a description for Dunaliella Salina Extract.

Avena Sativa Kernel Extract is is derived from colloidal oatmeal. Besides being a healthy breakfast, oats have many benefits in skincare too.

Citrus Aurantium Bergamia Fruit Oil is the oil from the bergamot orange. This bergamot is native to Italy.

Citrus Paradisi Peel Oil is the volatile oil expressed from the peel of the Grapefruit, Citrus paradisi, Rutaceae.

Citrus Limon Peel Oil is created from the peels of the lemon. It is used to add a lemon-scent to products. Lemon peel oil also has antibacterial, antifungal, and antioxidant properties. However, it may also cause phototoxicity and sensitize skin.

Santalum Album Oil is created from the Santalum album, or the East Indian sandalwood tree. This oil has fragrance and masking properties due to its unique scent.

Laminaria Digitata Extract comes from the dark brown seaweed, Laminaria Digitata. It is a potent antioxidant, which also provides soothing and hydrating benefits.

Jasminum Sambac Flower Extract is a fragrance.

Chondrus Crispus Extract comes from a red algae native to the northern Atlantic coasts of Europe and North America.

We don't have a description for Gigartina Stellata Extract.

This ingredient comes from a brown kelp called Macrocystis pyrifera. It is rich in antioxidants and can help hydrate skin.

Prunus Amygdalus Dulcis Oil comes from the sweet almond, a tree native to Iran. This oil has no fragrance and is non-volatile.

We don't have a description for Lithothamnion Calcareum Extract.

Citrus Aurantium Dulcis Oil comes from the bitter orange, an orange native to Southeast Asia.

Cupressus Sempervirens Oil is an oil.

We don't have a description for Cistus Ladaniferus Leaf/Stem Extract.

Juniperus Virginiana Oil is the volatile oil obtained from the fruits and leaves of the Red Cedar, Juniperus virginiana L., Cupressaceae

We don't have a description for Rosmarinus Officinalis Flower/Leaf/Stem Extract.

Tagetes Minuta Flower Oil is a fragrance and is an oil.

Rosa Damascena Flower is the Damask rose.

Hydrolyzed Rice Protein is protein extracted from rice. This ingredient is rich in antioxidants and peptides.

Pentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.

Sodium PCA is the sodium salt of pyroglutamic acid and is naturally occurring on human skin.

This ingredient is created from dehydrating xylitol in acidic conditions. Xylitol is a famous sugar and humectant.

Xylitol is a humectant and prebiotic. It can help with dry skin.

Polyglutamic Acid is made up many glutamic acids chained together. It is created from bacterial fermentation.

Lactobacillus Ferment is created by fermenting the Lactobacillus bacteria. It helps keep our skin's natural barrier and microbiome healthy.

Lysine HCl is an alpha amino acid salt.

Betaine is a common humectant (a substance that promotes retention of moisture). It's known to be gentle on the skin and can help balance hydration.

Sclerotium Gum is a polysaccharide gum made by the fungus, Sclerotium rolfssii. It is similar to xanthan gum.

Sodium Lactate is the sodium salt of lactic acid, an AHA. It is a humectant and used to adjust the pH of a product.

PCA is derived from amino acids and is naturally found in our skin's barrier.

Glucose is a simple sugar and is the most important source of energy in all organisms.

Serine is an amino acid naturally found in our body. Our bodies use amino acids to create protein.

Alanine is an amino acid and is already found in the human body.

Glycine is an amino acid that helps build proteins. It is already present in our skin as our bodies produce them naturally.

We don't have a description for Silanetriol.

Pantolactone is a synthetically created humectant.

Glutamic Acid is an amino acid that is found in all living organisms. Our bodies use this to help nerve cells in the brain communicate with other cells.

Threonine is an amino-acid. It helps hydrate the skin and has antioxidant benefits.

Arginine is an amino acid that is important for human development. Your body uses is it to produce hair keratin and skin collagen.

Proline is an amino-acid. It helps moisturize the skin and plays an important role in creating proteins.

Xanthan gum is used as a stabilizer and thickener within cosmetic products. It helps give products a sticky, thick feeling - preventing them from being too runny.

Tetrasodium Glutamate Diacetate is a chelating agent. Chelating agents help prevent metal ions from binding to other ingredients. This helps prevent unwanted effects and reactions from a product. These metal ions may come from water and are found in miniscule amounts.

Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.

Sorbitan Isostearate is an emulsifer and cleaning agent. It is created from isostearic acid and sorbitol.

Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).

Sodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.

This is a synthetic polymer. It helps improve the texture of products by adding thickness and gel-like feel.

We don't have a description for Amylopectin.

Hydroxyethylcellulose is used to improve the texture of products. It is created from a chemical reaction involving ethylene oxide and alkali-cellulose. Cellulose is a sugar found in plant cell walls and help give plants structure.

Sodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

Limonene is a fragrance that adds scent and taste to a formulation.

Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.