A mild cleansing agent that helps remove dirt and oil without stripping the skin, but is rarely used alone in modern formulations.
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 mild cleansing agent that helps remove dirt and oil without stripping the skin, but is rarely used alone in modern formulations.
Irritation
low
Source
synthetic
A niacinamide variant that may improve skin tone and circulation, but can cause temporary flushing in sensitive individuals.
Irritation
moderate
Source
semi-synthetic
Methyl nicotinate creates a temporary flush and warmth by widening blood vessels, but it can irritate sensitive skin and its cosmetic benefits are short-lived.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient with a strong, fruity odor; generally safe at low levels but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic
A synthetic fragrance ester that adds a fruity, floral note to products; generally safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Methyl O-Anisate is a synthetic fragrance ingredient with a pleasant anise-like scent, generally considered safe at low concentrations but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic
A gentle emollient derived from fatty acids that helps soften and smooth skin, but research on its specific benefits is still limited.
Irritation
low
Source
semi-synthetic
Fragrance Ingredient
METHYL-OCTAHYDRO-DIMETHYLAZULENYLETHYL ACETATE
A synthetic scent ingredient that adds a warm, woody note to products but offers no skincare benefit and may trigger sensitivities in some people.
Irritation
low
Source
synthetic
Methyl Oleate is a gentle emollient that softens skin but may clog pores for acne-prone individuals.
Irritation
low
Source
semi-synthetic
A synthetic scent ingredient that adds a pleasant woody note but offers no skincare benefit and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a pleasant, subtle note to products but offers no skincare benefits.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds scent but offers no skincare benefit and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle, plant-derived fragrance ingredient that adds a sweet, anise-like scent to products with minimal irritation risk.
Irritation
low
Source
natural
Methyl Palmate is a gentle, plant-derived emollient that softens skin and helps other ingredients spread smoothly, but its palm oil origin raises sustainability concerns.
Irritation
low
Source
natural
Methyl Palmitate is a gentle emollient that softens skin, but may clog pores for acne-prone individuals.
Irritation
low
Source
semi-synthetic
Methyl Pelargonate is a mild synthetic ester that adds a subtle fruity scent and light emollient feel, but it offers no active skincare benefits.
Irritation
low
Source
synthetic
A functional solvent that helps products spread and feel lighter, but may cause irritation in sensitive individuals at high concentrations.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds a sweet, fruity scent but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A fast-drying, non-greasy fluid that helps products spread smoothly and feel lightweight on skin.
Irritation
low
Source
synthetic
A fast-evaporating synthetic fluid that helps products spread smoothly and feel weightless, but its environmental persistence raises concerns.
Irritation
low
Source
synthetic
Methyl phenethyl ether is a synthetic fragrance ingredient that adds a floral, honey-like scent to products; it is generally considered safe at low levels but offers no skincare benefits.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds pleasant scent but offers no skincare benefits; safe at low levels but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
A synthetic fragrance compound that adds a pleasant floral-green note but offers no skincare benefit and may be unnecessary for sensitive skin.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefit; generally safe at low levels but may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic UV filter that helps protect skin from sun damage, but is less common than newer alternatives.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a sweet, balsamic scent; generally safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Methyl propionate is a synthetic fragrance ingredient that adds a fruity, rum-like scent to products; it is generally considered safe at low levels but offers no skincare benefits.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, woody note to products but offers no skincare benefit and may be unnecessary for sensitive skin.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds a buttery or caramel-like scent, but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic scent compound that adds a nutty, roasted aroma to products but offers no skincare benefit beyond fragrance.
Irritation
low
Source
synthetic
Methyl pyrrolidone is a powerful solvent that can help ingredients absorb deeper, but its potential for irritation and safety concerns make it a less preferred choice in modern skincare.
Irritation
moderate
Source
synthetic
A gentle, castor-oil-derived emollient that softens skin without feeling greasy, but it's not a powerhouse active ingredient.
Irritation
low
Source
natural
A plant-based film former that helps makeup and skincare stay put, especially in water-resistant formulas.
Irritation
low
Source
natural
Methyl salicylate can soothe minor muscle aches and provide a cooling-warming sensation, but it may irritate sensitive skin and should be used cautiously around the face.
Irritation
moderate
Source
natural
A gentle, dual-action ingredient that combines cooling and soothing benefits, best for calming irritated or sensitive skin.
Irritation
low
Source
semi-synthetic
A gentle emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
semi-synthetic
A gentle emollient that helps soften and smooth skin without clogging pores, but it's not a standout active ingredient.
Irritation
low
Source
synthetic
A lightweight, non-greasy emollient derived from sunflower oil that hydrates and softens skin with a silky finish.
Irritation
low
Source
natural
A synthetic humectant that pulls moisture into the skin, but research on its long-term effects is still emerging.
Irritation
low
Source
synthetic
Methyl Tiglate is a synthetic fragrance ingredient that adds a pleasant scent to products but offers no skincare benefits and may trigger sensitivities in some people.
Irritation
low
Source
synthetic
Methyl Travoprost is a synthetic prostaglandin analog that can promote eyelash growth, but it carries risks of irritation and potential side effects, including darkening of the eyelid skin and iris color changes.
Irritation
moderate
Source
synthetic
A gentle, non-greasy silicone that improves product feel and spreadability without clogging pores.
Irritation
low
Source
synthetic
Fragrance Ingredient
METHYL METHYL-TRIMETHYLCYCLOHEXENYL-VINYLOXIRANE-2-CARBOXYLATE
A synthetic fragrance ingredient that adds scent but offers no skincare benefit; generally safe at low levels but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic
A synthetic UVA filter that helps protect skin from deeper sun damage, but its use is limited outside certain regions.
Irritation
low
Source
synthetic
A gentle, lab-made amino acid derivative that may help protect skin from environmental stress, but research is still early.
Irritation
low
Source
synthetic
A gentle, synthetic amino acid derivative that may help brighten skin by interfering with melanin production, but clinical evidence is still limited.
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 emollient ester that softens skin without a greasy feel, generally well-tolerated.
Irritation
low
Source
synthetic
A synthetic peptide that may help soften expression lines and improve skin firmness with low irritation risk.
Irritation
low
Source
synthetic
Methyl Valerate is a synthetic fragrance ester that adds a fruity note to products; it is generally safe at low levels but offers no skincare benefit.
Irritation
low
Source
synthetic
Methyl Vanillate is a gentle antioxidant that helps protect skin from environmental stress while offering a subtle vanilla-like scent.
Irritation
low
Source
natural
A synthetic scent ingredient that adds a fresh, minty note but offers no skincare benefits and may cause sensitivity in some people.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefits and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds a pleasant scent but offers no skincare benefits and may cause irritation for sensitive individuals.
Irritation
moderate
Source
synthetic
Fragrance Ingredient
METHYL-METHYLOXOCYCLOHEXYLETHYL ETHANETHIOATE
A synthetic fragrance ingredient that adds scent but offers no skincare benefits; safe at low levels but unnecessary for most routines.
Irritation
low
Source
synthetic
Fragrance Ingredient
METHYL-METHYLPENTENYLCYCLOHEXENE-1-CARBALDEHYDE
A synthetic fragrance ingredient that adds a pleasant floral-citrus scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance compound that adds scent but offers no skincare benefit and may irritate sensitive skin.
Irritation
moderate
Source
synthetic
Skin conditioning agent
METHYLACETYL METHYLPROPANOYL ETHYLCARBAMATE
A synthetic skin-conditioning agent with limited research; generally considered safe at low concentrations but not widely studied.
Irritation
low
Source
synthetic
Methylal is an effective solvent that helps products spread and dry quickly, but it may cause irritation in sensitive skin and raises mild concerns about formaldehyde release.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefits; safe at low levels but may cause irritation in sensitive individuals.
Irritation
low
Source
synthetic