Living Proof Scalp Care Exfoliator Versus The INKEY List Glycolic Acid Exfoliating Scalp Scrub

Living Proof Scalp Care Exfoliator Versus The INKEY List Glycolic Acid Exfoliating Scalp Scrub

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Propanediol

Mandelic Acid

Glycolic Acid

Gluconolactone

Isopentyldiol

PPG-24-Glycereth-24

Saccharide Isomerate

Methyl Diisopropyl Propionamide

Gaultheria Procumbens Leaf Extract

Agave Tequilana Leaf Extract

Beta Vulgaris Root Extract

Pentylene Glycol

PPG-26-Buteth-26

Betaine

Gluconic Acid

Lysolecithin

Sclerotium Gum

Citric Acid

Pullulan

Cellulose Gum

Xanthan Gum

Hydroxyacetophenone

PEG-40 Hydrogenated Castor Oil

Sodium Citrate

Sodium Benzoate

Sodium Hydroxide

Parfum

Limonene

Water, Propanediol, Mandelic Acid, Glycolic Acid, Gluconolactone, Isopentyldiol, PPG-24-Glycereth-24, Saccharide Isomerate, Methyl Diisopropyl Propionamide, Gaultheria Procumbens Leaf Extract, Agave Tequilana Leaf Extract, Beta Vulgaris Root Extract, Pentylene Glycol, PPG-26-Buteth-26, Betaine, Gluconic Acid, Lysolecithin, Sclerotium Gum, Citric Acid, Pullulan, Cellulose Gum, Xanthan Gum, Hydroxyacetophenone, PEG-40 Hydrogenated Castor Oil, Sodium Citrate, Sodium Benzoate, Sodium Hydroxide, Parfum, Limonene

Hydrogenated Castor Oil

Glycerin

Polyquaternium-10

Phenoxyethanol

Benzyl Alcohol

Alpha-Glucan Oligosaccharide

Citronellyl Methylcrotonate

Panthenol

Ethylhexylglycerin

Dehydroacetic Acid

Mannitol

Trisodium Ethylenediamine Disuccinate

Tetraselmis Suecica Extract

Lactic Acid

Potassium Benzoate

Water, Glycolic Acid, Propanediol, Hydrogenated Castor Oil, PEG-40 Hydrogenated Castor Oil, Betaine, Glycerin, Sodium Hydroxide, Polyquaternium-10, Phenoxyethanol, Benzyl Alcohol, Alpha-Glucan Oligosaccharide, Citronellyl Methylcrotonate, Panthenol, Ethylhexylglycerin, Dehydroacetic Acid, Mannitol, Trisodium Ethylenediamine Disuccinate, Sodium Benzoate, Tetraselmis Suecica Extract, Lactic Acid, Potassium Benzoate

Reviews

Alternatives

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Betaine is a humectant. Like hyaluronic acid, it helps attract and retain moisture in the skin. It’s known for being gentle and for helping the skin maintain balanced hydration.

Betaine is mainly used to improve hydration and support calmer skin. It helps skin cells regulate water balance because it functions as an osmolyte.

Some studies suggest betaine may support making skin tone more even.

Fun fact: Betaine naturally exists in the skin and the body. In cosmetic products, it can be either plant-derived (most commonly from sugar beets) or synthetically produced for consistency and stability.

Betaine is also known as trimethylglycine.

Glycolic Acid is arguably the most famous alpha hydroxy acid (AHA) with tons of research backing its benefits.

It is found naturally in sugar cane but the form used in skincare is usually synthetic for purity and stability.

Glycolic acid removes the top layer of dead skin cells to allow newer and fresher ones to emerge.

AHAs work by breaking down the structural “glue” that holds old skin cells in place. When that buildup is gone, your skin can renew itself more efficiently.

Research also shows glycolic acid stimulates collagen production, helping to firm and thicken the skin over time. This is one of its biggest advantages over other AHAs.

Overall, glycolic acid helps with:

Fun fact: Glycolic acid boosts skin hydration by helping it produce molecules that increase hyaluronic acid naturally.

To work best, glycolic acid products should have a pH between 3-4 (that’s where exfoliation is most effective but still gentle on skin).

The pH and concentration of a product are key to its effectiveness:

It is normal to feel a slight stinging sensation when using glycolic acid. This usually fades as your skin adjusts.

Because glycolic acid has the smallest molecular size in the AHA family, it can penetrate deeper, which enhances its effectiveness but also makes it more likely to irritate sensitive skin.

If your skin is very sensitive or prone to rosacea, glycolic acid may be too strong; in that case, try milder options like lactic acid or a PHA instead.

Recent studies suggest glycolic acid might even help protect against UV damage. But don’t skip sunscreen! Freshly exfoliated skin is more sensitive to the sun.

Glycolic acid is a skincare superstar. It smooths, brightens, hydrates, and firms the skin. Unless you’re highly sensitive, it’s well worth adding to your routine.

Read more about some other popular AHA's here:

PEG-40 Hydrogenated Castor Oil is an emulsifier derived from castor oil.

As an emulsifying agent, it helps other ingredients like fragrances and fat-soluble vitamins dissolve cohesively.

Due to its large molecule size, it doesn't penetrate beyond the skin's surface.

This ingredient has a solid regulatory track record; the CIR Expert Panel first concluded it was safe for use in cosmetics at concentrations up to 100% in 1997. A 2012 reassessment reaffirmed that finding. Safety studies have also found no irritation or evidence of toxicity.

A 2019 study did find this ingredient to grow Malassezia, so this ingredient may not be fungal acne safe.

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.

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.

Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.

Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.

It is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.

Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.

We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.

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.

In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.

Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.

"Alkaline" refers to a high pH level. A low pH level would be considered acidic.

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. Remember to stay hydrated!

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