A synthetic hair dye colorant that is generally safe when used as directed, but may cause irritation for sensitive individuals.
Irritation
moderate
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 hair dye colorant that is generally safe when used as directed, but may cause irritation for sensitive individuals.
Irritation
moderate
Source
synthetic
5-Hexen-2-One is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
5-Melozol is a synthetic peptide that may help firm and smooth skin, but research is limited and it is not widely studied in peer-reviewed human trials.
Irritation
low
Source
synthetic
5-Melozol Acetate is a synthetic compound that may help improve skin firmness and reduce fine lines, but research is still emerging and it is not as widely studied as more established anti-aging ingredients.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a fruity note but offers no skincare benefit and may be a concern for fragrance-sensitive individuals.
Irritation
low
Source
synthetic
A synthetic floral scent that can cause skin reactions in sensitive individuals, but is generally safe at low levels.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a floral note but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a caramel-like aroma but offers no skincare benefits and may trigger sensitivity in some individuals.
Irritation
low
Source
synthetic
5-Nonen-2-One is a synthetic fragrance ingredient with limited safety data; it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance compound that adds scent but offers no skincare benefits and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic preservative helper that boosts formula stability but offers no direct skin benefit.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A strong synthetic preservative that effectively fights microbes but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic dye intermediate used in permanent hair color; it can cause skin irritation in sensitive individuals and requires careful formulation to minimize risks.
Irritation
moderate
Source
synthetic
A lab-made antioxidant with early promise for evening skin tone, but human studies are still scarce.
Irritation
low
Source
synthetic
A synthetic fragrance that adds a sweet scent but may cause skin sensitivity in some people.
Irritation
moderate
Source
synthetic
6-Methylquinoline is a synthetic fragrance ingredient that adds a warm, woody scent to products, but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefits; may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a pleasant floral note but offers no skincare benefit.
Irritation
low
Source
synthetic
A skin-friendly cholesterol derivative that helps reinforce the skin barrier and acts as a building block for vitamin D3 when exposed to UV light.
Irritation
low
Source
semi-synthetic
A gentle, oil-soluble derivative of provitamin D3 that may help support skin barrier function, though human evidence is still limited.
Irritation
low
Source
semi-synthetic
A woody fragrance ingredient that is generally safe at low concentrations but offers no skincare benefit beyond scent.
Irritation
low
Source
semi-synthetic
A synthetic fragrance ingredient that adds a fresh scent but offers no skincare benefits and may irritate sensitive skin.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefit; may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
9-Decenal is a synthetic fragrance ingredient that adds a fresh, citrusy note to products but offers no direct skincare benefit.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a fresh, fruity scent but offers no skincare benefits and may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ester that adds a pleasant scent to products; generally safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A natural exfoliant from abalone shells that gently polishes skin but has limited research and may be too abrasive for sensitive skin.
Irritation
moderate
Source
natural
A gentle plant extract with antioxidant and soothing potential, but research is still early and benefits are not yet proven in large human studies.
Irritation
low
Source
natural
Abietic acid is a pine-derived compound with promising anti-acne and anti-inflammatory benefits, but it may cause irritation or clog pores in sensitive skin.
Irritation
moderate
Source
natural
A gentle, plant-based fatty alcohol that softens skin and may help active ingredients absorb better, but it's less common and less studied than alternatives like cetyl alcohol.
Irritation
low
Source
natural
A gentle, plant-based extract with early evidence of soothing and antioxidant benefits, but more research is needed to confirm its effectiveness in skincare.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant extract that may help calm skin and fight free radicals, but research is still limited.
Irritation
low
Source
natural
A plant stem cell extract that may help protect skin from environmental stress, but research is still emerging and it's not a proven anti-aging powerhouse.
Irritation
low
Source
natural
A traditional botanical extract with potential soothing and antioxidant benefits, but safety concerns around the plant's seeds limit its use in modern cosmetics.
Irritation
moderate
Source
natural
A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still very limited.
Irritation
low
Source
natural
A gentle, natural exfoliating powder that helps remove dead skin cells and absorb excess oil, but research on its specific skincare benefits is limited.
Irritation
low
Source
natural
A gentle botanical extract with astringent and soothing potential, best for oily or combination skin types.
Irritation
low
Source
natural
A gentle botanical powder with traditional astringent benefits, but limited modern research to support strong skincare claims.
Irritation
low
Source
natural
A gentle, plant-based astringent that can help tighten pores and calm irritation, but may be drying for very sensitive skin.
Irritation
low
Source
natural
A natural gum that helps create a light, temporary film on skin, often used to improve texture or hold ingredients together.
Irritation
low
Source
natural
A gentle botanical powder that may help calm irritation and tighten pores, but research is limited and it can be drying for some skin types.
Irritation
low
Source
natural
A gentle, natural absorbent powder from tree seeds that can help mattify skin and add texture to products, but research on its skincare benefits is limited.
Irritation
low
Source
natural
A gentle botanical extract that helps tighten pores and fight free radicals, but research is mostly lab-based.
Irritation
low
Source
natural
A gentle, plant-derived cleanser and conditioner that can be a mild alternative to sulfates, especially for those with sensitive scalps or hair.
Irritation
low
Source
natural
A gentle, plant-based cleanser rich in saponins that can help clean hair and skin without stripping natural oils.
Irritation
low
Source
natural
A gentle, plant-based wax that adds richness and staying power to balms and creams without common irritation.
Irritation
low
Source
natural
A gentle, plant-based antioxidant that helps shield skin from environmental stress without irritation.
Irritation
low
Source
natural
A gentle plant extract that may help tighten pores and fight free radicals, but research on its specific skin benefits is still limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich flower extract that may help calm skin and fight free radical damage, though research is still emerging.
Irritation
low
Source
natural
A gentle, plant-derived wax that helps lock in moisture and gives a smooth, velvety feel to skincare products.
Irritation
low
Source
natural
A gentle plant extract that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
natural
Emollient
ACACIA DECURRENS/JOJOBA/SUNFLOWER SEED CERA/POLYGLYCERYL-3 ESTERS
A gentle, plant-based wax ester that helps soften skin and improve product texture without clogging pores.
Irritation
low
Source
natural
Emollient
Acacia Decurrens/Jojoba/Sunflower Seed Wax Polyglyceryl-3 Esters
A gentle, plant-based wax blend that helps create smooth, creamy textures while moisturizing the skin.
Irritation
low
Source
natural
A gentle botanical extract that may help calm skin and provide antioxidant support, though research on its cosmetic benefits is still emerging.
Irritation
low
Source
natural
A gentle, fragrant flower extract with antioxidant and soothing potential, but research on its cosmetic benefits is still limited.
Irritation
low
Source
natural
A gentle, plant-based wax that adds smoothness and structure to skincare products without clogging pores.
Irritation
low
Source
natural
A gentle natural gum that helps thicken formulas and leaves a light, non-sticky film on skin.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research is limited and benefits are not yet well-established in human skin.
Irritation
low
Source
natural