Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.

You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!

Learn more about Water

Butylene Glycol

Humectant, Masking, Skin Conditioning

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

Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.

Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.

Learn more about Butylene Glycol

Propanediol

Solvent

Propanediol is an all-star ingredient. It softens, hydrates, and smooths the skin.

It’s often used to:

Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.

Learn more about Propanediol

Bisabolol

Masking, Skin Conditioning, Soothing

Bisabolol is famous for its skin soothing properties. It does this by blocking inflammatory signals, helping to reduce your body's reaction to irritation.

This ingredient also interferes with the process of hyperpigmentation. This can help with reducing dark spots and uneven tone.

Bisabolol is an antioxidant. Antioxidants help fight free-radicals. Free-radicals are molecules that may damage your skin cells. By fighting these free-radicals, Bisabolol may slow down signs of aging.

Studies have shown Bisabolol to have antimicrobial properties and may be a fungicide. These properties help preserve a product's shelf life.

All these properties makes bisabolol a great skin barrier helper ingredient.

Bisabolol also helps the absorption of other ingredients.

Note: Synthetic Bisabolol has been shown to be less effective.

Learn more about Bisabolol

Tocopheryl Acetate

Antioxidant, Skin Conditioning

Tocopheryl Acetate is AKA Vitamin E. It is an antioxidant and protects your skin from free radicals. Free radicals damage the skin by breaking down collagen.

One study found using Tocopheryl Acetate with Vitamin C decreased the number of sunburned cells.

Tocopheryl Acetate is commonly found in both skincare and dietary supplements.

Learn more about Tocopheryl Acetate

Methyl Gluceth-20

Humectant, Moisturising

Methyl Gluceth-20 is a humectant. Humectants help draw moisture from the air to your skin.

It is created by combining polyethylene glycol with glucose.

Glycerin

Humectant, Skin Conditioning, Skin Protecting

Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.

A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.

As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.

Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.

Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.

In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.

This ingredient is organic, colorless, odorless, and non-toxic.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

Learn more about Glycerin

Lecithin

Emollient, Emulsifying, Skin Conditioning

Lecithin is a term for a group of substances found in the cell membranes of plants, animals, and humans. They are made up of mixture of phospholipids.

This ingredient has emollient and emulsifying properties.

As an emollient, lecithen helps soften the skin and creates a barrier to keep moisture in.

As an emulsifier, it also helps prevent water and oil ingredients from separating. Lecithin can also help ingredients be better absorbed by the skin.

This is because the phospholipids in lecithin produce liposomes. Liposomes help other ingredients get through the skin barrier.

Depending on the source of this ingredient, lecithin may not be fungal acne safe. This is because some sources of lecithin come from soybean oil, which may feed the malassezia yeast that feeds fungal acne.

We recommend reaching out to the brand you are purchasing from to inquire about the source of their lecithin.

Learn more about Lecithin

Xanthan Gum

Emulsifying, Emulsion Stabilising, Gel Forming

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.

On the technical side of things, xanthan gum is a polysaccharide - a combination consisting of multiple sugar molecules bonded together.

Xanthan gum is a pretty common and great ingredient. It is a natural, non-toxic, non-irritating ingredient that is also commonly used in food products.

Learn more about Xanthan Gum

Carbomer

Emulsion Stabilising, Gel Forming

Carbomer is a polymer of acrylic acid. Its main role is to create a gel consistency.

A high amount of carbomer can cause pilling or balling up of products. Don't worry, most products contain 1% or less of carbomer.

Phenoxyethanol

Preservative

Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.

It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.

Ingredient Ratings

Here's what our community thinks of the ingredients in these products.

Alto Advanced Defense and Repair Serum

Advanced Night Repair Synchronized Multi-Recovery Complex Serum

When to use

SkinBetter Science Alto Advanced Defense and Repair Serum 71 ingredients

Estée Lauder Advanced Night Repair Synchronized Multi-Recovery Complex Serum 43 ingredients

131 Routines

76% use in am

24% use in pm

99% use every day

When to use See routines that use it ->

621 Routines

19% use in am

81% use in pm

89% use every day

When to use See routines that use it ->

Reviews

Here's what our community thinks

SkinBetter Science Alto Advanced Defense and Repair Serum 71 ingredients

2.5 /5

from 2 ratings

Broke Me Out (2) Expensive (2) Doesn't Work (1)

☁️Holly☁️

6 months ago

Review

Expensive. Not as effective as Skinceuticals vitamin c. Has a noticeable yellow tint, despite it using a vitamin c derivative. I don’t know WHY, but I had a gut feeling this broke me out. This is a serum-moisturizer like texture, and I found that it pilled. Kind of a waste of my money :/

#expensive

#broke me out

#pilling

#doesn't work

SkinBetter Science

Alto Advanced Defense and Repair Serum

Lauren Rollins-Campbell

9 months ago

Review

This makes me break out!

#expensive

#broke me out

#irritating

SkinBetter Science

Alto Advanced Defense and Repair Serum

Estée Lauder Advanced Night Repair Synchronized Multi-Recovery Complex Serum 43 ingredients

4.7 /5

from 9 ratings

Hydrating (5) Works Well (5) Expensive (4)

NSmith

1 year ago

Review

Received a sample with purchase at Ulta. The serum feels nice, but ultimately is not worth the money. There are other products that can do the same for less.

#expensive

#sticky

Estée Lauder

Advanced Night Repair Synchronized Multi-Recovery Complex Serum

Valerija

8 months ago

Review

Very hydrating serum, leaves my skin super silky and helps with texture over time due to Bifida Ferment Lysate. I will not repurchase though because nowadays there are cheaper Korean alternatives and I do not need such hydration at the moment.

#expensive

#hydrating

#light

#light scent

Estée Lauder

Advanced Night Repair Synchronized Multi-Recovery Complex Serum