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 20,769
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

Fragrance

Pandan Leaf Oil

PANDANUS ODORATISSIMUS OIL

3.8

Pandan leaf oil adds a pleasant natural fragrance and mild antioxidant benefits, but its strong aroma and limited research mean it's best for those who enjoy botanical scents and have no fragrance sensitivities.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Pandan Seed Extract

Pandanus Odoratissimus Seed Extract

3.8

A gentle, plant-based antioxidant extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Pandan Stamen Extract

Pandanus Odoratissimus Stamen Extract

3.8

A gentle, aromatic plant extract with antioxidant potential, but limited research on its specific benefits for skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Panduratin A

Panduratin A

3.8

A plant-derived compound with promising antioxidant and anti-inflammatory effects, but human skincare research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Emollient

Pangium Edule Kernel Oil

Pangium Edule Kernel Oil

3.8

A gentle, plant-based oil that hydrates and softens skin, but scientific research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing Agent

Pantetheine Sulfonate

Pantetheine Sulfonate

4.0

A gentle, vitamin B5-derived ingredient that helps calm irritation and support the skin barrier — a good option for sensitive or reactive skin.

Irritation

low

Source

semi-synthetic

beautyskincaresoothing agent
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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

beautyskincarehumectant
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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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Skin conditioning agent

Panthenyl Ethyl Ether Benzoate

Panthenyl Ethyl Ether Benzoate

3.8

A gentle, modified form of vitamin B5 that helps condition skin and hair with a silky feel, but research on this specific derivative is limited.

Irritation

low

Source

semi-synthetic

beautyskincareconditioning agent
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Skin conditioning agent

Pantoea Agglomerans Ferment Lysate

PANTOEA AGGLOMERANS FERMENT LYSATE EXTRACT

4.0

A gentle, microbiome-friendly ingredient that may help calm sensitive skin and strengthen the skin barrier, though research is still early.

Irritation

low

Source

biotech

beautyskincaremicrobiome
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Soothing Agent

Pantoea Vagans Ferment Filtrate

PANTOEA VAGANS FERMENT FILTRATE EXTRACT

3.8

A gentle, probiotic-based ingredient that may help calm skin and support a balanced microbiome, though research is still early.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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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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Skin conditioning agent

Pantothenoyl Dipeptide-13

Pantothenoyl Dipeptide-13

4.0

A synthetic peptide that pairs vitamin B5 with amino acids to help strengthen the skin barrier and improve hydration, though research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
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Exfoliant

Papain

Papain

4.0

Papain is a gentle enzyme exfoliant from papaya that helps soften and smooth skin by dissolving dead cells, but it can be irritating for sensitive skin if overused.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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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

Papain Crosspolymer

Carbomer/Papain Crosspolymer

4.0

A gentle enzyme exfoliant that helps smooth skin without harsh scrubbing, but may not be suitable for very sensitive or compromised skin.

Irritation

low

Source

semi-synthetic

beautyskincareexfoliant
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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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Soothing Agent

Paper Birch Bark Extract

Betula Papyrifera Bark Extract

4.0

A gentle, antioxidant-rich botanical extract that helps calm irritated skin and protect against environmental stress.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Skin brightener

Paper Mulberry Bark Extract

BROUSSONETIA PAPYRIFERA BARK EXTRACT

4.0

A gentle plant extract that may help even out skin tone and protect against environmental damage, but more human studies are needed to confirm its brightening effects.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Paper Mulberry Callus Extract

BROUSSONETIA KAZINOKI CALLUS CULTURE EXTRACT

4.0

A gentle, lab-grown plant extract that may help protect skin from environmental stress, but human research is still limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Skin Brightening Agent

Paper Mulberry Stem Extract

BROUSSONETIA KAZINOKI STEM EXTRACT

3.8

A gentle plant extract that may help even skin tone and protect against environmental damage, but research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Papyrus Leaf Cell Extract

Cyperus Papyrus Leaf Cell Extract

3.8

A gentle, plant-derived antioxidant that may help calm skin and protect against environmental stress, though research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Papyrus Stem Extract

Cyperus Papyrus Stem Extract

3.8

A gentle, plant-derived extract that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Para Grass Extract

BRACHIARIA MUTICA EXTRACT

3.5

A gentle, plant-based extract with antioxidant potential, but research on its skincare benefits is still limited.

Irritation

low

Source

natural

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Preservative

Parabens

Parabens (e.g., Methylparaben, Ethylparaben, Propylparaben, Butylparaben)

3.5

Parabens are effective, low-irritation preservatives, but consumer concerns about potential endocrine disruption have led many brands to seek alternatives.

Irritation

low

Source

synthetic

beautyskincarepreservative
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Preservative

Parabens (Methyl, Propyl, Butyl, Ethyl)

Methylparaben, Propylparaben, Butylparaben, Ethylparaben

3.5

Parabens are effective preservatives with a long safety record, but concerns about hormone disruption have led many to seek paraben-free alternatives.

Irritation

low

Source

synthetic

beautyskincarepreservative
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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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Antioxidant

Parachlorella Extract

Parachlorella Beijerinckii Extract

4.0

A gentle microalgae extract that may help calm skin and defend against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Occlusive

Paraffin

Paraffin

3.8

Paraffin is a highly effective moisturizer that seals in hydration, but it can feel heavy and may clog pores for some skin types.

Irritation

low

Source

synthetic

beautyskincareocclusive
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Antioxidant

Paraxanthine

Paraxanthine

3.8

Paraxanthine is a caffeine relative that may help firm skin and improve microcirculation, but research in topical cosmetics is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Paris Verticillata Leaf Extract

Paris Verticillata Leaf Extract

3.5

A traditional herbal extract with potential soothing and antioxidant benefits, but human skin research is very limited.

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing Agent

Parrot's Feather Extract

Myriophyllum Verticillatum Extract

3.8

A gentle, plant-derived extract that may help calm irritated skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing
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Antioxidant

Parsley Extract

Carum Petroselinum (Parsley) Extract

4.0

Parsley extract is a gentle, antioxidant-rich botanical that can help calm skin and provide a subtle brightening effect, but its benefits are modest compared to more potent actives.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Parsley Herb Extract

Carum Petroselinum (Parsley) Herb Extract

3.8

Parsley Herb Extract offers antioxidant benefits and mild soothing effects, but its concentration in formulas is typically low, limiting its standalone impact.

Irritation

low

Source

natural

beautyskincareantioxidant
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Fragrance

Parsley Leaf Oil

Petroselinum Crispum Leaf Oil

3.8

Parsley Leaf Oil adds a fresh herbal scent and antioxidant benefits, but it can be irritating for sensitive skin and is best used in low concentrations.

Irritation

moderate

Source

natural

beautyskincarefragrance
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Antioxidant

Parsley Leaf Powder

PETROSELINUM SATIVUM LEAF POWDER

3.8

Parsley Leaf Powder brings antioxidant and soothing benefits to skincare, but its effectiveness in finished products depends heavily on formulation and concentration.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Parsley Meristem Cell Extract

Petroselinum Crispum Meristem Cell

4.0

A gentle plant stem cell extract that may help protect skin from environmental stress, though human research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Parsley Seed Extract

Petroselinum Crispum Seed Extract

4.0

Parsley Seed Extract is a gentle antioxidant that may help protect skin from pollution and UV damage, but it's not a substitute for sunscreen.

Irritation

low

Source

natural

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Antioxidant

Parsley Seed Oil

Petroselinum Crispum Seed Oil

4.0

Parsley Seed Oil is a gentle antioxidant-rich oil that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Soothing agent

Parsnip Root Extract

PASTINACA SATIVA ROOT EXTRACT

3.8

Parsnip root extract is a gentle botanical with antioxidant potential, but research on its skincare benefits is still limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Humectant

Parsnip Root Juice

PASTINACA SATIVA ROOT JUICE

3.5

Parsnip Root Juice is a mild, water-based ingredient that adds light hydration and soothing benefits, but it lacks strong clinical backing compared to more established humectants.

Irritation

low

Source

natural

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Antioxidant

Passion Flower Callus Extract

PASSIFLORA COCCINEA CALLUS EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and fight environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Passion Flower Extract

PASSIFLORA EDULIS FLOWER EXTRACT

4.0

A gentle, antioxidant-rich flower extract that helps calm skin and protect against environmental stressors.

Irritation

low

Source

natural

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Emollient

Passion Fruit & Palm Amino Ester

Passiflora Edulis Seed Oil/Palm Oil Aminopropanediol Esters

4.0

A gentle, plant-derived emollient that softens skin and helps other ingredients spread evenly, with a low risk of irritation or clogged pores.

Irritation

low

Source

semi-synthetic

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Conditioning Agent

Passion Fruit & Palm Oil Conditioning Complex

PASSIFLORA EDULIS SEED OIL/PALM OIL/ AMINOPROPANEDIOL ESTERS ACETATE ETHYLDIMONIUM CHLORIDE

3.8

A gentle conditioning agent that helps soften hair and skin without heavy buildup, but its palm oil source raises sustainability questions.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Antioxidant

Passion Fruit Callus Culture Extract

PASSIFLORA EDULIS CALLUS CULTURE CONDITIONED MEDIA

4.0

A gentle, lab-grown passion fruit ingredient that may help protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Passion Fruit Extract

PASSIFLORA INCARNATA FRUIT EXTRACT

4.0

A gentle, antioxidant-rich fruit extract that helps soothe skin and protect against environmental damage, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Passion Fruit Meristem Cell Extract

Passiflora Edulis Meristem Cell Extract

4.0

A gentle, plant-derived antioxidant that may help protect skin from environmental stress and support a more even tone, though research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Passion Fruit Peel Extract

Passiflora Edulis Peel Extract

4.0

A gentle, antioxidant-rich extract that helps protect skin from environmental stress and may support a more even tone.

Irritation

low

Source

natural

beautyskincareantioxidant
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