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 577
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

Soothing Agent

Glutamylamidoethyl Imidazole

Glutamylamidoethyl Imidazole

3.8

A gentle, synthetic ingredient designed to calm irritated skin and reduce redness, though research is still emerging.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
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Soothing Agent

Glycyrrhetinic Acid

Glycyrrhetinic Acid

4.3

A gentle, plant-derived ingredient that helps calm redness and irritation without the side effects of stronger anti-inflammatories.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Glycyrrhetinyl Stearate

Glycyrrhetinyl Stearate

4.0

A gentle, oil-friendly derivative of licorice root that helps calm redness and soothe sensitive skin without irritation.

Irritation

low

Source

semi-synthetic

beautyskincaresoothing agent
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Soothing Agent

Glycyrrhizic Acid

GLYCYRRHIZIC ACID

4.3

A gentle, plant-derived ingredient that helps calm redness and irritation, making it a great choice for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Gorgonia Extract

Gorgonia Extract

3.5

A marine extract with potential calming benefits, but research is limited and sustainability concerns exist.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Goutweed Extract

AEGOPODIUM PODAGRARIA EXTRACT

3.8

A gentle plant extract with potential soothing and antioxidant benefits, but research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Grindelia Camporum Extract

GRINDELIA CAMPORUM EXTRACT

3.8

A gentle botanical extract with traditional use for calming irritated skin, though modern research is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Grindelia Extract

Grindelia Humilis Extract

3.8

Grindelia Extract is a gentle botanical with soothing potential, best for calming irritated or sensitive skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Gromwell Root Oil

LITHOSPERMUM ERYTHRORHIZON ROOT OIL

4.0

A gentle, antioxidant-rich oil from the gromwell root that helps calm skin and fight environmental stress.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Guaiazulene

Guaiazulene

4.0

Guaiazulene is a gentle, blue-pigmented compound from chamomile-like plants that helps calm redness and soothe sensitive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Harpagide

HARPAGIDE

3.8

Harpagide is a gentle, plant-derived compound that may help calm irritated skin and fight free radical damage, though research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hexyl Lauroyl Argininamide HCl

Hexyl Lauroyl Argininamide HCl

4.0

A gentle, lab-made ingredient that helps dial down skin reactivity and soothe irritation without harsh side effects.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hinoki Cypress Water

Chamaecyparis Obtusa Water

4.0

A gentle, aromatic water from the Hinoki cypress tree that may help soothe skin and provide a calming sensory experience, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hollyhock Root Extract

Althaea Rosea Root Extract

3.8

A gentle, plant-based extract that helps calm and hydrate the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Honeysuckle Ferment Filtrate

LACTOBACILLUS/HONEYSUCKLE FLOWER EXTRACT FERMENT FILTRATE

4.0

A gentle fermented ingredient that may help calm skin and provide antioxidant benefits, though research is still emerging.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Soothing Agent

Houttuynia Cordata Powder

Houttuynia Cordata Powder

4.0

A gentle, plant-based powder that helps calm irritated skin and provides antioxidant protection, ideal for sensitive or acne-prone skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Houttuynia Cordata Water

HOUTTUYNIA CORDATA FLOWER/LEAF/STEM WATER

4.2

A gentle, plant-derived water that helps calm irritation and provides antioxidant protection, ideal for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrogenated Bisabolol

Hydrogenated Bisabolol

4.5

A gentle, stabilized version of chamomile-derived bisabolol that helps calm irritated skin without causing breakouts.

Irritation

low

Source

semi-synthetic

beautyskincaresoothing agent
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Soothing Agent

Hydrogenated Saussurea Lappa Extract

SAUSSUREA LAPPA EXTRACT HYDROGENATED

3.8

A gentle, antioxidant-rich botanical extract that may help calm skin, but research is limited and hydrogenation alters its natural composition.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Hydrolyzed Agave Yeast Extract

Hydrolyzed Metschnikowia Agaves Extract

3.8

A gentle, biotech-derived extract that may help calm irritation and support skin hydration, though research is still emerging.

Irritation

low

Source

biotech

beautyskincaresoothing agent
Read ingredient review

Humectant

Hydrolyzed Aloe Leaf Extract

Hydrolyzed Aloe Barbadensis Leaf Extract

4.0

A gentle, water-soluble aloe derivative that hydrates and calms skin, ideal for sensitive or irritated complexions.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Humectant

Hydrolyzed Baobab Seed Extract

Hydrolyzed Adansonia Digitata Seed Extract

4.0

A gentle, plant-derived humectant that helps hydrate and calm the skin, with early research suggesting antioxidant benefits.

Irritation

low

Source

natural

beautyskincarehumectantsoothing agent
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Soothing Agent

Hydrolyzed Calendula Extract

HYDROLYZED CALENDULA OFFICINALIS FLOWER EXTRACT

4.0

A gentle, hydrolyzed version of calendula extract that soothes irritation and supports skin barrier function with low risk of irritation.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Hydrolyzed Coral

HYDROLYZED CORAL

3.5

Hydrolyzed coral is a mineral-rich ingredient that may help soothe and hydrate the skin, but scientific evidence is limited and sustainability concerns exist.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Humectant

Hydrolyzed Corallina Extract

Hydrolyzed Corallina Officinalis Extract

4.0

A gentle, hydrating seaweed extract that may help calm irritation and support the skin barrier.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Glycyrrhizinate

Hydrolyzed Glycyrrhizinate

4.3

A gentle, licorice-derived ingredient that helps calm redness and even out skin tone without irritation.

Irritation

low

Source

semi-synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Job's Tears Extract

Hydrolyzed Coix Lacryma-Jobi Ma-Yuen Seed Extract

4.0

A gentle, plant-derived extract that may help calm irritation and support skin hydration, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Humectant

Hydrolyzed Job's Tears Seed

HYDROLYZED COIX LACRYMA-JOBI MA-YUEN SEED

4.0

A gentle, plant-derived humectant that helps soothe and hydrate the skin, with some antioxidant potential.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Limonium Latifolium

HYDROLYZED LIMONIUM LATIFOLIUM

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Mallow Leaf Extract

Hydrolyzed Malva Sylvestris (Mallow) Leaf Extract

4.0

A gentle, plant-based ingredient that helps calm irritated skin and provides antioxidant protection without clogging pores.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Mullein Flower

Hydrolyzed Verbascum Thapsus Flower

3.8

A gentle, plant-based ingredient that may help calm irritation and provide antioxidant protection, though research is still early.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Nutgrass Root Extract

Hydrolyzed Cyperus Rotundus Root Extract

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Oat Flour

Hydrolyzed Oat Flour

4.5

Hydrolyzed oat flour is a gentle, soothing ingredient that calms irritation and supports the skin barrier, making it ideal for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Sponge

Hydrolyzed Sponge

3.8

Hydrolyzed Sponge is a gentle, marine-based ingredient that may help calm irritated skin and support moisture retention, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Sundew Leaf

HYDROLYZED DROSERA ROTUNDIFOLIA LEAF

3.8

A gentle, plant-derived ingredient that may help calm redness and provide antioxidant support, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Wild Pansy Extract

Hydrolyzed Viola Tricolor Extract

4.0

A gentle, antioxidant-rich botanical extract that may help calm irritated skin, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydrolyzed Wintergreen Extract

Hydrolyzed Wintergreen Extract

4.0

A gentle, antioxidant-rich botanical extract that helps calm skin and fight free radicals, but is not a substitute for medical treatment.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Hydroxyphenyl Glycinamide

Hydroxyphenyl Glycinamide

4.0

A gentle, lab-made ingredient that helps calm irritated skin and reduce redness without harsh side effects.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Iceland Moss Extract

CETRARIA ISLANDICA THALLUS EXTRACT

4.0

A gentle, natural extract that helps calm irritation and provides antioxidant protection, ideal for sensitive or reactive skin.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Imiloxan Hydrochloride

Imiloxan HCl

2.5

Imiloxan HCl is a synthetic compound with limited research in cosmetics; its safety and efficacy for skincare are not well-established.

Irritation

moderate

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Indigo Leaf Powder

Indigofera Tinctoria Leaf Powder

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Indolebutyroyl Aspartic Acid

Indolebutyroyl Aspartic Acid

3.8

A gentle, synthetic amino-acid derivative that may help calm irritation and reinforce the skin barrier, though research is still early.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Iritone

IRITONE

3.8

Iritone is a gentle, plant-derived ingredient that may help calm irritated skin, but research is limited and it's not a proven powerhouse.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Isocineole

Isocineole

3.8

Isocineole is a gentle, plant-derived compound that may help calm skin and provide a cooling sensation, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Isopentenyl Phenethyl Ether

2-ISOPENTENYL PHENETHYL ETHER

3.5

A synthetic compound that may help calm skin and support its natural defenses, but research is still early.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Isostearoyloxy Cyclohexylbutyramide

ISOSTEAROYLOXY CYCLOHEXYLBUTYRAMIDE

4.0

A synthetic soothing ingredient that mimics natural skin-signaling peptides to help reduce visible redness and discomfort.

Irritation

low

Source

synthetic

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Jack Bean Leaf Extract

Canavalia Ensiformis Leaf Extract

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing agent

Japanese Alder Leaf/Stem Water

Alnus Japonica Leaf/Stem Water

3.8

A gentle, water-based botanical extract that may help calm skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Japanese Butterbur Extract

PETASITES JAPONICUS LEAF/STEM EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Japanese Butterbur Leaf Extract

PETASITES JAPONICUS LEAF EXTRACT

3.8

A gentle botanical extract that may help calm irritated skin and provide antioxidant protection, but research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review

Soothing Agent

Jerusalem Artichoke Root Extract

Helianthus Tuberosus Root Extract

4.0

A gentle, plant-based extract that helps calm and hydrate the skin, ideal for sensitive or irritated complexions.

Irritation

low

Source

natural

beautyskincaresoothing agent
Read ingredient review