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

Solvent

SD Alcohol 38-C

SD ALCOHOL 38-C

3.5

SD Alcohol 38-C helps products dry quickly and feel light, but can be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

SD Alcohol 38-D

SD Alcohol 38-D

3.5

SD Alcohol 38-D is a fast-drying solvent that can help other ingredients penetrate, but it may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

SD Alcohol 38-F

SD ALCOHOL 38-F

3.5

SD Alcohol 38-F is a fast-evaporating solvent that can help products feel lightweight but may be drying or irritating for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
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Solvent

SD Alcohol 39-D

SD Alcohol 39-D

3.0

SD Alcohol 39-D is a fast-evaporating solvent that can help control oil and enhance product feel, but it may dry and irritate sensitive or dry skin.

Irritation

high

Source

synthetic

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Solvent

SD Alcohol 40-B

Alcohol Denat.

3.5

Effective for quick-drying and oil control, but can be drying and irritating for sensitive or dry skin types.

Irritation

moderate

Source

synthetic

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Solvent

SD Alcohol 46

SD ALCOHOL 46

3.5

SD Alcohol 46 helps products dry quickly and feel refreshing, but it can be drying and irritating for sensitive or dry skin types.

Irritation

moderate

Source

synthetic

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Antioxidant

Sea Aster Extract

Aster Tripolium Extract

4.0

A gentle, antioxidant-rich plant extract that may help calm skin and protect against environmental stress.

Irritation

low

Source

natural

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Antioxidant

Sea Bamboo Extract

Phyllospadix iwatensis extract

3.8

A gentle marine 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

Sea Blite Extract

Suaeda Maritima Flower/Leaf/Stem Extract

3.8

A gentle, antioxidant-rich extract from a salt-tolerant plant that may help calm and protect skin, though research is still early.

Irritation

low

Source

natural

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Antioxidant

Sea Blite Powder

Suaeda Maritima Flower/Leaf/Stem Powder

3.5

A gentle botanical powder from a salt-tolerant plant, offering antioxidant benefits but with limited research in cosmetic use.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Sea Buckthorn Callus Extract

HIPPOPHAE RHAMNOIDES CALLUS EXTRACT

4.0

A gentle, antioxidant-rich extract from sea buckthorn callus cells that may help soothe and protect the skin.

Irritation

low

Source

biotech

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Antioxidant

Sea Buckthorn Ferment Filtrate

SACCHAROMYCES/HIPPOPHAE RHAMNOIDES FRUIT FERMENT FILTRATE

4.0

A gentle fermented fruit extract that helps soothe and protect the skin with antioxidants.

Irritation

low

Source

biotech

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Antioxidant

Sea Buckthorn Ferment Oil

KLUYVEROMYCES/LACTOBACILLUS/HIPPOPHAE RHAMNOIDES OIL FERMENT FILTRATE

4.3

A fermented sea buckthorn oil that combines natural antioxidants with probiotic benefits for soothing and nourishing the skin.

Irritation

low

Source

biotech

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Antioxidant

Sea Buckthorn Fruit Water

Hippophae Rhamnoides Fruit Water

4.0

A gentle, antioxidant-rich water from sea buckthorn fruit that hydrates and soothes skin without the oiliness of the seed oil.

Irritation

low

Source

natural

beautyskincareantioxidant
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Exfoliant

Sea Buckthorn Husk Powder

HIPPOPHAE RHAMNOIDES HUSK POWDER

4.0

A gentle, natural exfoliating powder rich in antioxidants, ideal for sensitive skin types looking for mild physical exfoliation.

Irritation

low

Source

natural

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Antioxidant

Sea Buckthorn Kernel Extract

HIPPOPHAE RHAMNOIDES KERNEL EXTRACT

4.3

A gentle, antioxidant-rich oil extract that helps soothe and nourish the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sea Buckthorn Leaf Powder

Hippophae Rhamnoides Leaf Powder

3.8

A gentle, antioxidant-rich botanical powder that may help calm skin and provide mild exfoliation, though research on its topical benefits is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sea Buckthorn Seed Powder

HIPPOPHAE RHAMNOIDES SEED POWDER

4.0

A gentle, antioxidant-rich powder that can help soothe and lightly exfoliate skin without stripping it.

Irritation

low

Source

natural

beautyskincareantioxidant
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Absorbent

Sea Clay Extract

Sea Clay Extract

3.8

A gentle, mineral-rich clay extract that helps absorb excess oil and impurities without over-drying, suitable for most skin types.

Irritation

low

Source

natural

beautyskincareabsorbent
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Humectant

Sea Cucumber Ferment Filtrate

BACILLUS/SEA CUCUMBER FERMENT EXTRACT FILTRATE

3.8

A fermented sea cucumber extract that may help hydrate and calm the skin, but research is still early.

Irritation

low

Source

biotech

beautyskincarehumectant
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Antioxidant

Sea Fennel Callus Culture Filtrate

Crithmum Maritimum Callus Culture Filtrate

4.0

A gentle, lab-grown antioxidant from sea fennel that helps calm skin and fight environmental stress without irritation.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Sea Fennel Callus Extract

CRITHMUM MARITIMUM CALLUS EXTRACT

4.0

A gentle, antioxidant-rich extract from sea fennel callus that helps protect skin from environmental stress and supports a calm, even complexion.

Irritation

low

Source

biotech

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Antioxidant

Sea Fennel Powder

Crithmum Maritimum Powder

4.0

Sea fennel powder is a gentle botanical ingredient that may help calm skin and fight free radical damage, though research is still emerging.

Irritation

low

Source

natural

beautyskincarebotanical
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Antioxidant

Sea Firefly Ferment

PYROCYSTIS NOCTILUCA LYSATE

3.8

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

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Sea Grape Fruit Extract

Coccoloba uvifera fruit extract

4.0

A gentle, antioxidant-rich fruit extract that helps protect skin from environmental stress and may calm irritation.

Irritation

low

Source

natural

beautyskincareantioxidant
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Antioxidant

Sea Hare Ferment Filtrate

Bacillus/Kuroda's Sea Hare Extract Ferment Filtrate

3.8

A novel fermented marine ingredient with antioxidant potential, but human studies are scarce and it's best used as a supporting rather than star ingredient.

Irritation

low

Source

biotech

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Antioxidant

Sea Holly Callus Culture Filtrate

ERYNGIUM MARITIMUM CALLUS CULTURE FILTRATE

4.0

A lab-grown sea holly extract that may help calm skin and fight environmental stress, but human studies are limited.

Irritation

low

Source

biotech

beautyskincareantioxidant
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Antioxidant

Sea Holly Callus Extract

ERYNGIUM MARITIMUM CALLUS CULTURE EXTRACT

4.0

A gentle, plant-based antioxidant that may help protect skin from environmental stress and support a calm complexion.

Irritation

low

Source

biotech

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Antioxidant

Sea Kale Extract

Crambe Maritima Extract

3.8

Sea kale extract is a gentle, antioxidant-rich botanical that may help soothe skin and protect against environmental stress, but research is still emerging.

Irritation

low

Source

natural

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Antioxidant

Sea Kale Leaf Extract

Crambe Maritima Leaf Extract

3.8

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

Irritation

low

Source

natural

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Antioxidant

Sea Lavender Extract

Limonium Narbonense Flower/Leaf/Stem Extract

3.8

Sea lavender extract is a gentle botanical antioxidant that may help calm skin and fight environmental stress, but research is still limited.

Irritation

low

Source

natural

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Humectant

Sea Lettuce Extract

Ulva Linza Extract

4.0

A gentle seaweed extract that helps hydrate and calm the skin, but research on its specific benefits is still limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Antioxidant

Sea Lotus Extract

LOTUS MARITIMUS FLOWER/LEAF EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincarebotanical extract
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Soothing agent

Sea Mayweed Extract

Tripleurospermum maritimum extract

4.0

A gentle, chamomile-relative extract that may help calm irritated skin and provide antioxidant protection, though research is still emerging.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing agent

Sea Mayweed Powder

Matricaria Maritima Powder

3.8

A gentle, plant-based powder that may help calm irritated skin and provide antioxidant protection, though research is limited.

Irritation

low

Source

natural

beautyskincarebotanical
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Skin conditioning agent

Sea Raven Polypeptide-1

SR-SEA RAVEN POLYPEPTIDE-1

3.8

A novel peptide that may help support skin firmness, but research is still early and benefits are not yet proven in large human studies.

Irritation

low

Source

biotech

beautyskincareanti-aging
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Antioxidant

Sea Rocket Extract

Cakile Maritima Extract

3.8

A gentle, plant-derived extract with antioxidant and soothing potential, though research is still early.

Irritation

low

Source

natural

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Exfoliant

Sea Salt

MARIS SAL (SEA SALT)

3.8

Sea salt can be a gentle physical exfoliant and mineral source, but it may be drying or irritating for sensitive or dehydrated skin.

Irritation

moderate

Source

natural

beautyskincareexfoliant
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Humectant

Sea Salt Ferment

SACCHAROMYCES/SEA SALT FERMENT

4.0

A gentle fermented ingredient that helps hydrate and strengthen the skin barrier, ideal for sensitive and dry skin types.

Irritation

low

Source

biotech

beautyskincarehumectant
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Soothing Agent

Sea Salt Ferment Extract

Pichia/Sea Salt Ferment Lysate Extract

4.0

A gentle, fermented ingredient that may help calm and condition skin, but research is still early.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Exfoliant

Sea Silt

Sea Silt

3.8

Sea silt is a gentle, mineral-rich exfoliant that can help polish skin and absorb excess oil without harshness.

Irritation

low

Source

natural

beautyskincareexfoliantmineral
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Soothing Agent

Sea Silt Extract

Maris Limus Extract

4.0

A gentle, mineral-packed marine extract that helps calm and nourish the skin without clogging pores.

Irritation

low

Source

natural

beautyskincaresoothing
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Humectant

Sea Silt Ferment

SACCHAROMYCES/SEA SILT FERMENT

4.0

A gentle fermented ingredient that may help hydrate and support the skin barrier, but research is still limited.

Irritation

low

Source

biotech

beautyskincarehumectantconditioning agent
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Antioxidant

Sea Thrift Extract

ARMERIA MARITIMA FLOWER/LEAF/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

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Humectant

Sea Water

SEA WATER

3.8

Sea water provides a mineral-rich boost of hydration and can help soothe the skin, but it's not a miracle ingredient and may not suit very dry or sensitive skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Soothing agent

Sea Whip Extract

Pseudopterogorgia elisabethae extract

3.8

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

Irritation

low

Source

natural

beautyskincaresoothing agent
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Soothing Agent

Sea Wormwood Oil

Artemisia Maritima Herb Oil

3.5

Sea Wormwood Oil offers soothing and antimicrobial benefits but can be irritating for sensitive skin due to its essential oil content.

Irritation

moderate

Source

natural

beautyskincaresoothing
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Soothing Agent

Sea Wrack Extract

ZOSTERA MARINA EXTRACT

4.0

A gentle marine extract that helps calm irritation and protect skin from environmental stress, ideal for sensitive or reactive skin types.

Irritation

low

Source

natural

beautyskincaresoothing agent
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Conditioning agent

Seahorse Extract

Hippocampus spp. Extract

2.5

Seahorse extract is a traditional marine ingredient with limited modern research for cosmetic use; its benefits are largely anecdotal and sustainability concerns are significant.

Irritation

low

Source

natural

beautyskincaremarine extract
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Emollient

Seal Oil

Phoca vitulina oil

3.5

Seal oil is a moisturizing marine oil with omega-3s, but its use raises ethical and sustainability concerns, and it may clog pores for some.

Irritation

low

Source

natural

beautyskincareemollient
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Soothing Agent

Seaweed Callus Extract

ZOSTERA MARINA CALLUS EXTRACT

4.0

A gentle, lab-grown seaweed extract that may help calm irritation and defend against environmental stress, though human research is still limited.

Irritation

low

Source

biotech

beautyskincaresoothing agent
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Humectant

Seaweed Complex Extract

Eucheuma Serra/Saccharina Angustata/Ulva Linza Extract

4.0

A gentle seaweed blend that helps hydrate and calm the skin, suitable for most skin types.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Seaweed Extract

Undaria Pinnatifida Leaf/Stem Extract

4.0

A gentle, hydrating seaweed extract that helps soothe and protect the skin, making it a great choice for sensitive or dry skin types.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Seaweed Extract Blend

ASCOPHYLLUM NODOSUM/FUCUS VESICULOSUS/LAMINARIA CLOUSTONI/LAMINARIA DIGITATA EXTRACT

4.0

A gentle, nutrient-packed seaweed blend that hydrates and soothes skin with antioxidant benefits.

Irritation

low

Source

natural

beautyskincarehumectantsoothing
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Humectant

Seaweed Extract Complex

ASCOPHYLLUM NODOSUM/FUCUS VESICULOSUS/HIZIKIA FUSIFORME/KJELLMANIELLA GYRATA/LESSONIA NIGRESCENS/SACCHARINA ANGUSTATA/SACCHARINA JAPONICA/UNDARIA PINNATIFIDA EXTRACT

4.0

A nourishing seaweed blend that hydrates, soothes, and protects skin with antioxidants, but its complex sourcing may vary in potency.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Seaweed Ferment Complex

Saccharina angustata/Undaria pinnatifida extract

4.0

A gentle seaweed blend that hydrates and provides antioxidant protection, ideal for most skin types.

Irritation

low

Source

natural

beautyskincareantioxidant
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Humectant

Seaweed Thallus Extract

Chondrus Elatus/Saccharina Angustata/Monostroma Nitidum Thallus Extract

4.0

A gentle seaweed blend that helps hydrate and calm the skin, but research on this specific mix is limited.

Irritation

low

Source

natural

beautyskincarehumectant
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Humectant

Seaweed Yeast Ferment

SACCHAROMYCES/LAMINARIA SACCHARINA FERMENT

4.0

A fermented seaweed-yeast complex that helps hydrate and soothe skin while supporting a healthy barrier.

Irritation

low

Source

biotech

beautyskincarehumectantsoothing
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pH Adjuster

Sebacic Acid

Sebacic Acid

4.0

Sebacic acid is a gentle, plant-derived ingredient that helps balance product pH and offers mild exfoliation without significant irritation.

Irritation

low

Source

natural

beautyskincarepH adjuster
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