Kosas Plump + Juicy Vegan Collagen Spray-On Serum Versus BYOMA Balancing Face Mist

Kosas Plump + Juicy Vegan Collagen Spray-On Serum Versus BYOMA Balancing Face Mist

This barrier-repair serum is formulated around Lactobacillus Ferment to strengthen the skin barrier.

This barrier-repair toner is formulated around Ceramide NP and Cholesterol to strengthen the skin barrier and calm redness.

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Propanediol

Pentylene Glycol

Glycerin

Phenethyl Alcohol

Hydrolyzed Rice Protein

Hydrolyzed Vegetable Protein

Polyglyceryl-6 Caprylate

Polyglyceryl-3 Cocoate

Polyglyceryl-4 Caprate

Polyglyceryl-6 Ricinoleate

Sodium Gluconate

Erythritol

Hydrolyzed Pea Protein

Caprylic/Capric Triglyceride

Maltodextrin

Acacia Seyal Gum Extract

Lactobacillus Ferment

Artemisia Capillaris Flower Extract

Hibiscus Sabdariffa Fruit Extract

Hibiscus Sabdariffa Flower Extract

Glycine

Proline

Hydrolyzed Sodium Hyaluronate

Sodium Hyaluronate

Palmitoyl Tripeptide-37

Potassium Sorbate

Citric Acid

Benzyl Alcohol

Sodium Benzoate

Water, Propanediol, Pentylene Glycol, Glycerin, Phenethyl Alcohol, Hydrolyzed Rice Protein, Hydrolyzed Vegetable Protein, Polyglyceryl-6 Caprylate, Polyglyceryl-3 Cocoate, Polyglyceryl-4 Caprate, Polyglyceryl-6 Ricinoleate, Sodium Gluconate, Erythritol, Hydrolyzed Pea Protein, Caprylic/Capric Triglyceride, Maltodextrin, Acacia Seyal Gum Extract, Lactobacillus Ferment, Artemisia Capillaris Flower Extract, Hibiscus Sabdariffa Fruit Extract, Hibiscus Sabdariffa Flower Extract, Glycine, Proline, Hydrolyzed Sodium Hyaluronate, Sodium Hyaluronate, Palmitoyl Tripeptide-37, Potassium Sorbate, Citric Acid, Benzyl Alcohol, Sodium Benzoate

Butylene Glycol

Sorbitol

Ceramide NP

Cholesterol

Phytosphingosine

Bifida Ferment Filtrate

Stearic Acid

Caprylyl Glycol

Oleic Acid

Hydrogenated Lecithin

Allantoin

Panthenol

Lactic Acid

Betaine

Hydroxyethylcellulose

Hydroxyacetophenone

1,2-Hexanediol

Caprylhydroxamic Acid

Water, Butylene Glycol, Glycerin, Propanediol, Sorbitol, Ceramide NP, Cholesterol, Phytosphingosine, Lactobacillus Ferment, Bifida Ferment Filtrate, Stearic Acid, Caprylyl Glycol, Oleic Acid, Caprylic/Capric Triglyceride, Hydrogenated Lecithin, Allantoin, Panthenol, Lactic Acid, Betaine, Hydroxyethylcellulose, Hydroxyacetophenone, 1,2-Hexanediol, Caprylhydroxamic Acid

Reviews

Be the first to review

Alternatives

Ingredients Explained

These ingredients are found in both products.

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

Caprylic/Capric Triglyceride (aka MCT Oil) is a lightweight emollient, solvent, and texture enhancer. It is considered a skin-softener by helping to prevent moisture loss.

Though it behaves like an oil, it is not technically one due to its chemical composition. One perk of this ingredient is that it is very stable, resistant to oxidation, and unlikely to go rancid.

In practice, that translates to a long shelf life and a consistently elegant skin feel.

While there is an assumption Caprylic Triglyceride can clog pores due to it being derived from coconut oil, there is no research supporting this. Just patch test if you have concerns.

Fractionated coconut oil and MCT Oil are both listed as Caprylic/Capric Triglyceride according to INCI. This is because INCI names are based on the ingredient’s final chemical composition and not its marketing name or source.

This ingredient is treated as the gold standard fungal acne safe oil. Even though it is coconut derived, the problematic lauric acid is stripped out.

This leaves just caprylic (C8) and capric (C10) acid. These chain lengths actually trend antifungal; a 2020 study found caprylic acid was enough to disrupt Malassezia furfur cell membrane, with a caprylic acid derivative damaging membrane structures at concentrations as low as 0.2%.

Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.

Topically, glycerin does several things at once:

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

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

This ingredient is made when the Lactobacillus bacteria (the same kind that makes yogurt and kimchi) are allowed to ferment a nutrient medium.

As it ferments, it collects lactic acid, peptides, enzymes, and other bioactive metabolites to provide:

A 2023 review noted that probiotic fermentation ingredients like this one can enhance antioxidant capacity, reduce UV-induced oxidative damage, and support barrier function.

One clinical study from the same year showed a Lactobacillus ferment lysate significantly reduced transepidermal water loss and improved skin hydration.

Another review highlighted that topical Lactobacillus-based preparations can improve ceramide levels in the stratum corneum, support barrier integrity, and even help reduce S. aureus colonization in atopic dermatitis.

Why is this so cool?

Basically, your skin's outer layer works as a brick wall; skin cells are bricks and ceramides are the mortar holding it together. Moisture escapes, irritants get in, and your skin gets dry and reactive when ceramide levels drop. On top of that, "bad" skin bacteria S. aureus loves to move in when your barrier is weak to make inflammation and irritation worse.

So Lactobacillus ferment is basically patching the wall and evicting the troublemaker when it boosts ceramide production and help keep S. aureus in check.

On top of all this, it also acts as a mild antimicrobial preservative booster.

Just so you know, most studies focus on specific strains or the lysate form rather than this generic "Lactobacillus Ferment", so results can vary.

Though it's a promising ingredient, it doesn't have decades of robust clinical data behind it just yet.

Lactobacillus Ferment is generally considered safe for fungal-acne prone skin. The key thing to understand is that it comes from bacteria, not yeast or fungus.

Yeast-derived ferments (like galactomyces) have been shown to activate a protein that's linked to Malassezia-related skin issues whereas lactobacillus doesn't have that problem.

Its byproducts also don't contain the types of fatty acids (C11-24 chain lengths) that Malassezia feeds on.

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.

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