A synthetic resin that helps makeup stay put, but offers no skincare benefit and may feel heavy on sensitive skin.
Irritation
low
Source
synthetic
Beauty ingredient research
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
A synthetic resin that helps makeup stay put, but offers no skincare benefit and may feel heavy on sensitive skin.
Irritation
low
Source
synthetic
A gentle conditioning ingredient that helps skin and hair feel smooth and soft without being heavy.
Irritation
low
Source
semi-synthetic
A gentle, modified silk protein that adds softness and shine to hair and skin without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle conditioning ingredient that reduces static and improves softness without heavy buildup.
Irritation
low
Source
synthetic
Film Former
ISOSTEAROYL TRIMELLITIC ANHYDRIDE/TRIMETHYLOLPROPANE COPOLYMER
A synthetic polymer that helps makeup and sunscreen stay put, but may feel heavy or tight on some skin types.
Irritation
low
Source
synthetic
A synthetic emollient that softens skin and improves product feel, but research on its long-term effects is limited.
Irritation
low
Source
synthetic
A synthetic soothing ingredient that mimics natural skin-signaling peptides to help reduce visible redness and discomfort.
Irritation
low
Source
synthetic
A synthetic emollient that helps skin feel smooth and soft without being greasy, with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
Isostearyl Acetate is a lightweight emollient that helps skin feel soft and smooth, but it may clog pores in acne-prone individuals.
Irritation
low
Source
synthetic
A mild, amino-acid-based moisturizer that supports the skin’s natural hydration without clogging pores.
Irritation
low
Source
semi-synthetic
A gentle fatty alcohol that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
A gentle, plant-derived emollient that softens skin and helps restore the moisture barrier without clogging pores.
Irritation
low
Source
semi-synthetic
Conditioning Agent
Isostearyl Behenamidopropyl Betainate Chloride
A mild, effective conditioning ingredient that helps detangle and soften hair while being gentle enough for sensitive skin.
Irritation
low
Source
semi-synthetic
A gentle, non-greasy emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
Isostearyl Benzoate is a lightweight, non-greasy emollient that helps soften skin and improve product texture, with a low risk of irritation or clogging pores.
Irritation
low
Source
synthetic
A gentle silicone emulsifier that improves texture and stability without common silicone downsides.
Irritation
low
Source
synthetic
A mild, effective emulsifier that creates stable, silky formulas without stripping the skin — ideal for sensitive and dry skin types.
Irritation
low
Source
semi-synthetic
Surfactant
Isostearyl Dilinoleamidopropyl Betainate Chloride
A gentle, conditioning surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin and hair.
Irritation
low
Source
semi-synthetic
Isostearyl Erucate is a gentle, non-greasy emollient that helps soften skin and improve product texture, with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps skin feel smooth and soft without clogging pores.
Irritation
low
Source
synthetic
A gentle, oil-soluble antioxidant that helps protect skin from environmental stress and supports a more even-looking complexion.
Irritation
low
Source
semi-synthetic
A mild, sugar-based emulsifier that helps create stable, creamy textures without irritating the skin.
Irritation
low
Source
semi-synthetic
A gentle synthetic emollient that hydrates and smooths skin without clogging pores, suitable for most skin types.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that helps soften skin and improve product feel without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
A mild synthetic conditioner that helps rinse-off products feel softer without heavy buildup.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps soften skin and improve product texture with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
semi-synthetic
A lightweight, non-greasy emollient that softens skin without clogging pores, making it a good choice for oily or combination skin.
Irritation
low
Source
synthetic
A synthetic conditioning ingredient that reduces static and softens hair, but may cause irritation for sensitive scalps.
Irritation
moderate
Source
synthetic
A lightweight, non-greasy emollient that helps soften skin and improve product texture.
Irritation
low
Source
synthetic
A reliable emollient that makes skin feel soft, but may clog pores for those prone to breakouts.
Irritation
low
Source
synthetic
A mild, amino-acid-based surfactant that cleanses without stripping the skin's natural moisture barrier.
Irritation
low
Source
semi-synthetic
A lightweight synthetic emollient that gives skin a smooth, silky finish without clogging pores, making it a popular choice in non-greasy formulas.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that softens skin without heavy greasiness, but may clog pores for some people.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that helps soften and smooth skin while supporting the skin's natural moisture barrier.
Irritation
low
Source
semi-synthetic
Surfactant
Isostearyl Ricinoleamidopropyl Betainate Chloride
A mild, conditioning surfactant that cleanses without stripping, making it a good choice for sensitive or dry skin and hair.
Irritation
low
Source
semi-synthetic
A gentle, non-greasy emollient that improves product texture and leaves skin feeling soft without clogging pores.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that helps products spread smoothly without a greasy feel.
Irritation
low
Source
synthetic
A gentle synthetic alcohol that softens skin and helps dissolve other ingredients, but offers no active benefits on its own.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps skin feel soft and smooth without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps products glide on smoothly and leaves skin feeling soft without clogging pores.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that softens skin but may clog pores for some people.
Irritation
low
Source
synthetic
A mild synthetic emulsifier that helps products feel smooth and spread easily, with a low risk of irritation.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A synthetic emollient that softens skin but may clog pores for some people.
Irritation
low
Source
synthetic
Isovaleric acid is mainly used for its scent and to adjust product pH, but it can be irritating for sensitive skin at higher concentrations.
Irritation
moderate
Source
synthetic
Italian Cypress Extract offers antioxidant and astringent benefits, making it a gentle option for oily or combination skin, but research on its topical efficacy is still emerging.
Irritation
low
Source
natural
Itraconazole is a prescription-strength antifungal that can treat stubborn fungal skin infections, but it is not a routine cosmetic ingredient and should only be used under medical guidance.
Irritation
moderate
Source
synthetic
A gentle, biodegradable natural exfoliant that polishes skin without microplastics, but may feel too coarse for very sensitive skin.
Irritation
low
Source
natural
A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
A gentle antioxidant extract from ivy gourd seeds that may help protect skin from environmental stress, though research is still early.
Irritation
low
Source
natural
A lab-grown plant cell extract that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
biotech
A mild botanical water that may help calm skin and tighten pores, but research is limited and it's not a powerhouse ingredient.
Irritation
low
Source
natural
A botanical extract with traditional use for soothing and firming, but limited modern research and a moderate risk of skin irritation for sensitive types.
Irritation
moderate
Source
natural