A synthetic fragrance ester that adds a fruity, apple-like scent; generally considered safe at low concentrations but offers no skincare benefit.
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 fragrance ester that adds a fruity, apple-like scent; generally considered safe at low concentrations but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a pleasant scent but may cause skin reactions in sensitive individuals.
Irritation
moderate
Source
synthetic
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
A synthetic film-former mainly found in nail products; generally safe for nails but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent molecule that adds a fresh, green note to products but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a fresh floral note but offers no skincare benefit and may be unnecessary for sensitive skin.
Irritation
low
Source
synthetic
A synthetic UVB filter that helps protect skin from sunburn, but its use is limited by regulatory approval in some regions.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that makes products feel silky, but may clog pores for acne-prone skin.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that softens skin but may clog pores for some people.
Irritation
low
Source
synthetic
A lightweight synthetic ester that softens skin without feeling greasy, with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A synthetic fragrance ester that adds a sweet, honey-like scent; generally considered safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Depigmenting Agent
ISOBUTYL PHENYLHYDRAZINOYL METHANESULFONAMIDE
A synthetic depigmenting ingredient with limited research; may help fade dark spots but requires caution due to potential irritation and lack of long-term safety data.
Irritation
moderate
Source
synthetic
A silicone polymer that helps makeup and skincare last longer without feeling heavy or greasy.
Irritation
low
Source
synthetic
Isobutyl Propionate is a synthetic ester used for its fruity scent in cosmetics; it is generally considered safe at low concentrations but offers no skincare benefits.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a unique scent but offers no skincare benefits; safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that softens skin and helps other ingredients spread smoothly.
Irritation
low
Source
semi-synthetic
A synthetic fragrance compound that adds a pleasant floral note but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A lightweight synthetic emollient that softens skin but may clog pores for some people.
Irritation
low
Source
synthetic
Isobutyl Tallowate is a semi-synthetic emollient that softens skin but may be comedogenic for acne-prone individuals.
Irritation
low
Source
semi-synthetic
Isobutyl Tiglate is a synthetic fragrance ingredient that adds a sweet, fruity scent to products; it is generally considered safe at low levels but offers no skincare benefits.
Irritation
low
Source
synthetic
A well-researched synthetic brightener that targets dark spots by blocking a key enzyme in melanin production, with good tolerability.
Irritation
low
Source
synthetic
A modified lanolin oil that moisturizes and smooths skin, but may clog pores for some people.
Irritation
low
Source
semi-synthetic
Film Former
ISOBUTYLENE/ETHYLMALEIMIDE/HYDROXYETHYLMALEIMIDE COPOLYMER
A synthetic polymer that helps makeup and sunscreen stay put longer, but offers no active skincare benefit.
Irritation
low
Source
synthetic
A synthetic rubber that helps products stay put and resist water, but offers no skin benefit.
Irritation
low
Source
synthetic
A safe, synthetic film-former that helps makeup and skincare stay put without clogging pores or irritating skin.
Irritation
low
Source
synthetic
A synthetic polymer that helps products stay put and resist water, generally considered safe and non-irritating.
Irritation
low
Source
synthetic
Isobutylparaben is an effective preservative but has raised safety concerns due to potential hormone-mimicking effects, leading many brands to phase it out.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a leathery note but may cause irritation for sensitive skin.
Irritation
moderate
Source
synthetic
A synthetic brightener that targets dark spots by blocking a key enzyme in melanin production, but may cause irritation for sensitive skin.
Irritation
moderate
Source
synthetic
Isobutylthiazole is a synthetic fragrance compound that adds a green, nutty, or roasted note to products; it is generally safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a sharp, fruity scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Isobutyric acid is a fragrance ingredient and pH adjuster that is generally safe at low levels but can be irritating in high concentrations.
Irritation
moderate
Source
synthetic
A gentle, synthetic emollient that helps soften and smooth skin without clogging pores.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a warm, woody scent; generally considered safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Isocarvyl acetate is a synthetic fragrance ingredient that adds a fresh, herbal scent to products; it is generally considered safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Isoceteth-10 is a gentle synthetic emulsifier that helps mix oil and water in skincare, with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
Isoceteth-10 Stearate is a gentle synthetic emulsifier that helps water and oil mix in your creams and lotions, with a low risk of irritation.
Irritation
low
Source
synthetic
Isoceteth-12 is a synthetic emulsifier that helps mix oil and water in cleansers, but it may be slightly drying or irritating for very sensitive skin.
Irritation
moderate
Source
synthetic
A reliable emulsifier that helps mix oil and water in creams and lotions, generally well-tolerated but may be less suitable for very sensitive skin.
Irritation
low
Source
synthetic
Isoceteth-20 is a gentle synthetic emulsifier that helps mix water and oil in your skincare, making textures smooth and stable without common irritation.
Irritation
low
Source
synthetic
Isoceteth-25 is a gentle synthetic emulsifier that helps mix oil and water, making it a common but low-risk ingredient in cleansers and creams.
Irritation
low
Source
synthetic
Isoceteth-30 is a mild synthetic emulsifier that helps mix water and oil in cleansers, with low irritation potential for most skin types.
Irritation
low
Source
synthetic
Isoceteth-5 is a gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, with a low risk of irritation.
Irritation
low
Source
synthetic
Isoceteth-7 is a gentle synthetic emulsifier that helps mix oil and water in your skincare products, but it may not be ideal for those avoiding ethoxylated ingredients.
Irritation
low
Source
synthetic
A reliable synthetic emulsifier that helps create stable, creamy textures in skincare, but offers no direct skin benefit.
Irritation
low
Source
synthetic
Isocetyl alcohol is a gentle, non-drying emollient that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A gentle, non-greasy emollient that helps moisturizers feel silky 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 helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that softens skin and helps products spread smoothly.
Irritation
low
Source
synthetic
Isocetyl Laurate is a lightweight, non-greasy emollient that softens skin and improves product texture with a low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps soften and smooth skin without clogging pores.
Irritation
low
Source
synthetic
Isocetyl Myristate is a reliable emollient that softens skin, but it may clog pores for some people.
Irritation
low
Source
synthetic
A lightweight synthetic emollient that softens skin without a greasy feel, but may clog pores for some people.
Irritation
low
Source
synthetic
Isocetyl Salicylate is a gentle emollient that also offers mild salicylic acid-like benefits, making it a good option for smoothing skin without irritation.
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 soften and smooth skin without clogging pores.
Irritation
low
Source
synthetic
A gentle marine-sourced extract that helps calm and protect the skin, though research is still emerging.
Irritation
low
Source
natural
Isocineole is a gentle, plant-derived compound that may help calm skin and provide a cooling sensation, but research on its cosmetic benefits is still limited.
Irritation
low
Source
natural
A synthetic film-former that helps makeup last longer and resist water, but may feel tight or stiff on some skin types.
Irritation
low
Source
synthetic