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

Emollient

Acacia Flower Wax

Acacia Dealbata Flower Cera

4.0

A gentle, plant-derived wax that adds a smooth, velvety feel to balms and sticks without heavy greasiness.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Acacia Saligna Leaf Extract

Acacia Saligna Leaf Extract

3.5

A gentle botanical extract with antioxidant potential, but research on its specific skin benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Film Former

Acacia Senegal Gum Extract

Acacia Senegal Gum Extract

4.0

A gentle, plant-derived gum that helps smooth and soothe skin while creating a light, non-sticky protective film.

Irritation

low

Source

natural

beautyskincarefilm-former
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Film Former

Acacia Seyal Gum Extract

Acacia Seyal Gum Extract

3.8

A gentle, plant-based gum that helps form a light, soothing film on skin, but its benefits are mostly texture-related rather than deeply active.

Irritation

low

Source

natural

beautyskincarefilm-former
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Antioxidant

Acacia Victoriae Fruit Extract

Acacia Victoriae Fruit Extract

3.8

A gentle, antioxidant-rich botanical extract from an Australian native plant, best for soothing and protecting normal to dry skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acacia Victoriae Seed Extract

Acacia Victoriae Seed Extract

3.8

A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, but research is still early.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Emollient

Acacia Victoriae Seed Oil

ACACIA VICTORIAE SEED OIL

4.0

A gentle, plant-based oil that hydrates and softens skin with a light feel, though research on its benefits is still emerging.

Irritation

low

Source

natural

beautyskincareemollient
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Antioxidant

Açaí Berry Extract

Euterpe Edulis Juice Extract

4.0

Açaí berry extract is a gentle antioxidant-rich ingredient that helps protect skin from environmental stress and may calm minor irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Açaí Fruit Extract

Euterpe Oleracea Fruit Extract

4.0

Açaí fruit extract is a gentle, antioxidant-rich ingredient that helps defend the skin against free radicals and environmental damage, but its benefits are best supported by general antioxidant research rather than specific skin studies.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Açaí Palm Heart Extract

EUTERPE OLERACEA PALM HEART EXTRACT

3.8

A gentle, antioxidant-rich extract from açaí palm hearts that may help calm and protect skin, though research is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Açaí Pulp Powder

Euterpe Oleracea Pulp Powder

4.0

Açaí Pulp Powder is a gentle, antioxidant-packed ingredient that helps protect skin from environmental stress and supports a healthy-looking complexion.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Açaí Seed Powder

Euterpe Oleracea Seed Powder

3.8

A natural, gentle physical exfoliant from açaí seeds, suitable for most skin types but with limited research on its specific benefits.

Irritation

low

Source

natural

beautyskincareexfoliant
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Antioxidant

Acalypha Reptans Callus Extract

Acalypha Reptans Callus Culture Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acanthopanax Callus Extract

Acanthopanax Sessiliflorus Callus Extract

3.8

A gentle plant extract with antioxidant potential, but research is still early and benefits are not yet proven in human skin.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acanthopanax Root Extract

Acanthopanax Sessiliflorus Root Extract

3.8

A gentle botanical extract with antioxidant potential, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing Agent

Acanthus Mollis Leaf Extract

Acanthus Mollis Leaf Extract

3.8

A gentle botanical extract with soothing and antioxidant potential, but research on its cosmetic benefits is still limited.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Firming Agent

Acefylline Methylsilanol Mannuronate

Acefylline Methylsilanol Mannuronate

4.0

A science-backed firming ingredient that combines caffeine-like action with silicone and seaweed-derived acid to help tighten and smooth skin.

Irritation

low

Source

semi-synthetic

beautyskincareactive
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Antioxidant

Acer Tegmentosum Stem Extract

Acer Tegmentosum Stem Extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acerola Fruit Extract

Malpighia Punicifolia Fruit Extract

4.0

Acerola fruit extract is a gentle, vitamin-C-rich antioxidant that can help brighten skin and defend against environmental stress, though its vitamin C content may degrade quickly in formulas.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acerola Fruit Juice

Malpighia Glabra Fruit Juice

4.0

Acerola fruit juice is a gentle, natural source of vitamin C that can help brighten skin and fight free radical damage without the irritation of pure ascorbic acid.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acerola Fruit Powder

MALPIGHIA EMARGINATA FRUIT POWDER

4.0

Acerola fruit powder is a gentle, natural source of vitamin C that can help brighten skin and fight free radicals, but its effectiveness depends on formulation and stability.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acerola Fruit Water

Malpighia Glabra Fruit Water

4.0

Acerola fruit water is a gentle, antioxidant-rich hydrator that can help brighten and protect skin from environmental stress.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Acerola Seed Extract

MALPIGHIA EMARGINATA SEED EXTRACT

4.0

Acerola seed extract is a gentle, antioxidant-rich ingredient that helps protect skin from environmental stress, though research on its topical benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Acetaldehyde Diethyl Acetal

ACETALDEHYDE DIETHYL ACETAL

3.5

A synthetic fragrance ingredient that adds a fruity scent but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Acetaldehyde Dipropyl Acetal

ACETALDEHYDE DIPROPYL ACETAL

3.5

A synthetic fragrance ingredient that adds a fresh scent but offers no skincare benefit; safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Acetaldehyde Ethyl Cis-3-Hexenyl Acetal

ACETALDEHYDE ETHYL CIS-3-HEXENYL ACETAL

3.5

A synthetic fragrance ingredient that adds a fresh, green scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Acetaldehyde Phenethyl Propyl Acetal

ACETALDEHYDE PHENETHYL PROPYL ACETAL

3.5

A synthetic fragrance ingredient that adds a pleasant floral note but offers no skincare benefit and may be a concern for those with fragrance sensitivities.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Humectant

Acetamide MEA

ACETAMIDE MEA

3.8

Acetamide MEA is a synthetic humectant that helps hydrate skin and hair, but it is less common than alternatives like glycerin and may not suit those avoiding synthetic ingredients.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Hair Conditioner

Acetamidoamodimethicone

ACETAMIDOAMODIMETHICONE

4.0

A gentle silicone that improves hair feel and manageability with minimal risk of buildup.

Irritation

low

Source

synthetic

beautyhaircareconditioning agent
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Humectant

Acetamidoethoxyethanol

Acetamidoethoxyethanol

4.0

A gentle, synthetic humectant that helps hydrate the skin without common irritation or clogging.

Irritation

low

Source

synthetic

beautyskincarehumectant
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Antistatic Agent

Acetamidoethyl PG-Trimonium Chloride

Acetamidoethyl PG-Trimonium Chloride

4.0

A gentle synthetic conditioning ingredient that reduces frizz and static while improving the feel of hair and skin without heavy buildup.

Irritation

low

Source

synthetic

beautyskincarehaircareconditioning agent
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Antistatic Agent

Acetamidopropyl Trimonium Chloride

Acetamidopropyl Trimonium Chloride

4.0

A gentle antistatic ingredient that smooths hair without heavy buildup, making it a good choice for fine or easily weighed-down hair.

Irritation

low

Source

synthetic

beautyskincarehaircare
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UV Absorber

Acetaminosalol

Acetaminosalol

3.5

Acetaminosalol is a synthetic UV filter that helps protect skin from sun damage, but it may cause irritation for sensitive skin types.

Irritation

moderate

Source

synthetic

beautyskincaresunscreen
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pH Adjuster

Acetic Acid

Acetic Acid

3.5

Acetic acid is a gentle exfoliant and pH adjuster, but can be irritating at high concentrations.

Irritation

moderate

Source

natural

beautyskincarepH adjuster
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Film Former

Acetiminoacetoxy Methacrylate Polymer

TRIS(ACETIMINOACETOXYETHOXY METHACRYLATE) PPG-6 TRIMETHYLOLPROPANE

3.5

A synthetic film former that helps products stay put, but it's mostly used in specialty items like nail polish rather than everyday skincare.

Irritation

low

Source

synthetic

beautyskincarefilm-former
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Film Former

Acetoacetoxyethoxy Methacrylate

ACETOACETOXYETHOXY METHACRYLATE

3.0

A synthetic ingredient used in nail products to help coatings stick and last longer, but may cause irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautynail carefilm former
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Humectant

Acetoin

Acetoin

4.0

Acetoin is a gentle, natural humectant that helps hydrate skin and improve product texture without irritation.

Irritation

low

Source

natural

beautyskincarehumectant
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Fragrance

Acetonaphthone

1-ACETONAPHTHONE

3.0

A synthetic fragrance ingredient with limited safety data; best for those who tolerate added scents.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Solvent

Acetone

Acetone

2.0

Acetone is a powerful but harsh solvent best reserved for quick, targeted removal of nail polish or stubborn adhesives, not for daily facial skincare.

Irritation

high

Source

synthetic

beautyskincaresolvent
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Fragrance Ingredient

Acetophenone

ACETOPHENONE

3.5

Acetophenone is a synthetic fragrance ingredient that adds a sweet, almond-like scent; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
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Fragrance Ingredient

Acetophenone Ethylene Glycol Cyclic Acetal

ACETOPHENONE ETHYLENEGLYCOL CYCLIC ACETAL

3.5

A synthetic fragrance compound that adds a pleasant scent but offers no skincare benefits; safe at low concentrations but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Acetoxymethylnaphthalene

1-ACETOXY-2-METHYLNAPHTHALENE

3.0

A synthetic fragrance ingredient with limited safety data; best for those who tolerate synthetic scents well.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Humectant

Acetyl Arginine

Acetyl Arginine

4.0

A gentle, water-loving amino acid derivative that helps plump skin and support its natural moisture barrier without irritation.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Humectant

Acetyl Aspartic Acid

Acetyl Aspartic Acid

3.8

Acetyl Aspartic Acid is a gentle, water-soluble amino acid derivative that helps maintain skin hydration and supports a healthy skin barrier.

Irritation

low

Source

semi-synthetic

beautyskincarehumectant
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Skin conditioning agent

Acetyl Benzoyloxy Prasterone

ACETYL BENZOYLOXY PRASTERONE

3.5

A synthetic hormone derivative that may help support skin firmness, but research is limited and it may not suit sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincareanti-aging
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Anti-aging agent

Acetyl Beta-Alanyl Tripeptide-50

Acetyl Beta-Alanyl Tripeptide-50

4.0

A synthetic peptide that may help improve skin firmness and reduce fine lines, but more independent research is needed.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Surfactant

Acetyl Carboxymethyl Cocoyl Glycine

Acetyl Carboxymethyl Cocoyl Glycine

4.0

A mild, coconut-derived cleansing agent that effectively removes dirt and oil without stripping the skin’s natural moisture barrier.

Irritation

low

Source

semi-synthetic

beautyskincarecleanser
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Antioxidant

Acetyl Carnitine

Acetyl Carnitine

4.0

Acetyl Carnitine is a gentle antioxidant that may help protect skin from environmental stress and support collagen health, but research is still emerging.

Irritation

low

Source

semi-synthetic

beautyskincareantioxidant
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