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 2,268
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

Hydrogenated Tallow Glyceride Citrate

Hydrogenated Tallow Glyceride Citrate

3.8

A gentle, semi-synthetic emollient that softens skin and improves product texture, but its animal-derived origin may not suit all preferences.

Irritation

low

Source

semi-synthetic

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Emollient

Hydrogenated Tamanu Oil

Hydrogenated Calophyllum Inophyllum Seed Oil

4.0

Hydrogenated tamanu oil is a stable, non-greasy emollient that helps soften and soothe the skin without the strong scent or staining of raw tamanu oil.

Irritation

low

Source

semi-synthetic

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Emollient

Hydrogenated Tridodecene

HYDROGENATED TRIDODECENE

4.0

A lightweight, non-greasy synthetic emollient that helps products glide on smoothly without clogging pores.

Irritation

low

Source

synthetic

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Emollient

Hydrogenated Vegetable Oil

Hydrogenated Vegetable Oil

4.0

A safe, plant-derived thickener and emollient that helps lock in moisture but may clog pores for some skin types.

Irritation

low

Source

semi-synthetic

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Emollient

Hydrogenated Walnut Seed Oil

Hydrogenated Juglans Regia (Walnut) Seed Oil

3.8

A hydrogenated nut oil that adds richness and slip to formulas, but may be comedogenic for some and is unsuitable for nut-allergic individuals.

Irritation

low

Source

semi-synthetic

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Humectant

Hydrolyzed Beeswax

Hydrolyzed Beeswax

4.0

A gentle, water-soluble beeswax derivative that hydrates and helps maintain the skin barrier without the heavy feel of regular beeswax.

Irritation

low

Source

natural

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Emollient

Hydrolyzed Cocoa Butter

Hydrolyzed Theobroma Cacao Seed Butter

4.0

A lighter, water-friendly version of cocoa butter that hydrates and softens skin without clogging pores.

Irritation

low

Source

semi-synthetic

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Emollient

Hydrolyzed Horse Fat Extract

HYDROLYZED HORSE FAT EXTRACT

3.5

An unusual emollient that may help soften and condition skin, but research is very limited and it may not suit acne-prone skin.

Irritation

low

Source

natural

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Emollient

Hydrolyzed Jojoba Esters

HYDROLYZED JOJOBA ESTERS

4.5

A lightweight, non-greasy moisturizer derived from jojoba oil that hydrates and softens skin and hair with minimal irritation risk.

Irritation

low

Source

natural

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Emollient

Hydrolyzed Lecithin

Hydrolyzed Lecithin

4.3

A gentle, skin-identical ingredient that helps restore moisture and strengthen the skin barrier without clogging pores.

Irritation

low

Source

semi-synthetic

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Emollient

Hydroxycetyl Isostearate

Hydroxycetyl Isostearate

4.0

Hydroxycetyl Isostearate is a gentle, non-greasy emollient that helps soften and smooth the skin without clogging pores.

Irritation

low

Source

synthetic

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Emollient

Hydroxylated Jojoba Oil

HYDROXYLATED JOJOBA OIL

4.0

A stable, non-greasy emollient that mimics the skin's natural oils, ideal for dry or sensitive skin.

Irritation

low

Source

semi-synthetic

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Emollient

Hydroxylated Lanolin

Hydroxylated Lanolin

3.8

A water-friendly version of lanolin that softens skin without the heavy, sticky feel, but may still be problematic for those with wool allergies or acne-prone skin.

Irritation

low

Source

semi-synthetic

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Emollient

Hydroxystearamide MEA

Hydroxystearamide MEA

3.8

A gentle, synthetic emollient that softens skin and improves product texture with a low risk of irritation.

Irritation

low

Source

synthetic

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Emollient

Hydroxystearyl Alcohol

Hydroxystearyl Alcohol

4.0

A gentle fatty alcohol that softens skin and improves product texture without common irritation.

Irritation

low

Source

semi-synthetic

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Emollient

Hyptis Suaveolens Seed Oil

HYPTIS SUAVEOLENS SEED OIL

3.8

A gentle, plant-based oil that helps soften and condition skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

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Emollient

Irvingia Gabonensis Kernel Butter

IRVINGIA GABONENSIS KERNEL BUTTER

4.0

A nourishing, non-greasy butter that softens skin and helps maintain moisture, but its high price and limited research on specific benefits are worth noting.

Irritation

low

Source

natural

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Emollient

Isamyl Cocoate

ISOAMYL COCOATE

4.5

A lightweight, plant-based emollient that softens skin without clogging pores or feeling heavy.

Irritation

low

Source

natural

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Emollient

Isamyl Stearate

ISOAMYL STEARATE

4.0

A lightweight, plant-based emollient that hydrates and softens skin without clogging pores or leaving a heavy residue.

Irritation

low

Source

natural

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Emollient

Isatis Seed Oil

Isatis Tinctoria Seed Oil

4.0

A lightweight, linoleic-rich oil that moisturizes without clogging pores, though research on its unique benefits is still emerging.

Irritation

low

Source

natural

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Emollient

Isoamyl Caprylate/Caprate

Isoamyl Caprylate/Caprate

4.3

A plant-derived emollient that hydrates without heaviness, making it a great choice for oily or combination skin.

Irritation

low

Source

natural

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Emollient

Isoamyl Heptanoate

ISOAMYL HEPTANOATE

4.0

A lightweight synthetic ester that softens skin without a greasy feel, generally well-tolerated.

Irritation

low

Source

synthetic

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Emollient

Isoamyl Laurate

Isoamyl Laurate

4.3

A silky, non-greasy emollient that softens skin without clogging pores, ideal for lightweight formulas.

Irritation

low

Source

natural

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Emollient

Isoamyl Meadowfoamate

ISOAMYL MEADOWFOAMATE

4.5

A silky, non-greasy emollient derived from meadowfoam seed oil that hydrates without clogging pores.

Irritation

low

Source

semi-synthetic

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Emollient

Isoamyl Octanoate

Isoamyl Octanoate

4.0

A silky, non-greasy emollient that helps other ingredients absorb better and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

natural

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Emollient

Isoamyl Olivate

Isoamyl Olivate

4.5

A lightweight, non-greasy emollient from olive oil that hydrates and improves the feel of skincare products.

Irritation

low

Source

semi-synthetic

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Emollient

Isoamyl Palmitate/Stearate

Isoamyl Palmitate/Stearate

4.0

A lightweight, plant-based emollient that softens skin without clogging pores, ideal for oily and combination skin types.

Irritation

low

Source

natural

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Emollient

Isoamyl Valerate

Isoamyl Valerate

4.0

A lightweight, non-greasy emollient that softens skin without clogging pores, ideal for oilier or acne-prone skin types.

Irritation

low

Source

synthetic

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Emollient

Isobornyl Propionate

ISOBORNYL PROPIONATE

4.0

Isobornyl Propionate is a lightweight synthetic emollient that helps skincare products spread smoothly without leaving a heavy or greasy residue.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Hexanoate

ISOBUTYL HEXANOATE

4.0

A lightweight synthetic ester that softens skin and helps other ingredients spread evenly, with a low risk of irritation.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Isostearate

Isobutyl Isostearate

3.8

A lightweight synthetic emollient that softens skin and improves product feel, but may clog pores for some users.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Meadowfoamate

Isobutyl Meadowfoamate

4.3

A silky, non-greasy emollient derived from meadowfoam seed oil that spreads easily and leaves skin feeling smooth without clogging pores.

Irritation

low

Source

semi-synthetic

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Emollient

Isobutyl Myristate

Isobutyl Myristate

3.5

A lightweight synthetic emollient that makes products feel silky, but may clog pores for acne-prone skin.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Palmitate

Isobutyl Palmitate

3.5

A lightweight synthetic emollient that softens skin but may clog pores for some people.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Pelargonate

ISOBUTYL PELARGONATE

4.0

A lightweight synthetic ester that softens skin without feeling greasy, with a low risk of irritation or clogged pores.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Ricinoleate

ISOBUTYL RICINOLEATE

4.0

A gentle, non-greasy emollient that softens skin and helps other ingredients spread smoothly.

Irritation

low

Source

semi-synthetic

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Emollient

Isobutyl Stearate

ISOBUTYL STEARATE

3.5

A lightweight synthetic emollient that softens skin but may clog pores for some people.

Irritation

low

Source

synthetic

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Emollient

Isobutyl Tallowate

ISOBUTYL TALLOWATE

3.5

Isobutyl Tallowate is a semi-synthetic emollient that softens skin but may be comedogenic for acne-prone individuals.

Irritation

low

Source

semi-synthetic

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Emollient

Isobutylated Lanolin Oil

ISOBUTYLATED LANOLIN OIL

3.5

A modified lanolin oil that moisturizes and smooths skin, but may clog pores for some people.

Irritation

low

Source

semi-synthetic

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