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 59 of 539
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

Skin conditioning agent

Tetrapeptide-56

Tetrapeptide-56

3.8

Tetrapeptide-56 is a lab-made peptide that may help support skin firmness and reduce fine lines, but research is still early and it's less studied than more common peptides.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-57

Tetrapeptide-57

3.8

Tetrapeptide-57 is a lab-made peptide that may help support collagen and improve skin firmness, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-58

Tetrapeptide-58

4.0

Tetrapeptide-58 is a lab-made peptide that may help improve skin firmness and smooth fine lines, but research is still limited compared to more established peptides.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Tetrapeptide-58 Dimer

Tetrapeptide-58 Dimer

4.0

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

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tetrapeptide-59

Tetrapeptide-59

4.0

Tetrapeptide-59 is a lab-made peptide that may help support collagen production and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-59 Dimer

Tetrapeptide-59 Dimer

4.0

A synthetic peptide that may help firm skin and soften fine lines, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Soothing agent

Tetrapeptide-6

Tetrapeptide-6

4.0

Tetrapeptide-6 is a gentle, lab-made peptide that may help reduce under-eye puffiness and dark circles by supporting microcirculation and soothing the skin.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-61

Tetrapeptide-61

3.8

Tetrapeptide-61 is a lab-made peptide that may help support skin firmness and reduce fine lines, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tetrapeptide-62

Tetrapeptide-62

4.0

Tetrapeptide-62 is a lab-made peptide that may help support collagen production and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-63

Tetrapeptide-63

4.0

Tetrapeptide-63 is a lab-made peptide that may help support skin structure and reduce signs of aging, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-64

Tetrapeptide-64

3.8

Tetrapeptide-64 is a lab-made peptide that may help support collagen and firmness, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tetrapeptide-65

Tetrapeptide-65

3.8

Tetrapeptide-65 is a lab-made peptide that may help support collagen and firm skin, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-67

Tetrapeptide-67

4.0

Tetrapeptide-67 is a promising synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tetrapeptide-67 Dimer

Tetrapeptide-67 Dimer

3.8

Tetrapeptide-67 Dimer is a lab-made peptide that may help support collagen and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-inflammatory

Tetrapeptide-7

Tetrapeptide-7

4.3

A gentle, research-backed peptide that calms skin inflammation and supports collagen for a smoother, more resilient complexion.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Thermotoga Maritima Peptide Complex

Thermotoga Maritima Polypeptide-1, Oligopeptide-105, Oligopeptide-106, Hexapeptide-40

4.0

A biotech peptide blend that may help support skin firmness and resilience, though human studies are limited.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Thermotoga Maritima Polypeptide-1

Thermotoga Maritima Polypeptide-1

3.8

A biotech peptide from an extremophile microbe that may help skin cope with environmental stress, but human research is still limited.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Thioctoyl Dipeptide-36 Amide

THIOCTOYL DIPEPTIDE-36 AMIDE PEG-2 ETHYLAMINE

3.8

A lab-made peptide that may help improve skin firmness and reduce the look of fine lines, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Thioctoyl Pentapeptide-4

THIOCTOYL PENTAPEPTIDE-4

4.0

A hybrid peptide-antioxidant ingredient that may help firm skin and fight oxidative stress, but human data is still limited.

Irritation

low

Source

semi-synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Thioctoyl Tetrapeptide-3

THIOCTOYL TETRAPEPTIDE-3

4.0

A synthetic peptide-lipoic acid hybrid that may help firm skin and soften lines, but human data is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Thioctoyl Tripeptide-1

THIOCTOYL TRIPEPTIDE-1

4.0

A synthetic peptide that pairs lipoic acid with a tripeptide to help firm skin and fight oxidative stress, generally well-tolerated.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Thioctoyl Tripeptide-35

Thioctoyl Tripeptide-35

3.8

A synthetic peptide that combines a lipoic acid-like antioxidant with a signaling peptide to help protect and firm skin, though human studies are limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tobacco Plant Peptide Complex

Nicotiana Benthamiana Hexapeptide-40 Sh-Polypeptide-76

3.5

A novel peptide complex from tobacco plants that may support collagen and skin firmness, but research is still early.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Soothing agent

Tranexamoyl Dipeptide-22

Tranexamoyl Dipeptide-22

4.0

A gentle peptide that may help calm redness and support skin barrier comfort, though human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Transgenic Rice Oligopeptide-2

Transgenic Rice Rh-Oligopeptide-2

3.8

A biotech peptide from transgenic rice that may support collagen and skin firmness, but human research is still limited.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Transgenic Tobacco Oligopeptide-1

TRANSGENIC TOBACCO RH-OLIGOPEPTIDE-1

3.8

A biotech peptide from tobacco that may help reduce fine lines, but research is still limited compared to traditional peptides.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-wrinkle agent

Trifluoroacetyl Tripeptide-2

TRIFLUOROACETYL TRIPEPTIDE-2

4.0

A synthetic peptide that may help soften expression lines and improve skin firmness, but human data is limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Tripeptide-10 Citrulline

Tripeptide-10 Citrulline

4.0

A lab-made peptide that helps strengthen the skin's foundation, making it a gentle but effective option for firming and anti-aging routines.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tripeptide-38

Tripeptide-38

4.3

A well-studied synthetic peptide that helps firm skin and reduce fine lines by boosting collagen production.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tripeptide-41

Tripeptide-41

4.0

Tripeptide-41 is a lab-made peptide that signals skin to produce more collagen, helping reduce fine lines and improve firmness with minimal irritation risk.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tripeptide-43

Tripeptide-43

4.0

A synthetic peptide that may help reduce fine lines and improve skin firmness by signaling collagen production.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tripeptide-44

Tripeptide-44

4.0

A lab-made peptide that signals skin to produce more collagen, helping reduce fine lines and improve firmness with minimal irritation.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Tripeptide-48

Tripeptide-48

3.8

A lab-made peptide that may help support skin firmness and reduce fine lines, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-49

Tripeptide-49

4.0

A synthetic peptide that may help support collagen and reduce fine lines, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Tripeptide-52

Tripeptide-52

4.0

A synthetic peptide that may help support collagen and improve skin firmness, but more human studies are needed.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-54

Tripeptide-54

4.0

Tripeptide-54 is a lab-made peptide that may help support collagen production and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin-conditioning agent

Tripeptide-57

Tripeptide-57

3.8

Tripeptide-57 is a lab-made peptide that may help support skin firmness and smoothness, but research is still early and results vary.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-58

Tripeptide-58

4.0

Tripeptide-58 is a lab-made peptide that may help improve skin firmness and smooth fine lines, but research is still limited compared to more established peptides.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-61

Tripeptide-61

4.0

Tripeptide-61 is a lab-made peptide that may help firm skin and soften wrinkles, but research is still emerging compared to more established peptides.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-62

Tripeptide-62

3.8

A synthetic peptide that may help support collagen and improve skin firmness, but human data is still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging

Tripeptide-63

Tripeptide-63

4.0

Tripeptide-63 is a lab-made peptide that encourages your skin to produce more collagen and elastin, helping reduce fine lines and improve firmness.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Tripeptide-64

Tripeptide-64

4.0

A synthetic peptide that may help support skin firmness and repair, but evidence is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-Aging Agent

Tripeptide-66

Tripeptide-66

4.0

Tripeptide-66 is a lab-made peptide that may help support collagen and improve skin firmness, but research is still early.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-68

Tripeptide-68

4.0

A synthetic peptide that may help support collagen and improve skin firmness, but research is still emerging.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Tripeptide-69

Tripeptide-69

3.8

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

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Trisobac

Trisobac

3.8

A gentle peptide complex that may help calm redness and strengthen the skin barrier, but research is still early.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Antioxidant

Troloxoyl Decapeptide-10

Troloxoyl Decapeptide-10

4.0

A promising synthetic peptide-antioxidant hybrid that may help protect and firm skin, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin-conditioning agent

Troloxoyl Decapeptide-18

TROLOXOYL DECAPEPTIDE-18

3.8

A synthetic peptide that may help brighten under-eye circles by combining antioxidant and peptide actions, though human studies are limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Troloxoyl Nonapeptide-38

Troloxoyl Nonapeptide-38

3.8

A lab-made peptide paired with an antioxidant that may help smooth fine lines, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Troloxoyl Oligopeptide-143

Troloxoyl Oligopeptide-143

3.8

A lab-made peptide that may help smooth wrinkles and improve skin firmness, but human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Antioxidant

Troloxoyl Oligopeptide-33

Troloxoyl Oligopeptide-33

3.8

A lab-made peptide fused with an antioxidant that may help protect skin from environmental stress and support a smoother appearance, though human studies are still limited.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin-conditioning agent

Trypanosoma Cruzi Polypeptide-1

R-TRYPANOSOMA CRUZI POLYPEPTIDE-1

2.5

A novel synthetic peptide with very limited research in cosmetics; its benefits are not well-established for everyday skincare.

Irritation

low

Source

biotech

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Ursoloyl Pentapeptide-4

Ursoloyl Pentapeptide-4

4.0

A synthetic peptide that may help firm skin and reduce fine lines by signaling collagen production.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Ursoloyl Tetrapeptide-37

Ursoloyl Tetrapeptide-37

3.8

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

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Valprooyl Oligopeptide-33

Valprooyl Oligopeptide-33

4.0

A synthetic peptide that mimics a calming signal to help soothe reactive skin and support barrier repair.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Anti-aging agent

Zinc Hexapeptide-11

Zinc Hexapeptide-11

4.0

A synthetic peptide that may help firm skin and soften fine lines, with low irritation risk but limited independent research.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review

Skin conditioning agent

Zinc Palmitoyl Nonapeptide-14

ZINC PALMITOYL NONAPEPTIDE-14

4.0

A synthetic peptide that may help improve skin firmness and reduce fine lines, with low irritation potential.

Irritation

low

Source

synthetic

beautyskincarepeptide
Read ingredient review