A lightweight synthetic emollient that helps products spread smoothly without a greasy feel, generally well-tolerated by most skin types.
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 lightweight synthetic emollient that helps products spread smoothly without a greasy feel, generally well-tolerated by most skin types.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient with limited public safety data; best for those who tolerate fragrance well.
Irritation
moderate
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skincare benefits and may irritate sensitive skin.
Irritation
moderate
Source
synthetic
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 provides scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic floral scent ingredient that can cause skin irritation in sensitive individuals, especially at higher concentrations.
Irritation
moderate
Source
synthetic
A synthetic floral scent that can be a skin sensitizer for some people, especially those with fragrance allergies.
Irritation
moderate
Source
synthetic
A lightweight, low-irritation humectant that helps products feel silky and can boost preservative power without adding stickiness.
Irritation
low
Source
synthetic
A selenium-based antioxidant that may help protect skin from oxidative stress, but research is still emerging.
Irritation
low
Source
synthetic
A selenium-based antioxidant that may help protect skin from oxidative stress, but research is still emerging and it's less common than traditional antioxidants.
Irritation
low
Source
semi-synthetic
Methylserine is a gentle, water-attracting amino acid derivative that helps hydrate and condition the skin, but research on its long-term benefits is still limited.
Irritation
low
Source
synthetic
A silicon-amino acid hybrid that may help smooth and condition skin, but research is limited.
Irritation
low
Source
semi-synthetic
A silicon-enhanced amino acid that supports skin firmness and resilience, best for aging or stressed skin.
Irritation
low
Source
semi-synthetic
A gentle, stabilized vitamin C derivative that pairs antioxidant protection with silicon for added skin-firming benefits.
Irritation
low
Source
semi-synthetic
Skin conditioning agent
METHYLSILANOL CARBOXYMETHYL THEOPHYLLINE
A silicon-modified theophylline that may help temporarily firm and smooth skin, but evidence is limited and mostly from older studies.
Irritation
low
Source
semi-synthetic
Antioxidant
METHYLSILANOL CARBOXYMETHYL THEOPHYLLINE ALGINATE
A hybrid ingredient that may offer mild antioxidant and skin-firming effects, but human research is very limited.
Irritation
low
Source
semi-synthetic
A silicon-enhanced elastin derivative that may help improve skin firmness and hydration, but research is limited and mostly from ingredient suppliers.
Irritation
low
Source
semi-synthetic
A gentle, hybrid ingredient that combines the soothing power of licorice root with the skin-conditioning benefits of silicon, ideal for sensitive or redness-prone skin.
Irritation
low
Source
semi-synthetic
A silicon-enhanced amino acid that may help support skin firmness and collagen production, but human evidence is limited.
Irritation
low
Source
semi-synthetic
A silicon-amino acid complex that may support collagen production and skin firmness, but research is limited and mostly from ingredient suppliers.
Irritation
low
Source
semi-synthetic
Methylsilanol PCA is a gentle, silicon-based humectant that helps hydrate and smooth the skin, often used in anti-aging products.
Irritation
low
Source
semi-synthetic
A gentle silicone-like emollient that adds a silky feel to products without heavy greasiness.
Irritation
low
Source
semi-synthetic
A gentle film-forming ingredient that temporarily smooths skin texture and blurs imperfections without clogging pores.
Irritation
low
Source
synthetic
A hybrid ingredient that combines the antioxidant power of spirulina with the film-forming, skin-smoothing benefits of silicon, making it a gentle option for firming and anti-aging products.
Irritation
low
Source
semi-synthetic
A gentle, silicone-based emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
semi-synthetic
A synthetic compound that may help support skin firmness and reduce fine lines, but research is still early and it's not a proven anti-aging powerhouse.
Irritation
low
Source
synthetic
A synthetic fragrance ingredient that adds scent but offers no skin benefit and may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic film-former that helps makeup and sunscreen last longer and resist water, but offers no active skincare benefit.
Irritation
low
Source
synthetic
Anti-aging agent
Methylsulfinylbutyl Piperidinecarbothioamide
A synthetic compound that may help reduce fine lines and wrinkles by supporting collagen and elastin, but research is still early.
Irritation
low
Source
synthetic
Anti-Wrinkle Agent
Methylsulfonylpiperidinylamino Dioxothiomorpholinomethyl Phenylindole
A high-tech synthetic ingredient that may help soften expression lines, but research is still early and it's mostly found in premium products.
Irritation
low
Source
synthetic
A synthetic antioxidant that may help protect skin from environmental damage, but research is still early.
Irritation
low
Source
synthetic
A synthetic scent ingredient that adds a warm, nutty note to products but offers no skincare benefit.
Irritation
low
Source
synthetic
A potent antimicrobial from wasabi that may help with acne and inflammation, but its strong nature requires careful formulation.
Irritation
moderate
Source
natural
A synthetic UVA filter that helps protect skin from sun damage, generally considered safe and non-irritating.
Irritation
low
Source
synthetic
A gentle, synthetic peptide that helps calm redness and irritation, making it a good choice for sensitive or reactive skin.
Irritation
low
Source
synthetic
A synthetic silicone that helps products resist water and last longer on skin or hair.
Irritation
low
Source
synthetic
A synthetic silicone that helps makeup and skincare last longer by forming a breathable, water-resistant film.
Irritation
low
Source
synthetic
Methylundecanal is a synthetic fragrance ingredient that adds a fresh, citrusy scent, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Methylvaleric Acid is a synthetic fatty acid used mainly for scent and pH control; it has limited direct skin benefit and may cause irritation in sensitive individuals at higher levels.
Irritation
moderate
Source
synthetic
Mevalonolactone is a mild PHA exfoliant that gently smooths skin without the irritation of stronger acids, making it a good choice for sensitive skin.
Irritation
low
Source
synthetic
A lab-made peptide that signals skin to act firmer and smoother, with good tolerability for most skin types.
Irritation
low
Source
synthetic
A synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging.
Irritation
low
Source
synthetic
A lab-made peptide that may help tighten loose skin by signaling collagen support, but research is still early.
Irritation
low
Source
synthetic
A synthetic peptide that mimics a natural skin signal to help support collagen and improve firmness, but research is still emerging.
Irritation
low
Source
synthetic
A synthetic peptide that may help improve skin firmness and reduce fine lines, but research is still emerging.
Irritation
low
Source
synthetic
A gentle botanical extract with antioxidant potential, but research on its cosmetic benefits is still limited.
Irritation
low
Source
natural
A fragrant wood oil that adds a warm, woody scent to products but may irritate sensitive skin if used at high levels.
Irritation
moderate
Source
natural
A gentle plant extract with antioxidant and soothing potential, but research on its direct skin benefits is still limited.
Irritation
low
Source
natural
Mica is a safe, non-irritating mineral that gives products a luminous finish, but ethical sourcing is a concern.
Irritation
low
Source
natural
A fragrant leaf oil that adds a pleasant floral scent and mild conditioning to products, but may cause irritation in sensitive skin.
Irritation
moderate
Source
natural
A gentle, aromatic flower extract with antioxidant potential, best known for its pleasant scent and mild soothing effects.
Irritation
low
Source
natural
Effective for treating fungal skin issues, but not a general skincare ingredient and may cause irritation in some.
Irritation
moderate
Source
synthetic
A lab-grown microalgae extract that may help calm skin and fight free radical damage, though human studies are still limited.
Irritation
low
Source
biotech
A gentle microalgae extract that helps hydrate and condition skin, though research is still emerging.
Irritation
low
Source
natural
Humectant
THALASSIOSIRA AESTIVALIS/GRAVIDA/NITZSCHIOIDES/NORDENSKIOELDII/ROTULA EXTRACT
A blend of marine microalgae that helps hydrate and protect the skin with antioxidant benefits, though research on this specific mix is still emerging.
Irritation
low
Source
natural
A gentle, antioxidant-rich algae blend that may help hydrate and protect skin, though research is still emerging.
Irritation
low
Source
natural
A gentle, nutrient-rich oil from microalgae that helps moisturize and support skin barrier function without clogging pores.
Irritation
low
Source
natural
A marine-derived peptide with promising antioxidant potential, but human studies are still limited.
Irritation
low
Source
natural
Microbial cellulose is a gentle, plant-free film former that helps lock in moisture and gives products a smooth, silky feel.
Irritation
low
Source
biotech
A gentle, antioxidant-rich fruit extract that may help brighten skin and protect against environmental damage, but more human studies are needed.
Irritation
low
Source
natural