Peptide Skincare & BeautySkin science and ingredient guides

Skin science article

Paula's Choice 10% Azelaic Acid Booster Versus La Roche-Posay Effaclar Ultra Concentrated Serum

Paula's Choice 10% Azelaic Acid Booster Versus La Roche-Posay Effaclar Ultra Concentrated Serum This calming treatment is formulated around Azelaic Acid and Salicylic Acid to calm redness and fade the look of dark spots. This acne serum is formulated around Gl

Paula's Choice 10% Azelaic Acid Booster Versus La Roche-Posay Effaclar Ultra Concentrated Serum

This calming treatment is formulated around Azelaic Acid and Salicylic Acid to calm redness and fade the look of dark spots.

This acne serum is formulated around Glycolic Acid and Niacinamide to clear breakouts and refine skin texture.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Azelaic Acid

C12-15 Alkyl Benzoate

Caprylic/Capric Triglyceride

Methyl Glucose Sesquistearate

Glycerin

Cetearyl Alcohol

Glyceryl Stearate

Dimethicone

Salicylic Acid

Adenosine

Glycyrrhiza Glabra Root Extract

Boerhavia Diffusa Root Extract

Allantoin

Bisabolol

Cyclopentasiloxane

Xanthan Gum

Sclerotium Gum

Propanediol

Butylene Glycol

Phenoxyethanol

Water, Azelaic Acid, C12-15 Alkyl Benzoate, Caprylic/Capric Triglyceride, Methyl Glucose Sesquistearate, Glycerin, Cetearyl Alcohol, Glyceryl Stearate, Dimethicone, Salicylic Acid, Adenosine, Glycyrrhiza Glabra Root Extract, Boerhavia Diffusa Root Extract, Allantoin, Bisabolol, Cyclopentasiloxane, Xanthan Gum, Sclerotium Gum, Propanediol, Butylene Glycol, Phenoxyethanol

Alcohol Denat.

Glycolic Acid

Niacinamide

Dimethyl Isosorbide

Pentylene Glycol

Sodium Hydroxide

PEG-60 Hydrogenated Castor Oil

Hydroxyethylpiperazine Ethane Sulfonic Acid

Citric Acid

PEG-30 Glyceryl Cocoate

Capryloyl Salicylic Acid

Biosaccharide Gum-1

Maltodextrin

Phytic Acid

Polyquaternium-10

Parfum

Water, Alcohol Denat., Propanediol, Glycolic Acid, Niacinamide, Dimethyl Isosorbide, Pentylene Glycol, Salicylic Acid, Sodium Hydroxide, PEG-60 Hydrogenated Castor Oil, Hydroxyethylpiperazine Ethane Sulfonic Acid, Citric Acid, PEG-30 Glyceryl Cocoate, Capryloyl Salicylic Acid, Biosaccharide Gum-1, Maltodextrin, Phytic Acid, Polyquaternium-10, Parfum

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.

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.

Salicylic Acid (also known as beta hydroxy acid or BHA) is a well-known ingredient for treating skin that struggles with acne and clogged pores. It exfoliates both the skin's surface and deep within the pores to help clear out buildup, control oil, and reduce inflammation.

Unlike AHAs (alpha hydroxy acids), salicylic acid is oil-soluble. This allows it to penetrate into pores which makes it especially effective for treating blackheads and preventing future breakouts.

Salicylic acid is also known for its soothing properties. It has a similar structure to aspirin and can calm inflamed or irritated skin, making it a good option for acne-prone skin that is also sensitive.

Concentrations of 0.5-2% are recognized by the U.S. FDA as an over-the-counter topical acne product.

It can cause irritation and/or dryness if one's skin already has a compromised moisture barrier, so it's best to focus on repairing that before introducing this ingredient into your routine.

While salicylic acid does not increase sun sensitivity, it’s still important to wear sunscreen daily to protect your skin.

If you are looking for the ingredient called BHA or Butylated Hydroxyanisole, click here.

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!

Similar Comparisons

The reference edit

Ingredients, questions
& further reading.

Connected source records selected through this article’s public topic index.

01

Formula cabinet

Ingredients & structured notes

Ingredient index

Ingredients Explained

  1. 01These ingredients are found in both products.
  2. 02Ingredients higher up in an ingredient list are typically present in a larger amount.
  3. 03Polysorbate 20 is a gentle, water-soluble emulsifier and mild surfactant. It stops oil and water from separating to keep your formulas blended and stable.
  4. 04It also acts as a mild penetration enhancer by helping active ingredients absorb slightly better.
  5. 05The common safety discussion around this ingredient involves a manufacturing byproduct called 1,4-dioxane.
  6. 06Trace amounts can form during production but the EU's Scientific Committee on Consumer Safety has concluded that levels at/below 10 ppm in finished products are safe (commercial products consistently fall within acceptable margins).
  7. 07True allergic reactions are uncommon and the CIR Expert Panel has confirmed this ingredient to be safe as used in cosmetics.
  8. 08Because it is derived from lauric acid, it may not be fungal acne safe.
  9. 09Salicylic Acid (also known as beta hydroxy acid or BHA) is a well-known ingredient for treating skin that struggles with acne and clogged pores. It exfoliates both the skin's surface and deep within the pores to help clear out buildup, control oil, …
  10. 10Unlike AHAs (alpha hydroxy acids), salicylic acid is oil-soluble. This allows it to penetrate into pores which makes it especially effective for treating blackheads and preventing future breakouts.
  11. 11Salicylic acid is also known for its soothing properties. It has a similar structure to aspirin and can calm inflamed or irritated skin, making it a good option for acne-prone skin that is also sensitive.
  12. 12Concentrations of 0.5-2% are recognized by the U.S. FDA as an over-the-counter topical acne product.
  13. 13It can cause irritation and/or dryness if one's skin already has a compromised moisture barrier, so it's best to focus on repairing that before introducing this ingredient into your routine.
  14. 14While salicylic acid does not increase sun sensitivity, it’s still important to wear sunscreen daily to protect your skin.
  15. 15If you are looking for the ingredient called BHA or Butylated Hydroxyanisole, click here.
  16. 16Tetrasodium EDTA is the salt formed from neutralizing ethylenediamine tetraacetic acid with sodium hydroxide. It is a chelating agent and used to prevent metal ions from binding to other ingredients. This helps keep the product and ingredients stable.
  17. 17Tetrasodium EDTA comes as a white solid and is soluble in water.
  18. 18Water. 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.
  19. 19So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
  20. 20You'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!
Source · skinsort.com
02

Product index

Related product references

03

Comparison edit

Read side by side