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 20,303
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

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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

beautyskincarehumectant
Read ingredient review

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
Read ingredient review

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

beautyskincareantioxidant
Read ingredient review

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

beautyskincareemollient
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

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
Read ingredient review

Exfoliant

Passion Fruit Seed Acid

Passiflora Edulis Seed Acid

4.0

A mild, natural exfoliant derived from passion fruit seeds that gently resurfaces skin without harsh irritation.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Emollient

Passion Fruit Seed Oil

Passiflora Edulis Seed Oil

4.3

A gentle, non-greasy oil that hydrates and protects skin with essential fatty acids and antioxidants.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Emollient

Passion Fruit Seed Oil PEG-8 Esters

PASSIFLORA EDULIS SEED OILS PEG-8 ESTERS

4.0

A gentle, water-friendly emollient that brings the nourishing qualities of passion fruit seed oil into water-based formulas without greasiness.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Humectant

Passion Fruit Water

Passiflora Edulis Fruit Water

4.0

A gentle, hydrating water alternative that adds light antioxidant benefits and a subtle fruity scent.

Irritation

low

Source

natural

beautyskincarehumectant
Read ingredient review

Antioxidant

Passionflower Callus Extract

Passiflora Alata Callus Extract

4.0

A gentle, lab-grown plant extract that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Antioxidant

Passionflower Extract

PASSIFLORA CAERULEA FLOWER EXTRACT

3.8

A gentle, antioxidant-rich plant extract that may help calm skin and fight free radical damage, though human studies are limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Passionflower Seed Oil

PASSIFLORA INCARNATA SEED OIL

4.3

A nourishing, non-greasy oil that helps soften skin and support a healthy moisture barrier without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Exfoliant

Passionflower Seed Powder

Passiflora Incarnata Seed Powder

3.8

A gentle, natural exfoliant that helps polish skin without harsh microbeads, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Soothing Agent

Passionflower Water

PASSIFLORA INCARNATA WATER

4.0

A mild, water-based botanical that helps calm and hydrate the skin, ideal for sensitive or irritated complexions.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Emollient

Patauá Oil

OENOCARPUS BATAUA SEED OIL

4.3

Patauá oil is a lightweight, non-greasy Amazonian oil that deeply moisturizes and softens skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Antioxidant

Patchouli Flower Extract

Pogostemon Cablin Flower Extract

3.8

Patchouli flower extract is a gentle botanical antioxidant that may help calm skin and fight free radicals, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Patchouli Leaf Oil

POGOSTEMON CABLIN LEAF OIL

3.8

Patchouli Leaf Oil adds a warm, earthy scent to products and may offer mild antioxidant benefits, but it's primarily a fragrance ingredient with limited direct skincare research.

Irritation

low

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Patchouli Leaf Water

Pogostemon Cablin Leaf Water

3.8

Patchouli Leaf Water offers a gentle, aromatic way to refresh skin with mild astringent and soothing benefits, but research is limited.

Irritation

low

Source

natural

beautyskincarebotanical
Read ingredient review

Antioxidant

Patchouli Leaf/Stem Extract

Pogostemon Cablin Leaf/Stem Extract

3.8

Patchouli extract offers antioxidant and soothing benefits, but research on its topical effects is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Paulownia Extract

PAULOWNIA IMPERIALIS BARK/FLOWER/LEAF EXTRACT

3.8

A gentle, antioxidant-rich botanical extract from the Paulownia tree that may help calm skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Antioxidant

Paulownia Leaf Extract

Paulownia Tomentosa Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Paulownia Wood Extract

PAULOWNIA TOMENTOSA WOOD EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Pavlova Lutheri Extract

PAVLOVA LUTHERI EXTRACT

4.0

A gentle marine-derived antioxidant that helps protect skin from environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Pawpaw Fruit Extract

Asimina Triloba Fruit Extract

3.8

A gentle, antioxidant-rich fruit extract that may help soothe skin and protect against environmental stress, though research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Pawpaw Leaf Extract

ASIMINA TRILOBA LEAF EXTRACT

3.8

A gentle, antioxidant-rich leaf extract that may help calm skin and fight environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review