A synthetic pH adjuster that helps maintain product stability, but with limited independent safety data.
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 pH adjuster that helps maintain product stability, but with limited independent safety data.
Irritation
low
Source
synthetic
A synthetic ingredient that helps preserve formulas and improve feel, but it's not a primary preservative and has limited research on long-term skin effects.
Irritation
low
Source
synthetic
Dimethyl Isopropanolamine is a synthetic pH adjuster that helps keep products stable and gentle, but it can be irritating for sensitive skin at higher concentrations.
Irritation
moderate
Source
synthetic
A gentle, non-drying solvent that helps other ingredients work better without leaving a greasy feel.
Irritation
low
Source
semi-synthetic
A synthetic foam booster that improves lather and thickness in cleansers, but may cause irritation for sensitive skin.
Irritation
moderate
Source
synthetic
Dimethyl Lauramine is a synthetic emulsifier and pH adjuster that helps blend oil and water in rinse-off cleansers, but it may cause mild irritation for sensitive skin.
Irritation
moderate
Source
synthetic
A synthetic ingredient that makes hair and skin feel smooth, but may be too heavy for oily or acne-prone skin.
Irritation
low
Source
synthetic
A gentle synthetic conditioning agent that helps soften hair and skin without heavy buildup.
Irritation
low
Source
synthetic
A synthetic emulsifier that helps mix oil and water, but may be slightly drying for sensitive skin.
Irritation
moderate
Source
synthetic
A silky, skin-friendly powder that improves product feel without clogging pores.
Irritation
low
Source
semi-synthetic
Dimethyl Maleate is a synthetic fragrance ingredient with limited skincare benefits; it may cause irritation in sensitive individuals and is best avoided in leave-on products for reactive skin.
Irritation
moderate
Source
synthetic
Dimethyl Malonate is a synthetic solvent and fragrance ingredient with minimal research on skin benefits; it's generally safe at low levels but offers no active skincare value.
Irritation
low
Source
synthetic
Dimethyl MEA can temporarily tighten and firm skin, but results are short-lived and may cause irritation for sensitive skin.
Irritation
moderate
Source
synthetic
A synthetic ester that helps other ingredients dissolve and spread smoothly, but offers little direct skin benefit.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a fresh note but may cause irritation for sensitive skin.
Irritation
moderate
Source
synthetic
An effective emulsifier and surfactant for rinse-off products, but may cause mild irritation for sensitive skin.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a fresh, citrusy note but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle, synthetic humectant that helps hydrate skin without the stickiness of glycerin, but research on its long-term benefits is still limited.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a fresh, citrusy note but offers no skincare benefit and may be a concern for those sensitive to fragrance.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic stabilizer that helps keep formulas consistent but may cause irritation in sensitive skin at higher levels.
Irritation
moderate
Source
synthetic
Dimethyl oxalate is a synthetic ester used mainly as a fragrance ingredient; it has limited direct skincare benefits and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic silicone that helps products spread smoothly and leaves a soft, non-greasy finish, but has limited published research on its long-term effects.
Irritation
low
Source
synthetic
A synthetic UV filter and conditioner with moderate safety concerns; less common in modern formulations due to potential irritation and environmental persistence.
Irritation
moderate
Source
synthetic
A synthetic conditioning agent that helps soften hair and stabilize formulas, but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ester that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations.
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 synthetic fragrance ingredient that adds a floral, rosy scent; generally considered safe at low concentrations but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic
A synthetic floral scent ingredient that is generally considered safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A plant-derived emulsifier that helps blend oils and water, but may cause irritation or clog pores in sensitive individuals.
Irritation
moderate
Source
natural
An effective emulsifier and hair conditioner, but may cause irritation or clog pores in sensitive individuals.
Irritation
moderate
Source
synthetic
A mild synthetic ester that helps other ingredients absorb and leaves skin feeling smooth, but offers no direct active benefits.
Irritation
low
Source
synthetic
Dimethyl sulfide is a sulfur compound used mainly as a solvent or to mask odors in cosmetics; it has limited research on direct skin benefits and may cause irritation at higher concentrations.
Irritation
moderate
Source
natural
A gentle sulfur compound that may help calm redness and support collagen production, but more human studies are needed to confirm its topical benefits.
Irritation
low
Source
natural
An old-school emulsifier from animal fat that can be effective but may cause irritation and is rarely used in modern clean beauty.
Irritation
moderate
Source
natural
A synthetic scent ingredient that adds a pleasant fragrance but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a fresh scent but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent ingredient that adds a pleasant aroma but offers no skin benefit; generally safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits; generally safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a fresh scent but offers no skin benefit and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance compound that adds a fruity note to products, but offers no skincare benefit and may be a concern for those with fragrance sensitivity.
Irritation
low
Source
synthetic
A synthetic film-former that helps products spread smoothly and feel lightweight, but its safety data is limited to general polymer use.
Irritation
low
Source
synthetic
Film Former
DIMETHYLACRYLAMIDE/LAURYL METHACRYLATE COPOLYMER
A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.
Irritation
low
Source
synthetic
Viscosity Controlling
Dimethylacrylamide/Sodium Acryloyldimethyltaurate Crosspolymer
A safe, effective thickener that gives gels and creams a smooth, non-sticky feel without clogging pores.
Irritation
low
Source
synthetic
Film Former
DIMETHYLAMINE/ETHYLENEDIAMINE/EPICHLOROHYDRIN COPOLYMER
A synthetic polymer that helps hair feel smooth and products spread evenly, but it's not a standout ingredient and may cause buildup with frequent use.
Irritation
low
Source
synthetic
A synthetic pH adjuster that helps keep formulas stable and gentle, but can be irritating in high concentrations.
Irritation
moderate
Source
synthetic
Film Former
DIMETHYLAMINOBENZAMIDOPROPYL/METHYL POLYSILSESQUIOXANE
A silicone polymer that helps makeup and sunscreen stay put without feeling heavy, but it may not suit those who prefer silicone-free routines.
Irritation
low
Source
synthetic
DMAE tartrate can give a temporary firming sensation, but results are short-lived and may cause irritation for some.
Irritation
moderate
Source
semi-synthetic
A gentle conditioning ingredient that helps soften hair and skin without heavy buildup.
Irritation
low
Source
synthetic
A gentle, rice-derived conditioning ingredient that helps detangle hair and soften skin without heavy buildup.
Irritation
low
Source
semi-synthetic
A synthetic film former that helps hold hairstyles and improve product wear, but offers no skin benefit beyond texture.
Irritation
low
Source
synthetic
A gentle silicone that adds slip and shine to hair and a smooth feel to skin without heavy buildup.
Irritation
low
Source
synthetic
Dimethylaminopropylamine is a synthetic pH adjuster and intermediate, but it can be a skin sensitizer and is rarely used as a standalone ingredient in leave-on skincare.
Irritation
moderate
Source
synthetic
An experimental ingredient with potential light-activated benefits, but lacks sufficient safety and efficacy data for routine cosmetic use.
Irritation
moderate
Source
semi-synthetic
Colorant
Dimethylaminostyryl Heptyl Methyl Thiazolium Iodide
A synthetic blue dye used for color in cosmetics, with limited safety data and potential for skin irritation.
Irritation
moderate
Source
synthetic
A synthetic floral scent ingredient that adds a pleasant rose note but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A common synthetic fragrance ingredient that adds a pleasant scent but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds a floral, fruity scent but offers no skincare benefits and may cause sensitivity in some individuals.
Irritation
low
Source
synthetic