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Kosas · Serums

Plump + Juicy Vegan Collagen Spray-On Serum

$48·100 ml·Leave-on
93
Low concern

Why this score

Concern53 / 55
  • No ingredients carry meaningful, evidence-backed concern.

How much genuine, cited concern the ingredients carry, weighted by how much of each is likely present and whether the product stays on or rinses off.

Transparency20 / 20
  • No hidden fragrance blend.

Whether the full ingredient list, and any fragrance, are actually disclosed.

Formulation restraint20 / 25
  • 2 known irritant or fragrance-allergen ingredients: Hydrolyzed Wheat Protein, Benzyl Alcohol.

Needless irritant or allergen load for the product type. A clean, purposeful formula scores well without any "free-from" theater.

Scored by PlainBody Editorial against the PlainScore method · Label checked July 2026

What’s inside

WaterGenerally safe

The base most products are built on. It carries the other ingredients and has no safety concern.

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PropanediolGenerally safe

A corn-derived solvent and humectant that has largely replaced propylene glycol in "clean" formulas; CIR reviewed the alkane diol group and found use concentrations up to about 40 percent in leave-on products like deodorant sticks with no meaningful irritation signal.

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Pentylene GlycolGenerally safe

Pentylene glycol is a humectant and solvent that also offers mild antimicrobial support in formulas. It is generally well tolerated, with only rare reports of irritation, mostly in already sensitive or compromised skin.

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GlycerinGenerally safe

A humectant that draws water into the skin. One of the best-studied, best-tolerated ingredients in personal care.

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Hydrolyzed Rice ProteinGenerally safe

A protein fragment from rice that helps bind water and strengthen hair. It is mild and well tolerated, making it a suitable option for those seeking a plant-derived protein conditioner without the allergen concerns of wheat or other grain proteins.

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Sodium GluconateGenerally safe

A gentle humectant derived from glucose. It draws water to the skin and is mild enough for sensitive skin types. Widely used in cosmetics without reported safety concerns.

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ErythritolGenerally safe

A sugar alcohol humectant that draws water into the skin to support hydration. Erythritol is also used in food products and has a strong history of safety in both food and cosmetic use, with no meaningful irritation signals.

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Hydrolyzed Wheat ProteinWatch if sensitive

A protein fragment that draws water into the hair shaft and is used to strengthen and add body. People with wheat sensitivity or protein allergies should patch-test first, as protein hydrolysates can trigger reactions in those with known sensitivities.

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Caprylic/Capric TriglycerideGenerally safe

A lightweight, odorless emollient made by combining coconut or palm-derived fatty acids with glycerin. It spreads easily, feels non-greasy, and has a long history of use in skin and hair products with no meaningful irritation or sensitization signal.

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MaltodextrinGenerally safe

A starch derivative used in cosmetics to thicken formulations and improve texture. It has been used safely in food and cosmetics for decades and shows low irritation potential across rinse-off and leave-on products.

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Lactobacillus FermentGenerally safe

A metabolite produced through fermentation of milk by Lactobacillus bacteria, valued in skincare for humectant and antioxidant properties. It is documented in cosmetic formulations as well tolerated, though people sensitive to fermentation byproducts or lactic acid may want to patch test.

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GlycineGenerally safe

The simplest amino acid, naturally present in skin and collagen, commonly used as a humectant to help retain moisture. It has a long history of safe use in cosmetics with no known hazards at typical concentrations.

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ProlineGenerally safe

An amino acid abundant in collagen that functions as a humectant to draw moisture into the skin. It is well tolerated in skincare products and assessed as safe for cosmetic use at standard formulation levels.

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Hydrolyzed Sodium HyaluronateGenerally safe

A lower molecular weight version of hyaluronic acid designed for better skin penetration. It has been extensively studied and shown to support skin hydration and barrier function with excellent tolerability in diverse formulations and skin types.

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Hyaluronic AcidGenerally safe

A humectant that holds water at the skin surface for a more hydrated look. No safety concern.

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Palmitoyl Tripeptide-38Generally safe

A lipopeptide that targets fibroblast activity to support skin elasticity and firmness. Cosmetic assessments confirm no safety concerns at recommended use levels, and it is well tolerated across skin types.

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Potassium SorbateGenerally safe

A widely used, gentle preservative also common in food. It is generally well tolerated, though it can occasionally cause mild, transient irritation in people with already-compromised or very reactive skin.

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Citric AcidGenerally safe

Used in tiny amounts to set a product to skin-friendly pH. No concern at those levels.

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Benzyl AlcoholWatch if sensitive

A common preservative and fragrance/solvent ingredient found naturally in many essential oils. It is well tolerated by most people at the levels used in cosmetics, but it is one of the 26 EU-designated fragrance allergens and can trigger reactions in people with an existing sensitivity.

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Sodium BenzoateGenerally safe

The sodium salt of benzoic acid, used as a preservative in both foods and cosmetics. Decades of safety review support its use at typical cosmetic concentrations, with mild irritation the main reported issue in sensitive skin.

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Lower-concern alternatives

Same category, higher PlainScore.

Cosmetic information for general education, not medical advice. Concern ratings are evidence-graded and cited on each ingredient page. See how we score.