Beauty ingredient research

Beauty ingredients explained in plain English

Browse the review database to understand what an ingredient is, what it does in a beauty formula, when it is useful, and when it deserves caution across skincare, haircare, bodycare, makeup, and more.

20769

Reviewed ingredients

524

Low-concern standouts

2884

Need usage caution

Showing 60 of 1,094
AllUV absorberUV filterabrasiveabsorbentacne treatmentactiveactive ingredientadhesivealkalizing agentamino acidanti-aginganti-androgenanti-cavityanti-cavity agentanti-inflammatoryanti-irritantanticariesanticavity agentantidandruffantifungalantimicrobialantioxidantantiperspirantantiplaqueastringentbarrier repairbarrier supportbarrier-repairbarrier-supportbinderbinding agentbiotechbiotechnologybond-builderbotanicalbotanical extractbotanical oilbotanical waterbrighteningbrightening agentbufferbuffering agentcell-communicating ingredientceramidechelating agentchemicalchemical intermediateclaycleansercleansingcleansing agentcolorantconditionerconditioningconditioning agentcooling agentcosmeticcosmetic additivecosmetic colorantcosmetic ingredientcosmetic pigmentcosmetic powdercosmetic-texturizercosmetic-waxcosmeticscrosslinking agentdelivery agentdelivery systemdenaturantdeodorantdeodorant agentdepigmenting agentdepilatorydepilatory agentdesensitizing agentdyedye intermediatedye precursordye-intermediateemollientemulsifierenzymeessential oilexfoliantexperimentaleyelashfermentfilm formerfilm-formerfilm-formingfilm-forming agentfirming agentfixativeflavoring agentformulationfragrancefragrance ingredientfunctional ingredientgashair carehair colorhair coloranthair conditionerhair dyehair removalhair-carehair-colorhaircarehumectantindustrialinsecticideintermediatelashlash carelash enhancerlash-and-browlip carelipidmakeupmarine extractmasking agentmicrobiomemicrobiome modulatormineralmoisturizernail carenail-careocclusiveoilopacifieropacifying agentoptical agentoral careotheroxidative dyeoxidative dye precursoroxidizing agentpH adjusterpain reliefpenetration enhancerpeptidepersonal careph adjusterpharmaceuticalpheromonepigmentplant oilplasticizerpolymerpolymer precursorprebioticprescription-drugpreservativepreservative boosterprobioticprocessing agentprocessing aidpropellantproteinpurifyingreducing agentretinoidscalp caresebum regulatorsebum-regulatorself-tannerself-tanningsensory additivesensory agentsensory modifiersiliconeskin barrierskin barrier supportskin conditionerskin conditioningskin conditioning agentskin lighteningskin protectantskin-conditioningskin-conditioning agentskin-identicalskin-identical ingredientskin-lighteningskin-lightening agentskincaresolventsoothingsoothing agentstabilizerstimulantsunscreensurfactantsyntheticsynthetic colorantsynthetic dyesynthetic resinsynthetic-coloranttexture enhancertexturizerthickenertoneruv-absorberuv-filtervasoactivevasodilatorviscosity controlviscosity controllingviscosity controlling agentvitaminwax

Humectant

Methylsilanol PCA

METHYLSILANOL PCA

4.0

Methylsilanol PCA is a gentle, silicon-based humectant that helps hydrate and smooth the skin, often used in anti-aging products.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Microalgae Extract

Cylindrotheca Fusiformis Extract

3.8

A gentle microalgae extract that helps hydrate and condition skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Microalgae Extract Blend

THALASSIOSIRA AESTIVALIS/GRAVIDA/NITZSCHIOIDES/NORDENSKIOELDII/ROTULA EXTRACT

4.0

A blend of marine microalgae that helps hydrate and protect the skin with antioxidant benefits, though research on this specific mix is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Milk Ferment

Lactobacillus Ferment

4.0

Milk ferment is a probiotic ingredient that gently hydrates and supports a healthy skin barrier, making it a good choice for sensitive or dry skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Milk Protein

LAC PROTEIN

3.8

Milk protein is a gentle, natural humectant that helps hydrate and soften skin, but it offers only temporary surface benefits and may not suit those with dairy allergies.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Milk Serum Protein

Lactis Serum Proteinum

3.8

A gentle, protein-rich ingredient that helps hydrate and temporarily smooth the skin's surface, but may not be suitable for those with dairy allergies.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Humectant

Milt Extract

Milt Extract

3.8

Milt extract is a novel, protein-packed ingredient that may help hydrate and plump skin, but research is limited and it may not suit everyone due to its animal origin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Molasses Extract

MOLASSES EXTRACT

3.8

Molasses extract is a gentle humectant that helps hydrate and soothe the skin, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Momordica Fruit Juice

Momordica Grosvenorii Fruit Juice

3.8

A gentle, water-based fruit juice that adds light hydration and antioxidant protection, but research on its skincare benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Moth Cocoon Extract

Moth Cocoon Extract

3.5

A gentle, protein-rich extract that helps hydrate and temporarily smooth the skin's surface, but research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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Humectant

Mucor Miehei Extract

MUCOR MIEHEI EXTRACT

3.8

A gentle fungal extract that helps hydrate and condition skin, but research is still early.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Multi-Ferment Gold & HA Complex

Bacillus/Lactobacillus/Saccharomyces/Colloidal Gold/Hyaluronic Acid/Rice Bran Ferment Filtrate

4.0

A fermented blend that may support skin hydration and barrier function, but research on its unique gold and multi-strain combination is still emerging.

Irritation

low

Source

biotech

beautyskincarehumectantantioxidant
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Skin conditioning agent

Multi-Ferment Probiotic Complex

SACCHAROMYCES/RHODOBACTER/LACTOBACILLUS/LEUCONOSTOC/STREPTOMYCES GRISEUS/ASPERGILLUS/BACILLUS FERMENT FILTRATE

4.0

A multi-strain fermented ingredient that may help balance skin microbiome and improve hydration, but research is mostly on individual strains rather than this exact blend.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Multi-Ferment Rice Protein Complex

KLUYVEROMYCES/LACTOBACILLUS/LACTOCOCCUS/LEUCONOSTOC/SACCHAROMYCES/HYDROLYZED RICE PROTEIN FERMENT FILTRATE

4.0

A gentle, fermented multi-strain ingredient that hydrates and supports the skin barrier without irritation.

Irritation

low

Source

biotech

beautyskincarehumectantsoothing
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Humectant

Multi-Ferment Wheat Protein Complex

KLUYVEROMYCES/LACTOBACILLUS/LACTOCOCCUS/LEUCONOSTOC/SACCHAROMYCES/HYDROLYZED WHEAT GLUTEN FERMENT FILTRATE

4.0

A fermented probiotic-wheat complex that helps hydrate and calm the skin, but those with gluten sensitivity should be cautious.

Irritation

low

Source

biotech

beautyskincarehumectantsoothing
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Humectant

Multi-Grain Amino Acid Complex

CORN KERNEL/WHEAT KERNEL/SOYBEAN/PEA SEED AMINO ACIDS

4.0

A gentle, plant-derived amino acid blend that helps hydrate and support the skin barrier without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Multi-Peptide Hyaluronate Complex

Ethyl Carbazido Hyaluronate, SH-Oligopeptide-1, SH-Polypeptide-94, Dipeptide-35, SH-Polypeptide-95

3.8

A multi-ingredient blend that combines modified hyaluronic acid with peptides for potential hydration and skin-smoothing benefits, though research on this exact mix is limited.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantanti-aging
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Humectant

Multi-Strain Ferment Complex

ACETOBACTER/BACILLUS/LACTOBACILLUS/SACCHAROMYCES/STREPTOCOCCUS/FRUIT/LEAF/IMPERATA CYLINDRICA ROOT/SEED/BROCCOLI/ERIOCEPHALUS PUNCTULATUS/MISTLETOE/ACRYLATES C10-30 ALKYL ACRYLATES CROSSPOLYMER/ALPHA-GLUCAN/BETAINE/BUTYLENE GLYCOL/EPIGALLOCATECHIN GALLATYL GLUCOSIDE/GLYCERETH-26/GLYCERIN/GLUCOSYL CERAMIDE/GLUCOSYL HESPERIDIN/HYDROLYZED HYALURONIC ACID/MALTODEXTRIN/PANTHENOL/SCLEROTIUM GUM/TROMETHAMINE/XANTHAN GUM FERMENT FILTRATE

4.0

A complex ferment blend that hydrates, soothes, and supports skin barrier health with multiple probiotic and botanical actives.

Irritation

low

Source

mixed

beautyskincarehumectantantioxidant
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Humectant

Multi-Strain Lactobacillus Ferment

KLUYVEROMYCES/LACTOBACILLUS/LACTOCOCCUS/LEUCONOSTOC/SACCHAROMYCES LAC FERMENT FILTRATE

4.0

A gentle, fermented ingredient that helps hydrate and support the skin's natural barrier without irritation.

Irritation

low

Source

biotech

beautyskincarehumectant
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Exfoliant

Multi-Strain Milk Ferment Filtrate

LACTOBACILLUS/LEUCONOSTOC/ACETOBACTER/KLUYVEROMYCES/SACCHAROMYCES MILK FERMENT FILTRATE

4.0

A gentle, multi-strain milk ferment that exfoliates and hydrates without harshness, ideal for sensitive skin looking for a mild glow.

Irritation

low

Source

biotech

beautyskincareexfolianthumectant
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Humectant

Mung Bean Seed Water

Phaseolus Radiatus Seed Water

3.8

Mung Bean Seed Water is a gentle, antioxidant-rich base ingredient that hydrates and soothes, but its benefits are not as well-studied as more common humectants like glycerin.

Irritation

low

Source

natural

beautyskincarehumectant
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Film Former

Myristoyl PCA Chitin

MYRISTOYL/PCA CHITIN

4.0

A gentle film-forming ingredient that locks in moisture and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

semi-synthetic

beautyskincarefilm-formerhumectant
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Film Former

Myristoyl Pullulan

MYRISTOYL PULLULAN

4.0

A gentle, hydrating film-former that leaves skin feeling smooth and plumped without stickiness — ideal for sensitive or dry skin types.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantfilm-former
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Humectant

Nahocol D

NAHOCOL D

3.8

Nahocol D is a gentle, algae-derived humectant that helps hydrate and condition skin, though research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Neochloris Oleoabundans Extract

Neochloris Oleoabundans Extract

4.0

A gentle, algae-derived ingredient that helps hydrate and protect skin, but research on its specific benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

New Zealand Flax Leaf Water

Phormium Tenax Leaf Water

3.8

A gentle, hydrating botanical water with antioxidant properties, best for soothing and refreshing normal to dry skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Niacinamide

Niacinamide

4.5

A well-researched, multi-tasking vitamin that strengthens skin, fades dark spots, and calms redness without irritation.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Humectant

Niacinamide Lactate

Niacinamide Lactate

4.3

A gentle dual-action ingredient that combines niacinamide's barrier support with lactic acid's mild exfoliation for smoother, brighter skin.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantexfoliant
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Exfoliant

Niacinamide Mandelate

Niacinamide Mandelate

4.3

A gentle, dual-action ingredient that exfoliates and supports the skin barrier without the irritation of standalone acids.

Irritation

low

Source

semi-synthetic

beautyskincareexfolianthumectant
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Skin conditioning agent

Niacinamide Yeast Ferment

NIACINAMIDE/YEAST POLYPEPTIDE

4.0

A gentle, multi-tasking ingredient that combines niacinamide's brightening and barrier-supporting benefits with yeast peptides for added hydration and skin-smoothing effects.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantantioxidant
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Humectant

Nigero Oligosaccharides

Nigero Oligosaccharides

4.0

A gentle, microbiome-friendly sugar that hydrates and helps balance skin bacteria without irritation.

Irritation

low

Source

biotech

beautyskincarehumectantprebiotic
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Humectant

Nostoc Flagelliforme Extract

NOSTOC FLAGELLIFORME EXTRACT

3.8

A hydrating, soothing extract from a unique cyanobacterium, but research on its cosmetic benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Nostochopsis Lobatus Extract

Nostochopsis Lobatus Extract

3.8

A gentle algae extract that helps hydrate skin and defend against environmental stress, though research is still early.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Oat Kernel Protein

AVENA SATIVA KERNEL PROTEIN

4.3

Oat kernel protein is a gentle, hydrating ingredient that supports the skin barrier and soothes dryness without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Okra Fruit Extract

Hibiscus Esculentus Fruit Extract

4.0

Okra Fruit Extract is a gentle, hydrating ingredient that forms a light film on skin to help lock in moisture and calm irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Okra Seed Extract

Hibiscus Esculentus Seed Extract

3.8

Okra Seed Extract is a gentle, hydrating ingredient that helps attract moisture to the skin, but research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Olive Oil Ferment Filtrate

SACCHAROMYCES/OLEA EUROPAEA FRUIT OIL/GLYCERIN FERMENT FILTRATE

4.0

A gentle fermented ingredient that helps hydrate and support the skin barrier without irritation.

Irritation

low

Source

biotech

beautyskincarehumectant
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Humectant

Olive Sap Extract

Olea Europaea Sap Extract

3.8

Olive sap extract is a gentle, hydrating ingredient with antioxidant potential, but research is limited compared to more established olive-derived ingredients like olive oil or leaf extract.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Onsen-Sui

Water, Butylene Glycol, Glycerin, Dipropylene Glycol, PEG-60 Hydrogenated Castor Oil, Phenoxyethanol, Chlorphenesin, Sodium Hyaluronate, Hydrolyzed Collagen, Aloe Barbadensis Leaf Extract, Camellia Sinensis Leaf Extract, Chamomilla Recutita (Matricaria) Flower Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Thymus Vulgaris (Thyme) Extract, Salvia Officinalis (Sage) Leaf Extract, Lavandula Angustifolia (Lavender) Flower Extract, Citrus Limon (Lemon) Fruit Extract, Citrus Aurantium Dulcis (Orange) Fruit Extract, Citrus Paradisi (Grapefruit) Fruit Extract, Vitis Vinifera (Grape) Seed Extract, Tocopherol, Ascorbic Acid, Retinyl Palmitate, Biotin, Folic Acid, Niacinamide, Panthenol, Pyridoxine HCl, Riboflavin, Thiamine HCl, Cyanocobalamin, Zinc PCA, Copper PCA, Magnesium PCA, Manganese PCA, Potassium PCA, Silica, Sodium PCA, Hydrolyzed Elastin, Hydrolyzed Keratin, Hydrolyzed Silk, Hydrolyzed Wheat Protein, Hydrolyzed Soy Protein, Hydrolyzed Rice Protein, Hydrolyzed Oat Protein, Hydrolyzed Corn Protein, Hydrolyzed Potato Protein, Hydrolyzed Yeast Protein, Hydrolyzed Milk Protein, Hydrolyzed Egg Protein, Hydrolyzed Fish Collagen, Hydrolyzed Shark Cartilage, Hydrolyzed Chondroitin Sulfate, Hydrolyzed Glycosaminoglycans, Hydrolyzed Hyaluronic Acid, Hydrolyzed Keratin, Hydrolyzed Silk, Hydrolyzed Wheat Protein, Hydrolyzed Soy Protein, Hydrolyzed Rice Protein, Hydrolyzed Oat Protein, Hydrolyzed Corn Protein, Hydrolyzed Potato Protein, Hydrolyzed Yeast Protein, Hydrolyzed Milk Protein, Hydrolyzed Egg Protein, Hydrolyzed Fish Collagen, Hydrolyzed Shark Cartilage, Hydrolyzed Chondroitin Sulfate, Hydrolyzed Glycosaminoglycans, Hydrolyzed Hyaluronic Acid

3.8

Onsen-Sui is a multi-ingredient blend that mimics the benefits of hot spring water, offering hydration, soothing effects, and a cocktail of antioxidants and nutrients for the skin.

Irritation

low

Source

mixed

beautyskincarehumectantantioxidant
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Humectant

Ornithine

Ornithine

3.8

Ornithine is a gentle amino acid that helps maintain skin hydration and supports a healthy skin barrier.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Orotic Acid

OROTIC ACID

3.5

Orotic acid is a gentle hydrating ingredient with some antioxidant potential, but research on its topical benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Ozonized Glycerin

OZONIZED GLYCERIN

4.0

Ozonized glycerin is a gentle, multi-tasking ingredient that hydrates while offering soothing and antimicrobial benefits, making it a promising option for acne-prone or sensitive skin.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantsoothing
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Humectant

Palmaria Palmata Powder

Palmaria Palmata Powder

4.0

A gentle, nutrient-packed seaweed powder that hydrates and soothes skin without irritation.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Humectant

Palmitoyl Hyaluronate

Palmitoyl Hyaluronate

4.2

A lipid-modified hyaluronic acid that may cling to skin longer than standard hyaluronic acid, offering targeted hydration.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Pantethine

Pantethine

4.0

Pantethine is a gentle, moisturizing derivative of vitamin B5 that helps support the skin barrier and calm irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectantsoothing
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Humectant

Panthenol

Panthenol

4.5

Panthenol is a well-tolerated humectant that helps hydrate and soothe the skin while supporting the skin barrier.

Irritation

low

Source

semi-synthetic

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Humectant

Panthenyl Ethyl Ether

Panthenyl Ethyl Ether

4.0

Panthenyl Ethyl Ether is a gentle, modified form of vitamin B5 that helps hydrate and condition skin without the stickiness of traditional humectants.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Panthenyl Ethyl Ether Acetate

Panthenyl Ethyl Ether Acetate

4.0

A gentle, advanced version of panthenol that helps hydrate and soothe skin with better absorption than standard pro-vitamin B5.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Pantolactone

Pantolactone

4.0

Pantolactone is a gentle humectant that helps skin retain moisture and improves product texture, but it's less studied than its parent compound, panthenol.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Pantothenamide MEA

Pantothenamide MEA

4.0

Pantothenamide MEA is a gentle, vitamin B5-derived humectant that helps hydrate and soothe the skin without common irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Pantothenic Acid

Pantothenic Acid

4.0

Pantothenic acid is a gentle, water-soluble vitamin that helps hydrate and soothe the skin, making it a solid choice for most skin types, especially dry or sensitive skin.

Irritation

low

Source

natural

beautyskincarehumectant
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Exfoliant

Papain Beta-Glucan

Papain, Beta-Glucan

3.8

A dual-action ingredient that gently exfoliates dead skin cells while helping to calm and hydrate the skin.

Irritation

moderate

Source

mixed

beautyskincareexfolianthumectant
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Exfoliant

Papaya Ferment Extract

LACTOBACILLUS/PAPAYA FRUIT FERMENT EXTRACT

4.0

A gentle, probiotic-based exfoliant that brightens and hydrates without harsh chemicals.

Irritation

low

Source

biotech

beautyskincareexfolianthumectant
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Humectant

Papaya Fruit Water

Carica Papaya (Papaya) Fruit Water

3.8

Papaya Fruit Water offers gentle hydration and mild enzymatic exfoliation, but its benefits are less concentrated than papaya extract or pure enzymes.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Parachlorella Exopolysaccharides

PARACHLORELLA BEIJERINCKII EXOPOLYSACCHARIDES

4.0

A gentle, algae-derived humectant that helps hydrate and soothe the skin while forming a light protective film.

Irritation

low

Source

natural

beautyskincarehumectantfilm-former
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