A gentle, plant-based emollient that helps reinforce the skin’s moisture barrier without clogging pores.
Irritation
low
Source
semi-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 gentle, plant-based emollient that helps reinforce the skin’s moisture barrier without clogging pores.
Irritation
low
Source
semi-synthetic
Stillingia Root Extract is a gentle botanical with traditional soothing and antimicrobial uses, but modern cosmetic research is limited.
Irritation
low
Source
natural
Stinging Nettle Extract is a gentle botanical that may help calm skin and provide antioxidant protection, but its benefits are modest and not as well-studied as some other plant extracts.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant juice that can help calm irritated skin and provide light hydration.
Irritation
low
Source
natural
A gentle botanical powder that may help calm irritation and provide antioxidant protection, but its benefits in skincare are not yet strongly backed by clinical studies.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but limited human studies on its skincare benefits.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant that may help calm skin and fight free radical damage, though research is still early.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is limited and it may not be a standout ingredient.
Irritation
low
Source
natural
A gentle plant extract that may help calm skin and fight free radical damage, but research is still limited.
Irritation
low
Source
natural
A gentle botanical water that may help calm skin and provide antioxidant support, though research is limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
natural
A gentle, antioxidant-rich ingredient from strawberry stem cells that may help protect skin from environmental stress, though human studies are limited.
Irritation
low
Source
biotech
A gentle, antioxidant-rich botanical extract from strawberry tops that may help calm skin and fight free radical damage, though research is still early.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is limited and benefits are not yet well-established in human studies.
Irritation
low
Source
natural
A mild, plant-based antioxidant extract that may help calm skin and fight free radicals, though research is still early.
Irritation
low
Source
natural
A gentle, antioxidant-rich fruit extract that may help brighten and soothe skin, but benefits are mostly from whole-fruit properties rather than a single active.
Irritation
low
Source
natural
A gentle, antioxidant-rich fruit juice that adds a touch of nourishment and a pleasant natural scent to skincare formulas.
Irritation
low
Source
natural
Strawberry fruit powder offers gentle physical exfoliation and antioxidant benefits, but its effectiveness depends on particle size and formulation.
Irritation
low
Source
natural
A gentle plant extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
Strawberry seed extract is a gentle, antioxidant-rich ingredient that helps protect skin from environmental stress and supports a healthy-looking complexion.
Irritation
low
Source
natural
A gentle, antioxidant-rich oil that hydrates without clogging pores, but research on its specific benefits is still limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant extract from strawberry runners that may help soothe and protect skin, though research is still early.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help calm skin and defend against environmental stress, though research is still emerging.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant that helps protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
biotech
A gentle botanical extract that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
Skin conditioning
STREPTOCOCCUS SALIVARIUS/HYDROLYZED NONFAT DRY MILK FERMENT
A probiotic ferment that may help balance the skin microbiome and strengthen the skin barrier, though research is still early.
Irritation
low
Source
biotech
Soothing agent
STREPTOCOCCUS THERMOPHILUS/MILK FERMENT LYSATE
A gentle probiotic ingredient that may help calm irritation and support a balanced skin microbiome.
Irritation
low
Source
biotech
Skin conditioning agent
STREPTOMYCES AVERMITILIS/SOYBEAN EXTRACT FERMENT FILTRATE
A gentle, biotech-derived ferment that may help calm and condition the skin, though research is still emerging.
Irritation
low
Source
biotech
A biotech ferment extract with early research suggesting soothing benefits, but human studies are limited.
Irritation
low
Source
biotech
A gentle, biotech-derived ingredient that may help calm and support the skin barrier, but research is still emerging.
Irritation
low
Source
biotech
A gentle, biotech-derived ferment that may help calm irritation and support a balanced skin microbiome, though human research is still limited.
Irritation
low
Source
biotech
A gentle, biotech-derived ingredient that may help hydrate and support the skin barrier, but research is still early.
Irritation
low
Source
biotech
A bacterial extract with promising anti-inflammatory potential, but research is still early and mostly lab-based.
Irritation
low
Source
biotech
Strontium acetate can help calm reactive skin by temporarily blocking nerve signals that cause stinging or burning, but it is not a treatment for underlying skin conditions.
Irritation
low
Source
synthetic
Strontium chloride is a gentle mineral salt that helps calm irritated skin and reduce redness, making it a solid choice for sensitive skin formulas.
Irritation
low
Source
synthetic
Strontium chloride hexahydrate is a mineral salt that can help calm reactive skin by temporarily reducing the sensation of stinging, itching, or flushing.
Irritation
low
Source
synthetic
Strontium hydroxide can help calm irritated skin by temporarily blocking nerve signals, but it is not a moisturizer or treatment for underlying skin conditions.
Irritation
low
Source
synthetic
A strong oxidizing agent used in hair bleaching that can be irritating; not common in everyday skincare.
Irritation
high
Source
synthetic
Strontium sulfide is an effective hair-removal chemical, but it can be harsh and irritating, especially for sensitive skin.
Irritation
high
Source
natural
Strontium thioglycolate is a common active in depilatory creams that dissolves hair, but it can be irritating and has a strong odor.
Irritation
moderate
Source
synthetic
A gentle, plant-based oil that helps soften and condition skin, but research on its benefits is still limited.
Irritation
low
Source
natural
A protein-rich ingredient from sturgeon fluid that may help hydrate and temporarily firm skin, but scientific evidence is limited and it comes with ethical and sustainability concerns.
Irritation
low
Source
natural
A novel, hydrating ingredient from sturgeon mucus that may help soothe and moisturize skin, but research is still limited.
Irritation
low
Source
natural
Styralyl Alcohol is a synthetic fragrance ingredient that adds a light floral scent but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds a sweet, floral scent to products; generally considered safe at low concentrations but may cause sensitivity in some individuals.
Irritation
low
Source
synthetic
Film Former
STYRENE/ACRYLATES/ETHYLHEXYL ACRYLATE/LAURYL ACRYLATE COPOLYMER
A synthetic polymer that helps makeup last longer and feel smoother, but offers no skincare benefit.
Irritation
low
Source
synthetic
A safe, synthetic film-former that helps makeup last longer and feel smoother, but it's not a skincare active.
Irritation
low
Source
synthetic
Film Former
Styrene/Methyltrimonium Chloride Crosspolymer
A synthetic polymer that helps reduce frizz and improve the feel of hair and skin, but offers no active skincare benefits.
Irritation
low
Source
synthetic
A synthetic polymer that helps products stay put, but offers no skin benefit and may feel stiff or heavy on some.
Irritation
low
Source
synthetic
A synthetic polymer that helps makeup and skincare last longer by forming a flexible, water-resistant film on skin or hair.
Irritation
low
Source
synthetic
Film Former
SODIUM STYRENE/METHOXY PEG-10 MALEATE/NONOXYNOL-10 MALEATE/ACRYLATES COPOLYMER
A synthetic polymer that helps products stay put and feel smooth, but offers no active skincare benefits.
Irritation
low
Source
synthetic
A synthetic film former that helps makeup and sunscreen stay put, but may feel heavy on some skin types.
Irritation
low
Source
synthetic
Film Former
STYRENE/ACRYLATES/DIMETHICONE ACRYLATE CROSSPOLYMER
A synthetic polymer that helps makeup stay put and feel silky, but offers no skincare benefit.
Irritation
low
Source
synthetic
A synthetic film-former that helps makeup last longer and resist water, but may feel heavy on some skin types.
Irritation
low
Source
synthetic
A synthetic polymer that helps makeup and sunscreen stay put longer, but offers no active skincare benefit.
Irritation
low
Source
synthetic
A synthetic powder that improves product feel and absorbs excess oil, but offers no active skincare benefits.
Irritation
low
Source
synthetic
A safe synthetic polymer that helps makeup and skincare products stay put without clogging pores or causing irritation.
Irritation
low
Source
synthetic
A safe, synthetic film-former that helps products stay put and resist water, but offers no skincare benefit itself.
Irritation
low
Source
synthetic
A synthetic polymer that helps makeup last longer and feel smoother, but offers no skincare benefit and may feel heavy on some skin types.
Irritation
low
Source
synthetic
A synthetic film-former that helps makeup and sunscreen last longer, but offers no active skincare benefit.
Irritation
low
Source
synthetic