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

Film Former

Hema Trimellitate Anhydride

HEMA TRIMELLITATE ANHYDRIDE

3.0

A synthetic film-forming ingredient used in nail products; it helps coatings adhere and last, but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautynail carefilm former
Read ingredient review

Colorant

Hematin

HEMATIN

3.5

Hematin is a natural pigment from blood that can add color to cosmetics, but its skincare benefits are not well-studied and it may stain skin or fabrics.

Irritation

low

Source

natural

beautyskincarecolorant
Read ingredient review

Antioxidant

Hemistepa Lyrata Extract

Hemistepa Lyrata Extract

3.8

A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Hemlock Bark Extract

Tsuga canadensis bark extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Hemlock Leaf Extract

Tsuga canadensis leaf extract

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance

Hemlock Leaf Oil

Tsuga canadensis leaf oil

3.5

A fragrant essential oil with limited skincare research; best for those who enjoy natural, woodsy scents and have no sensitivity to essential oils.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Fragrance

Hemlock Oil

Tsuga canadensis oil

3.5

A fragrant essential oil with limited skincare research; best used in low concentrations for its scent rather than proven skin benefits.

Irritation

moderate

Source

natural

beautyskincarefragrance
Read ingredient review

Antioxidant

Hemocyanin

Hemocyanin

3.0

Hemocyanin is a novel marine-derived antioxidant with limited research in cosmetics; it may help protect skin from oxidative stress but lacks robust human studies.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Oxygenating agent

Hemoglobin

HEMOGLOBIN

3.5

Hemoglobin is a trendy ingredient that may temporarily oxygenate skin and give a subtle flush, but its long-term benefits are not well proven.

Irritation

low

Source

natural

beautyskincareactive
Read ingredient review

Antioxidant

Hemp Flower Extract

CANNABIS SATIVA FLOWER EXTRACT

3.8

A gentle, antioxidant-rich botanical extract that may help calm skin and fight free radical damage, but research is still emerging.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Hemp Leaf and Flower Extract

CANNABIS SATIVA FLOWER/LEAF/STEM EXTRACT

4.0

A gentle, antioxidant-rich botanical extract that may help calm skin and protect against environmental stress, but it is not the same as CBD or THC.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Soothing agent

Hemp Nettle Extract

GALEOPSIS TETRAHIT FLOWER/LEAF/STEM EXTRACT

3.8

Hemp nettle extract is a gentle botanical with potential soothing and antioxidant benefits, but research is limited and it's not a standout ingredient.

Irritation

low

Source

natural

beautyskincarebotanical extract
Read ingredient review

Emollient

Hemp Seed Cake Extract

CANNABIS SATIVA SEEDCAKE

3.8

A gentle, plant-based emollient that helps soften and soothe the skin without clogging pores.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Exfoliant

Hemp Seed Cake Powder

Cannabis Sativa Seedcake Powder

3.8

A gentle, natural exfoliant packed with fatty acids and antioxidants, ideal for dry or sensitive skin types.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Emollient

Hemp Seed Oil Glycereth-8 Esters

CANNABIS SATIVA SEED OIL GLYCERETH-8 ESTERS

4.0

A water-friendly version of hemp seed oil that moisturizes without greasiness, ideal for sensitive and acne-prone skin.

Irritation

low

Source

semi-synthetic

beautyskincareemollient
Read ingredient review

Exfoliant

Hemp Stem Powder

CANNABIS SATIVA STEM POWDER

3.5

A natural, biodegradable physical exfoliant from hemp stems that gently buffs away dead skin cells without harsh microplastics.

Irritation

low

Source

natural

beautyskincareexfoliant
Read ingredient review

Colorant

Henna

Lawsonia Inermis Leaf Extract

3.8

Henna is a natural colorant and conditioner, but its safety depends on purity and source—avoid products with added metallic salts or synthetic dyes.

Irritation

low

Source

natural

beautyskincarehaircare
Read ingredient review

Antioxidant

Henna Callus Culture Extract

Lawsonia Inermis Callus Culture Extract

4.0

A lab-grown henna extract that offers antioxidant benefits without the staining or irritation of traditional henna.

Irritation

low

Source

biotech

beautyskincareantioxidant
Read ingredient review

Colorant

Henna Extract

Lawsonia Inermis Flower/Fruit/Leaf Extract

3.8

Henna extract is a natural colorant and conditioner, but it can cause allergic reactions in sensitive individuals and may not be suitable for all hair types.

Irritation

low

Source

natural

beautyskincarehaircare
Read ingredient review

Emollient

Henna Wax

Lawsonia Inermis Cera

4.0

A gentle plant wax from henna that adds richness and moisture to skincare without the staining properties of henna leaf.

Irritation

low

Source

natural

beautyskincareemollient
Read ingredient review

Anti-inflammatory

Heparin

Heparin

3.5

Heparin may help reduce puffiness and support microcirculation in skincare, but its topical benefits are less established than its medical use as a blood thinner.

Irritation

low

Source

natural

beautyskincareanti-inflammatory
Read ingredient review

Antioxidant

Heptacodium Flower Extract

HEPTACODIUM MICONIOIDES FLOWER EXTRACT

3.8

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

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Antioxidant

Heptacodium Leaf Extract

HEPTACODIUM MICONIOIDES LEAF EXTRACT

3.8

A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established.

Irritation

low

Source

natural

beautyskincareantioxidant
Read ingredient review

Fragrance Ingredient

Heptadecadienyl Furan

HEPTADECADIENYL FURAN

3.0

Heptadecadienyl Furan is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Emollient

Heptadecane

N-HEPTADECANE

4.0

A lightweight, non-comedogenic emollient that gives a silky feel without clogging pores, ideal for oily and acne-prone skin types.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review

Fragrance

Heptamethyl Decahydroindenofuran

HEPTAMETHYL DECAHYDROINDENOFURAN

3.5

A synthetic scent ingredient that adds a warm, woody note; generally safe at low levels but may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance

Heptanal

HEPTANAL

3.5

Heptanal is a synthetic fragrance ingredient that adds a fresh scent but may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Heptanal Diethyl Acetal

HEPTANAL DIETHYL ACETAL

3.5

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

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Solvent

Heptane

HEPTANE

3.0

Heptane is an effective fast-evaporating solvent, but its high volatility and potential for irritation make it a cautious choice for sensitive skin.

Irritation

moderate

Source

synthetic

beautyskincaresolvent
Read ingredient review

pH Adjuster

Heptanoic Acid

Heptanoic Acid

3.5

Heptanoic acid is a mild organic acid that helps balance product pH and can support preservative systems, but it may cause slight irritation in sensitive skin at higher concentrations.

Irritation

moderate

Source

natural

beautyskincarepreservative booster
Read ingredient review

Fragrance Ingredient

Heptanol

HEPTANOL

3.5

Heptanol is a mild fatty alcohol used mainly for fragrance and a light emollient feel, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Anti-aging agent

Heptapeptide-12 Dimer

Heptapeptide-12 Dimer

4.0

A synthetic peptide that may help smooth fine lines and support skin firmness with a low risk of irritation.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-Aging Agent

Heptapeptide-15 Palmitate

HEPTAPEPTIDE-15 PALMITATE

4.0

A synthetic peptide designed to support collagen and reduce fine lines, generally well-tolerated but with limited independent research.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-17

HEPTAPEPTIDE-17

3.8

Heptapeptide-17 is a synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-28

Heptapeptide-28

4.0

Heptapeptide-28 is a synthetic peptide that may help reduce fine lines and improve skin firmness, with low irritation risk and moderate research support.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-31

Heptapeptide-31

3.8

Heptapeptide-31 is a synthetic peptide that may help support skin firmness and reduce fine lines, but research is still emerging and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-32

HEPTAPEPTIDE-32

4.0

Heptapeptide-32 is a synthetic peptide that may help reduce fine lines and improve skin firmness by signaling collagen production, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-34

Heptapeptide-34

3.8

Heptapeptide-34 is a lab-made peptide that may help support skin structure, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-35

Heptapeptide-35

4.0

Heptapeptide-35 is a synthetic peptide that may help reduce the appearance of fine lines by signaling skin to support collagen, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-36

Heptapeptide-36

3.8

Heptapeptide-36 is a lab-made peptide that may help support skin firmness and reduce the appearance of fine lines, but research is still early.

Irritation

low

Source

synthetic

beautyskincareactive ingredient
Read ingredient review

Anti-aging agent

Heptapeptide-36 Dimer

Heptapeptide-36 Dimer

4.0

A synthetic peptide that may help firm skin and soften wrinkles, but research is still early.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-37

HEPTAPEPTIDE-37

3.8

Heptapeptide-37 is a synthetic peptide that may help support skin firmness and reduce fine lines, but research is still limited compared to more established peptides.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-37 Dimer

Heptapeptide-37 Dimer

4.0

A synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-38

Heptapeptide-38

4.0

Heptapeptide-38 is a synthetic peptide that may help improve skin firmness and reduce the appearance of fine lines, with low irritation risk.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Heptapeptide-38 Dimer

Heptapeptide-38 Dimer

4.0

A synthetic peptide that may help improve skin firmness and smooth fine lines, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-39

HEPTAPEPTIDE-39

4.2

A synthetic peptide that signals skin to produce more collagen, helping to soften wrinkles and improve firmness over time.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-39 Dimer

HEPTAPEPTIDE-39 DIMER

3.8

A synthetic peptide that may help firm skin and soften lines, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-40 Dimer

Heptapeptide-40 Dimer

4.0

A synthetic peptide that may help improve skin firmness and reduce fine lines, but more human studies are needed.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-41

Heptapeptide-41

4.0

Heptapeptide-41 is a promising synthetic peptide that may help firm skin and soften wrinkles, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-42

Heptapeptide-42

4.0

A synthetic peptide that may help reduce fine lines and improve skin firmness, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-7

Heptapeptide-7

4.0

Heptapeptide-7 is a synthetic peptide that signals skin to produce more collagen, helping soften fine lines over time with minimal irritation.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-8

Heptapeptide-8

4.0

A synthetic peptide that signals skin to produce more collagen, helping soften fine lines over time.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Anti-aging agent

Heptapeptide-9

Heptapeptide-9

4.0

Heptapeptide-9 is a synthetic peptide that may help firm skin and soften fine lines by signaling collagen production, with low irritation risk.

Irritation

low

Source

synthetic

beautyskincareanti-aging
Read ingredient review

Fragrance Ingredient

Heptyl Acetate

HEPTYL ACETATE

3.5

Heptyl Acetate is a synthetic fragrance ingredient that adds a fruity, floral scent but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Heptyl Butyrate

Heptyl Butyrate

3.5

Heptyl Butyrate is a synthetic fragrance ester that adds a fruity, floral scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Fragrance Ingredient

Heptyl Formate

Heptyl Formate

3.5

Heptyl Formate is a synthetic fragrance ingredient that adds a fruity, floral scent to products, but it offers no skincare benefits and may cause sensitivity in some individuals.

Irritation

low

Source

synthetic

beautyskincarefragrance
Read ingredient review

Surfactant

Heptyl Glucoside

Heptyl Glucoside

4.5

A gentle, biodegradable surfactant that effectively cleanses without stripping the skin's natural moisture barrier.

Irritation

low

Source

natural

beautyskincaresurfactant
Read ingredient review

Film Former

Heptyl Methacrylate

HEPTYL METHACRYLATE

3.0

Heptyl Methacrylate is a synthetic film-forming ingredient that helps create durable, glossy coatings in nail products, but it may cause skin irritation in sensitive individuals.

Irritation

moderate

Source

synthetic

beautyskincarefilm-former
Read ingredient review

Emollient

Heptyl Undecylenate

Heptyl Undecylenate

4.0

A lightweight, non-greasy emollient that softens skin and improves product feel without clogging pores.

Irritation

low

Source

synthetic

beautyskincareemollient
Read ingredient review