Doa Kozmetik Lactic Acid Serum Versus Biossance Squalane + 10% Lactic Acid Resurfacing Night Serum

Doa Kozmetik Lactic Acid Serum Versus Biossance Squalane + 10% Lactic Acid Resurfacing Night Serum

This smoothing exfoliator is formulated around Lactic Acid to refine skin texture and brighten dull-looking skin.

This smoothing serum is formulated around Lactic Acid and Squalane to refine skin texture and brighten dull-looking skin.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Lactic Acid

Trehalose

Sodium Lactate

Sodium PCA

Dimethyl Sulfone

Saccharide Isomerate

Saccharomyces/Zinc Ferment

Mangostin

Magnolol

Honokiol

Polyglyceryl-10 Oleate

Helianthus Annuus Seed Oil

Sunflower Seed Oil Polyglyceryl-6 Esters

Prunus Armeniaca Kernel Oil

Sorbitan Palmitate

Dicetyl Phosphate

Phenoxyethanol

Caprylyl Glycol

Water, Lactic Acid, Trehalose, Sodium Lactate, Sodium PCA, Dimethyl Sulfone, Saccharide Isomerate, Saccharomyces/Zinc Ferment, Mangostin, Magnolol, Honokiol, Polyglyceryl-10 Oleate, Helianthus Annuus Seed Oil, Sunflower Seed Oil Polyglyceryl-6 Esters, Prunus Armeniaca Kernel Oil, Sorbitan Palmitate, Dicetyl Phosphate, Phenoxyethanol, Caprylyl Glycol

Caprylic/Capric Triglyceride

Squalane

Glycerin

Sodium Hydroxide

Cetearyl Olivate

Propanediol

Sorbitan Olivate

Cetearyl Alcohol

Lespedeza Capitata Leaf/Stem Extract

Polyacrylate Crosspolymer-6

Acacia Senegal Gum

Sodium Gluconate

Xanthan Gum

Ethylhexylglycerin

Lavandula Angustifolia Oil

Linalool

Water, Caprylic/Capric Triglyceride, Lactic Acid, Squalane, Glycerin, Sodium Hydroxide, Cetearyl Olivate, Propanediol, Sorbitan Olivate, Cetearyl Alcohol, Lespedeza Capitata Leaf/Stem Extract, Polyacrylate Crosspolymer-6, Acacia Senegal Gum, Sodium Gluconate, Xanthan Gum, Phenoxyethanol, Ethylhexylglycerin, Lavandula Angustifolia Oil, Linalool

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Alternatives

Ingredients Explained

These ingredients are found in both products.

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

Lactic Acid is another well-loved alpha hydroxy acid (AHA). It is gentler than glycolic acid but still highly effective.

Its main role is to exfoliate the surface of the skin by loosening the “glue” that holds dead skin cells together. Shedding those old cells leads to smoother, softer, and more even-toned skin.

Because lactic acid molecules are larger than glycolic acid, they don’t penetrate as deeply. This means they’re less likely to sting or irritate, making it a great choice for beginners or those with sensitive skin.

Like glycolic acid, it can:

Lactic acid also acts as a humectant (like hyaluronic acid). It can draw water into the skin to improve hydration and also plays a role in the skin's natural moisturizing factor (NMF) in the form of sodium lactate.

Studies show it can boost ceramide production to strengthen the skin barrier and even help balance the skin’s microbiome.

To get results, choose products with a pH between 3-4.

Lower strengths (5-12%) focus on surface exfoliation; higher strengths (12% and up) can reach deeper in the dermis (deeper, supportive layer) to improve skin texture and firmness over time.

Though it was originally derived from milk, most modern lactic acid used in skincare is vegan. It is made through non-dairy fermentation to create a bio-identical and stable form suitable for all formulations.

When lactic acid shows up near the end of an ingredient list, it usually means the brand added just a tiny amount to adjust the product’s pH.

Legend has it that Cleopatra used to bathe in sour milk to help reduce wrinkles.

Lactic acid is truly a gentle multitasker: it exfoliates, hydrates, strengthens, and brightens. It's a great ingredient for giving your skin a smooth, glowing, and healthy look without the harshness of stronger acids.

Read more about some other popular AHA's here:

Phenoxyethanol is one of the most widely used preservatives in skincare (and for good reason!).

It has a large spectrum of antimicrobial activity and especially effective bacteria, yeast, and mold while only having a weak effect on your skin's natural microbiome.

On a cellular level, it disrupts the cell membranes of microbes by poking holes that make the cell leak. This shuts down the chemical reactions the microbe needs to make energy so it can no longer survive.

Another perk of this ingredient is that it stays functional across a wide pH range (3-10).

You'll often see it paired with boosters like Ethylhexylglycerin; one study showed that a 1:9 ratio of Ethylhexylglycerin to Phenoxyethanol damages bacterial membranes as effectively as doubling the Phenoxyethanol concentration on its own.

Typical use concentrations range from 0.3-1% depending on the formula, and this ingredient is capped at 1% int the EU.

Safety-wise, the fear mongering does not hold up to the evidence. The EU's Scientific Committee on Consumer Safety and FDA consider it safe as a preservative at up to 1%, including for children of all ages.

Adverse systemic effects only showed up in animal studies at exposures roughly 200x higher than what people get from cosmetics. And despite its very widespread use, this ingredient is a rare sensitizer and allergic reactions are uncommon.

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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