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

Humectant

Hydrolyzed Linseed Seed

HYDROLYZED LINSEED SEED

4.0

Hydrolyzed linseed seed is a gentle, plant-derived humectant that helps attract moisture to the skin and may calm irritation.

Irritation

low

Source

natural

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Humectant

Hydrolyzed London Rocket Seedcake

Hydrolyzed Sisymbrium Irio Seedcake

3.8

A gentle, plant-derived protein that helps hydrate and smooth the skin, though research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Hair conditioning agent

Hydrolyzed Lupine Protein

Hydrolyzed Lupine Protein

4.0

Hydrolyzed lupine protein is a gentle, plant-based protein that helps strengthen hair and lightly moisturize skin without irritation.

Irritation

low

Source

natural

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Skin Conditioning

Hydrolyzed Maca Root

Hydrolyzed Lepidium Meyenii Root

4.0

A gentle, antioxidant-rich ingredient that helps condition and protect the skin without irritation.

Irritation

low

Source

natural

beautyskincareconditioning agent
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Antioxidant

Hydrolyzed Maca Root Extract

Hydrolyzed Lepidium Meyenii Root Extract

3.8

A gentle antioxidant extract from maca root that may help protect skin from environmental stress, though research is still early.

Irritation

low

Source

natural

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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

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Humectant

Hydrolyzed Malt Extract

Hydrolyzed Malt Extract

4.0

A gentle, naturally-derived humectant that helps hydrate and soothe the skin, suitable for most skin types.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Mango Extract

Hydrolyzed Mangifera Indica Juice Extract

4.0

A gentle, antioxidant-rich mango extract that helps hydrate and protect skin from environmental stress, suitable for most skin types.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Mango Fruit

Hydrolyzed Mango Fruit

4.0

A gentle, water-soluble mango derivative that hydrates and provides antioxidant support, suitable for most skin types.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Mango Juice Extract

Hydrolyzed Mango Juice Extract

4.2

A gentle, plant-derived humectant that helps hydrate and condition the skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Mangosteen Extract

Hydrolyzed Garcinia Mangostana Fruit Extract

4.0

A gentle antioxidant extract from mangosteen that may help protect skin from environmental stress and support a more even tone.

Irritation

low

Source

natural

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Film Former

Hydrolyzed Maple Sycamore Protein

Hydrolyzed Maple Sycamore Protein

3.8

A gentle, plant-based protein that may help strengthen hair and temporarily smooth skin, but research is limited compared to more established proteins like keratin or collagen.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Melon Fruit

Hydrolyzed Melon Fruit Extract

4.0

A gentle, antioxidant-rich fruit extract that helps hydrate and protect the skin from environmental stress.

Irritation

low

Source

natural

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Hair Conditioner

Hydrolyzed Milk Protein Derivative

Hydroxypropyltrimonium Hydrolyzed Milk Protein

4.0

A gentle conditioning ingredient derived from milk protein that helps hair feel softer and more manageable without heavy buildup.

Irritation

low

Source

semi-synthetic

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Humectant

Hydrolyzed Millet

Hydrolyzed Millet

4.0

Hydrolyzed millet is a gentle, plant-based humectant that helps hydrate and soften skin without irritation.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Millet Seed Extract

Hydrolyzed Millet Seed Extract

4.0

A mild, natural humectant that helps attract moisture to the skin and may offer antioxidant benefits, but research is still limited.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Milt Extract

Hydrolyzed Milt Extract

3.8

A gentle, protein-based humectant from fish milt that helps hydrate and soothe skin, but research is still early and sourcing may raise ethical or allergy concerns.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Mint & Fruit Complex

Hydrolyzed Fruit/Mentha Arvensis Leaf/Root Extract

3.8

A gentle botanical blend that may help calm skin and provide antioxidant support, though research on the hydrolyzed form is limited.

Irritation

low

Source

natural

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Soothing Agent

Hydrolyzed Mugwort Leaf

Hydrolyzed Artemisia Vulgaris Leaf

4.0

A gentle, antioxidant-rich ingredient derived from mugwort that may help calm irritated skin and support a healthy-looking complexion.

Irritation

low

Source

natural

beautyskincaresoothing
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Antioxidant

Hydrolyzed Mulberry Fruit

Hydrolyzed Mulberry Fruit

4.0

A gentle antioxidant-rich fruit extract that may help brighten skin and fight free radical damage.

Irritation

low

Source

natural

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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
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Film Former

Hydrolyzed Mussel Byssus

Hydrolyzed Mytilus Edulis Byssus

3.8

A gentle, protein-based ingredient that forms a protective film on skin to help retain moisture and support a smoother appearance.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Mustard Seed Extract

Hydrolyzed Brassica Alba Seed Extract

4.0

A gentle, plant-based humectant that helps skin retain moisture and feel smooth, though research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Myrtle Leaf Extract

Hydrolyzed Myrtus Communis Leaf Extract

4.0

A gentle, antioxidant-rich botanical extract that helps soothe and protect skin, though research is still emerging.

Irritation

low

Source

natural

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Soothing Agent

Hydrolyzed Nettle Leaf Extract

Hydrolyzed Urtica Dioica (Nettle) Leaf Extract

4.0

A gentle, antioxidant-rich botanical extract that may help calm irritation and support skin barrier function.

Irritation

low

Source

natural

beautyskincaresoothing
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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
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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

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Hair Conditioning Agent

Hydrolyzed Oat Protein (Quaternized)

HYDROXYPROPYLTRIMONIUM HYDROLYZED OAT PROTEIN

4.3

A gentle, positively charged oat protein that clings to hair and skin to reduce frizz, add softness, and improve moisture retention without heavy buildup.

Irritation

low

Source

semi-synthetic

beautyskincarehaircareconditioning agent
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Humectant

Hydrolyzed Oats

Hydrolyzed Oats

4.5

Hydrolyzed oats are a gentle, multi-tasking ingredient that soothes, moisturizes, and protects sensitive or irritated skin.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Hydrolyzed Olive Fruit

Hydrolyzed Olive Fruit

4.0

A gentle, water-soluble olive derivative that hydrates and helps protect skin from environmental stress without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectantantioxidant
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Antioxidant

Hydrolyzed Olive Leaf Extract

Hydrolyzed Olive Leaf Extract

4.0

A gentle antioxidant extract from olive leaves that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Oryzanol

Hydrolyzed Oryzanol

4.0

Hydrolyzed Oryzanol is a gentle, water-soluble rice bran derivative that hydrates and protects skin without clogging pores.

Irritation

low

Source

natural

beautyskincarehumectant
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Hair Conditioning Agent

Hydrolyzed Oxidized Keratin

HYDROLYZED OXIDIZED KERATIN

4.0

A gentle, protein-based ingredient that helps strengthen and repair damaged hair by filling in gaps in the hair shaft.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Oyster Extract

HYDROLYZED OYSTER EXTRACT

3.8

A gentle, hydrating marine extract that may help soothe and condition the skin, though research is still emerging.

Irritation

low

Source

natural

beautyskincarehumectant
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Skin Conditioning Agent

Hydrolyzed Oyster Shell Extract

Hydrolyzed Oyster Shell Extract

3.8

A gentle, mineral-rich extract that may help soothe and condition the skin, but research is still early.

Irritation

low

Source

natural

beautyskincareskin conditioning
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Surfactant

Hydrolyzed Palm Sophorolipids

Hydrolyzed Palm Sophorolipids

4.0

A mild, biodegradable surfactant that cleanses without stripping the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

biotech

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Antioxidant

Hydrolyzed Palo Verde Bark

Hydrolyzed Cercidium Floridum Bark

3.8

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

Irritation

low

Source

natural

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Exfoliant

Hydrolyzed Papaya Fruit

Hydrolyzed Papaya Fruit

4.0

A gentle fruit-derived exfoliant that dissolves dead skin cells without harsh scrubbing, ideal for sensitive skin.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Passion Fruit Extract

Hydrolyzed Passiflora Alata Fruit

4.0

A gentle, antioxidant-rich fruit extract that helps hydrate and protect skin, though research on this specific form is still emerging.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Pea

Hydrolyzed Pea

4.2

A gentle, plant-based protein that helps hydrate and soothe the skin, making it a great option for sensitive or dry skin types.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Pea Protein

Hydrolyzed Pea Protein

4.0

A gentle, plant-based protein that helps strengthen hair and lightly moisturize skin without common allergens.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Pearl

Hydrolyzed Pearl

3.8

Hydrolyzed Pearl is a gentle, natural humectant that may help support skin hydration and a brighter appearance, but research is still limited.

Irritation

low

Source

natural

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Humectant

Hydrolyzed Pectin

Hydrolyzed Pectin

4.0

Hydrolyzed Pectin is a gentle, plant-derived humectant that helps attract moisture to the skin and may support a healthy-looking skin barrier.

Irritation

low

Source

natural

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Antioxidant

Hydrolyzed Perilla Callus Extract

Hydrolyzed Perilla Ocymoides Callus Extract

4.0

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

Irritation

low

Source

biotech

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Antioxidant

Hydrolyzed Pine Leaf Extract

Hydrolyzed Pinus Densiflora Leaf Extract

4.0

A gentle, antioxidant-rich pine needle extract that may help calm skin and fight environmental stress, though human studies are limited.

Irritation

low

Source

natural

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Exfoliant

Hydrolyzed Pineapple Fruit

HYDROLYZED ANANAS SATIVUS FRUIT

4.0

A gentle, fruit-derived exfoliant that helps smooth skin texture without harsh scrubbing, thanks to natural enzymes and antioxidants.

Irritation

low

Source

natural

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