A synthetic antioxidant that helps keep oils and butters fresh, extending product shelf life without directly benefiting 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 antioxidant that helps keep oils and butters fresh, extending product shelf life without directly benefiting skin.
Irritation
low
Source
synthetic
A synthetic film-former that helps products resist water and sweat, but its environmental persistence raises concerns.
Irritation
low
Source
synthetic
A synthetic scent ingredient that gives a warm, woody aroma but offers no skincare benefit and may cause sensitivity in some people.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-5,5-DIMETHYLNAPHTHALENE-2-CARBALDEHYDE
A synthetic scent ingredient that adds a fresh, woody note but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-8,8-DIMETHYLNAPHTHALENE-2-CARBONITRILE
A synthetic scent ingredient that adds a fresh, woody note to products but offers no skincare benefit and may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic azulene derivative used mainly for its pleasant scent and potential soothing effects, but research on its specific benefits is limited.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-TETRAMETHYLCYCLOPROPANAPHTHALENONE
A synthetic fragrance ingredient that adds a warm, woody scent; generally safe at low levels but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody note but offers no skincare benefit and may be unnecessary for sensitive skin.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-TETRAMETHYL-METHANO-CYCLOPENTACYCLOPROPABENZENE-4-METHANOL ACETATE
A synthetic fragrance ingredient that adds a woody, amber scent; generally considered safe at low concentrations but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody aroma but offers no skincare benefits and may be unnecessary for sensitive noses.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-TRIMETHYLSPIRO-METHANOAZULENE-6,2'-OXIRANE
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
A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may be a concern for those with fragrance sensitivities.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody note to products; generally considered safe at low levels but may cause sensitivity in some people.
Irritation
low
Source
synthetic
Fragrance
OCTAHYDRO-TETRAMETHYL-METHANO-CYCLOPENTACYCLOPROPABENZENE-4-METHANOL
A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefit and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody note to products; generally safe at low levels but may cause sensitivity in some people.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRO-TRIMETHYL-ETHANO-NAPHTHOXIRENE
A synthetic fragrance compound that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a warm, woody scent but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
Fragrance Ingredient
OCTAHYDRODIMETHYL-2,5-METHANO-INDENOOXIRENE
A synthetic scent ingredient that adds a woody, amber-like note; generally safe at low levels but may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a woody, amber-like aroma; generally safe at low levels but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic
Octanal is a synthetic fragrance ingredient that adds a fresh citrus scent but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a fresh, citrus note but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a pleasant floral-citrus scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Octane is a synthetic hydrocarbon that may act as a solvent in cosmetics, but it is rarely used in leave-on skincare and has limited safety data for topical use.
Irritation
moderate
Source
synthetic
A next-generation green tea antioxidant that's more stable and penetrates skin better than plain EGCG, but research is still early.
Irritation
low
Source
semi-synthetic
A synthetic peptide that may help soften expression lines and improve skin firmness, but research is still early and results vary.
Irritation
low
Source
synthetic
A synthetic peptide that may help support skin firmness and reduce fine lines, but human research is still limited.
Irritation
low
Source
synthetic
A synthetic peptide that may help support skin firmness and reduce fine lines, but research is still early.
Irritation
low
Source
synthetic
A synthetic peptide that may help soften expression lines and improve skin firmness, but more independent human studies are needed.
Irritation
low
Source
synthetic
A synthetic peptide that may help firm skin and soften fine lines, but research is still early and results vary.
Irritation
low
Source
synthetic
A synthetic peptide that may help support collagen and reduce fine lines, but research is still early and results vary.
Irritation
low
Source
synthetic
A lab-made peptide that may help soften expression lines over time, but independent human research is still limited.
Irritation
low
Source
synthetic
A synthetic peptide that may help reduce fine lines and improve skin firmness, but research is still emerging and results vary.
Irritation
low
Source
synthetic
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
Octapeptide-35 is a lab-made peptide that may help support collagen and reduce fine lines, but human research is still limited.
Irritation
low
Source
synthetic
Octapeptide-36 is a lab-made peptide that may help reduce the look of fine lines and wrinkles, but research is still early.
Irritation
low
Source
synthetic
Octatrienoic Acid is a synthetic fatty acid with antioxidant potential, but research on its benefits in skincare is still limited.
Irritation
low
Source
synthetic
Octene is a synthetic solvent that helps products spread smoothly and dissolve oils, but it offers no direct skin benefit.
Irritation
low
Source
synthetic
A synthetic emollient that helps products glide on smoothly without heavy greasiness, but has limited research on long-term skin benefits.
Irritation
low
Source
synthetic
Octenidine HCl is a potent antimicrobial used in medical antiseptics, not a typical skincare ingredient; it may be too harsh for daily cosmetic use.
Irritation
moderate
Source
synthetic
A gentle, modified natural gum that helps stabilize formulas and leaves a smooth, non-sticky feel on skin.
Irritation
low
Source
semi-synthetic
Octinoxate is a widely used UVB filter that protects skin from sunburn, but it has raised environmental concerns and may cause skin reactions in some people.
Irritation
low
Source
synthetic
Octocrylene is a widely used sunscreen ingredient that effectively absorbs UVB rays, but it has raised some environmental and stability concerns.
Irritation
low
Source
synthetic
Octoxynol-1 is a synthetic emulsifier that helps mix oil and water, but it may cause mild irritation for sensitive skin.
Irritation
moderate
Source
synthetic
A gentle synthetic surfactant that helps cleanse the skin without causing excessive dryness or irritation.
Irritation
low
Source
synthetic
Octoxynol-33 is a synthetic emulsifier that helps mix oil and water in cleansers and shampoos, but it may cause mild irritation for sensitive skin.
Irritation
moderate
Source
synthetic
Octoxynol-70 is a synthetic emulsifier that helps cleanse but may be drying or irritating for sensitive skin.
Irritation
moderate
Source
synthetic
Octoxynol-9 is an effective emulsifier and cleanser, but its environmental persistence and potential for mild irritation make it a less preferred choice for sensitive skin or eco-conscious routines.
Irritation
moderate
Source
synthetic
A gentle synthetic surfactant that effectively cleanses without the harshness of traditional soaps, making it suitable for sensitive skin.
Irritation
low
Source
synthetic
Octrizole is a synthetic UV filter that helps protect skin from sun damage, but it's less common in the US than in Europe and Asia.
Irritation
low
Source
synthetic
Octyl Acetate is a safe, low-irritation synthetic ester used mainly as a solvent and light fragrance component in cosmetics.
Irritation
low
Source
synthetic
A solvent blend that helps dissolve other ingredients and may add a light scent, but can be drying or irritating for sensitive skin.
Irritation
moderate
Source
synthetic
A mild synthetic ester that helps condition skin and improve product feel, but research on its long-term effects is limited.
Irritation
low
Source
synthetic
Octyl Formate is a synthetic fragrance ingredient that adds a fruity scent to products; it is generally considered safe at low concentrations but offers no skincare benefits.
Irritation
low
Source
synthetic
A mild synthetic ester that helps products feel silky and spread easily, but it's mainly used for texture and scent, not active skincare benefits.
Irritation
low
Source
synthetic
A synthetic film-former that helps makeup last longer and resist water, but offers no direct skin benefit.
Irritation
low
Source
synthetic
Emulsifier
Octyl Polystyrene Oxide/PEG-10 Copolymer Phosphate
A synthetic emulsifier that helps blend water-resistant ingredients into stable formulas, generally considered safe at low concentrations.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient that helps products spread easily and leaves skin feeling soft without clogging pores.
Irritation
low
Source
synthetic
Octyldecyl Phosphate is a mild synthetic emulsifier that helps stabilize formulas and improve texture, with a low risk of irritation for most skin types.
Irritation
low
Source
synthetic