Nylon-12 is a safe, non-irritating synthetic powder that gives makeup a silky feel and blurs imperfections without clogging pores.
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
Nylon-12 is a safe, non-irritating synthetic powder that gives makeup a silky feel and blurs imperfections without clogging pores.
Irritation
low
Source
synthetic
A synthetic optical brightener that makes products appear whiter or brighter, but with limited safety data and no proven skincare benefit.
Irritation
low
Source
synthetic
A synthetic powder that helps makeup and skincare glide on smoothly and stay put, with a low risk of irritation.
Irritation
low
Source
synthetic
Nylon-6 is a safe synthetic ingredient that improves the feel and wear of makeup and skincare, but it has no active skin benefits.
Irritation
low
Source
synthetic
Nylon-611 is a safe, non-irritating synthetic powder that gives makeup and skincare a silky, smooth finish while absorbing excess oil.
Irritation
low
Source
synthetic
A synthetic film-forming polymer that gives a silky, smooth feel and helps makeup last longer without clogging pores.
Irritation
low
Source
synthetic
Nylon-66 is a safe, non-irritating synthetic powder that improves the feel and wear of makeup, but it is not biodegradable.
Irritation
low
Source
synthetic
A gentle, antioxidant-rich flower extract that may help calm skin and fight free radical damage, but research is still emerging.
Irritation
low
Source
natural
A gentle, biotech-derived antioxidant from water lily cells that may help calm skin and fight free radical damage, though research is still early.
Irritation
low
Source
biotech
O-Allyloxyanisole is a synthetic fragrance ingredient with limited public safety data; it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
O-Aminophenol is a synthetic hair dye intermediate that helps create specific colors but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A synthetic hair dye ingredient that creates warm shades but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
O-Anisaldehyde is a synthetic fragrance compound that adds a sweet, floral scent to products but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
O-Cresyl Acetate is a synthetic fragrance ingredient that adds scent to products but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle synthetic preservative that helps keep your skincare products fresh and safe without common irritation.
Irritation
low
Source
synthetic
o-Tolualdehyde is a synthetic fragrance ingredient that adds a cherry-like scent but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
O-Tolyl Biguanide is an effective preservative but may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
Oak bark extract is a natural astringent and antioxidant that can help tighten pores and protect skin from environmental damage, but it may be drying for some skin types.
Irritation
low
Source
natural
A gentle, antioxidant-rich plant extract that may help protect skin from environmental stress, though human studies are limited.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research on its specific benefits for skin is still limited.
Irritation
low
Source
natural
Oak Gall Extract is a natural astringent that may help tighten pores and control oil, but it can be drying or irritating for sensitive skin types.
Irritation
moderate
Source
natural
Oak Root Extract is a gentle antioxidant-rich botanical that may help protect skin from environmental stress, but research on its specific benefits is still limited.
Irritation
low
Source
natural
A gentle, natural wood distillate that may help calm and clarify skin, but research is still emerging.
Irritation
low
Source
natural
Oakmoss extract is a classic natural fragrance ingredient with a rich, earthy scent, but it is also a common allergen that can cause skin reactions in sensitive individuals.
Irritation
moderate
Source
natural
Oat bran is a gentle, natural ingredient that soothes and moisturizes the skin, making it ideal for sensitive or irritated skin types.
Irritation
low
Source
natural
Oat bran extract is a gentle, natural ingredient that helps calm irritation and support the skin barrier, making it ideal for sensitive or reactive skin.
Irritation
low
Source
natural
A gentle, probiotic-based ingredient that helps calm irritation and strengthen the skin barrier, ideal for sensitive or reactive skin.
Irritation
low
Source
biotech
A gentle, plant-based juice that helps calm irritation and hydrate the skin, ideal for sensitive or reactive skin types.
Irritation
low
Source
natural
A gentle, natural exfoliant from oat hulls that polishes skin without harsh microbeads, ideal for sensitive skin types.
Irritation
low
Source
natural
Oat kernel extract is a gentle, antioxidant-rich ingredient that soothes and hydrates sensitive or irritated skin without clogging pores.
Irritation
low
Source
natural
Oat kernel flour is a gentle, soothing ingredient ideal for sensitive or irritated skin, offering mild exfoliation and moisture retention.
Irritation
low
Source
natural
A gentle, natural exfoliant and skin soother that's especially kind to sensitive and dry skin types.
Irritation
low
Source
natural
Oat kernel oil is a gentle, non-greasy emollient that softens and soothes dry or sensitive skin without clogging pores.
Irritation
low
Source
natural
Oat kernel protein is a gentle, hydrating ingredient that supports the skin barrier and soothes dryness without irritation.
Irritation
low
Source
natural
A gentle, antioxidant-rich extract that helps calm irritated skin and supports the skin barrier.
Irritation
low
Source
natural
A gentle, antioxidant-rich extract from oat leaves and stalks that helps calm and protect sensitive or irritated skin.
Irritation
low
Source
natural
A gentle, plant-based extract that helps calm irritated skin and provides antioxidant protection without clogging pores.
Irritation
low
Source
natural
Oat meal extract is a gentle, natural ingredient that calms irritation and supports the skin barrier, making it ideal for sensitive or reactive skin.
Irritation
low
Source
natural
Oat meristem cell extract is a gentle antioxidant-rich ingredient that may help calm skin and support a youthful appearance, though human studies are limited.
Irritation
low
Source
natural
Oat protein extract is a gentle, moisturizing ingredient that helps soothe and protect the skin barrier, making it ideal for sensitive or dry skin types.
Irritation
low
Source
natural
Oat seed water is a gentle, hydrating ingredient that helps calm sensitive or irritated skin without clogging pores.
Irritation
low
Source
natural
A gentle, antioxidant-rich oil from oat sprouts that helps soften and protect the skin without clogging pores.
Irritation
low
Source
natural
Oat straw extract is a gentle, antioxidant-rich ingredient that helps calm irritated skin and protect against environmental stress.
Irritation
low
Source
natural
Oatamide MEA is a mild, oat-based ingredient that helps cleansers foam gently while leaving skin and hair feeling soft and conditioned.
Irritation
low
Source
semi-synthetic
A gentle, plant-based surfactant that cleans without stripping, ideal for sensitive or dry skin.
Irritation
low
Source
natural
A mild, plant-derived conditioning ingredient that smooths hair and reduces static without heavy buildup.
Irritation
low
Source
semi-synthetic
A marine-inspired peptide that may help firm skin and reduce fine lines, but research is still limited compared to more established peptides.
Irritation
low
Source
synthetic
Ocimene is a natural fragrant terpene that adds a fresh, herbal scent to products, but it may cause skin sensitivity in some people, especially at higher concentrations.
Irritation
moderate
Source
natural
Ocotea Quixos Leaf Oil adds a warm, spicy scent and offers antimicrobial benefits, but its moderate irritation risk means it's best for those without sensitive skin.
Irritation
moderate
Source
natural
A gentle plant extract that may help calm skin and fight free radicals, though research is still early.
Irritation
low
Source
natural
Skin conditioning agent
Octacarboxymethyl Dipeptide-12 Lysinamide
A synthetic peptide that may help improve skin firmness and reduce fine lines, with low irritation potential.
Irritation
low
Source
synthetic
A gentle, waxy emollient that helps soften and smooth skin while supporting the moisture barrier.
Irritation
low
Source
synthetic
A gentle synthetic emollient that helps skin feel soft and smooth without clogging pores, making it a safe choice for most skin types.
Irritation
low
Source
synthetic
A gentle conditioning ingredient that helps reduce static and improve manageability in hair products, with a low risk of irritation.
Irritation
low
Source
synthetic
Octadecane is a safe, lightweight emollient that softens skin and improves product texture without clogging pores.
Irritation
low
Source
synthetic
A synthetic emollient that makes products feel silky and spread easily, but offers no active skincare benefits.
Irritation
low
Source
synthetic
A safe, synthetic film-former that helps makeup and sunscreen stay put longer without feeling heavy.
Irritation
low
Source
synthetic
A gentle film-forming polymer that improves product feel and wear, with very low irritation potential.
Irritation
low
Source
semi-synthetic
A gentle, plant-derived alternative to hydroquinone that helps fade dark spots and even out skin tone without the irritation.
Irritation
low
Source
natural
A synthetic fluoride compound used in toothpaste to strengthen enamel and prevent cavities, but not typically found in skincare.
Irritation
low
Source
synthetic