A synthetic antioxidant that may help shield skin from pollution and UV damage, but research is still early.
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 antioxidant that may help shield skin from pollution and UV damage, but research is still early.
Irritation
low
Source
synthetic
Skin brightening agent
Hydroxyphenyl Thiazinane Carboxylic Acid
A gentle, synthetic brightener that works by slowing melanin production, offering a milder alternative to hydroquinone.
Irritation
low
Source
synthetic
A gentle yet effective retinoid that works like retinoic acid without the typical redness and peeling.
Irritation
low
Source
semi-synthetic
A synthetic ester that helps nail polishes and hair products form flexible, durable films without making them brittle.
Irritation
low
Source
synthetic
Hydroxyproline is a collagen-building amino acid that may help firm and hydrate skin with minimal irritation risk.
Irritation
low
Source
natural
A gentle peptide-like ingredient that may help improve skin firmness and hydration with low irritation risk.
Irritation
low
Source
semi-synthetic
An effective film-former for nail products, but not a common or recommended ingredient in everyday facial skincare due to potential irritation and limited benefit.
Irritation
moderate
Source
synthetic
A gentle, amino-acid-based conditioner that helps repair damaged hair and skin without weighing them down.
Irritation
low
Source
semi-synthetic
Antistatic Agent
Hydroxypropyl Bis-Hydroxyethyldimonium Chloride
A gentle, synthetic conditioning ingredient that helps reduce frizz and static while improving the feel of hair and skin.
Irritation
low
Source
synthetic
Antistatic Agent
Hydroxypropyl Biscetearyldimonium Chloride
A gentle synthetic conditioning agent that helps detangle and soften hair without heavy buildup, but may not suit those avoiding quaternary ammonium compounds.
Irritation
low
Source
synthetic
A gentle synthetic conditioner that smooths hair and softens skin without heavy buildup.
Irritation
low
Source
synthetic
Antistatic Agent
Hydroxypropyl Bisisostearamidopropyldimonium Chloride
A synthetic conditioning ingredient that helps reduce static and improve the feel of hair and skin without heavy buildup.
Irritation
low
Source
synthetic
A gentle synthetic ingredient that helps hair feel soft and smooth without heavy buildup, but it's not a star performer on its own.
Irritation
low
Source
synthetic
A gentle, plant-derived conditioning ingredient that reduces static and improves manageability without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle synthetic ingredient that helps condition skin and stabilize formulas, with a low risk of irritation.
Irritation
low
Source
synthetic
A gentle synthetic conditioner that improves feel and manageability without heavy buildup.
Irritation
low
Source
synthetic
A gentle synthetic conditioner that reduces static and softens hair without heavy buildup.
Irritation
low
Source
synthetic
A synthetic conditioning agent that helps reduce static and improve manageability, but its iodine content raises mild safety questions for sensitive skin.
Irritation
moderate
Source
synthetic
A gentle silicone derivative that smooths skin and locks in moisture without clogging pores.
Irritation
low
Source
semi-synthetic
A gentle silicone derivative that improves product texture and skin feel, with a low risk of irritation or clogged pores.
Irritation
low
Source
semi-synthetic
A gentle silicone emollient that improves product texture and skin feel without clogging pores or causing irritation.
Irritation
low
Source
semi-synthetic
Emulsifier
HYDROXYPROPYL DIMETHICONE/POLYSORBATE 20 CROSSPOLYMER
A gentle silicone-based stabilizer that helps keep formulas smooth and well-mixed without clogging pores.
Irritation
low
Source
semi-synthetic
Film Former
Hydroxypropyl Dimethiconylpropyl Acrylates Copolymer
A silicone polymer that helps makeup and skincare last longer and feel smooth, with a very low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A safe, effective thickener that gives gels and creams a smooth, non-sticky feel without clogging pores.
Irritation
low
Source
synthetic
Conditioning Agent
Hydroxypropyl Guar Hydroxypropyltrimonium Chloride
A gentle, plant-derived conditioning polymer that reduces frizz and static without heavy buildup.
Irritation
low
Source
semi-synthetic
A synthetic film-former that helps nail polish and some cosmetics resist wear and water, but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle, plant-based thickener that gives products a smooth, non-greasy feel without clogging pores.
Irritation
low
Source
semi-synthetic
A gentle film-forming ingredient that helps products spread smoothly and stay put without clogging pores.
Irritation
low
Source
semi-synthetic
A gentle, plant-derived thickener that improves texture and stability without clogging pores or irritating skin.
Irritation
low
Source
semi-synthetic
Antistatic Agent
Hydroxypropyl Oxidized Starch PG-Trimonium Chloride
A gentle, plant-derived conditioning agent that reduces frizz and static without weighing hair down, also suitable for sensitive skin.
Irritation
low
Source
semi-synthetic
Brightening agent
Hydroxypropyl Phenylhydrazinoyl T-Butylcarbamate
A synthetic ingredient that targets dark circles by reducing pigmentation and improving microcirculation, best for under-eye use.
Irritation
low
Source
synthetic
Humectant
HYDROXYPROPYL STREPTOCOCCUS ZOOEPIDEMICUS FERMENT FILTRATE
A gentle, biotech-derived humectant that boosts skin hydration and supports a healthy moisture barrier without irritation.
Irritation
low
Source
biotech
A gentle, synthetic humectant that draws moisture into the skin without the stickiness of glycerin, making it a good option for lightweight hydration.
Irritation
low
Source
synthetic
Hair Conditioning
HYDROXYPROPYL TRIMONIUM CORN/WHEAT/SOY AMINO ACIDS
A gentle, plant-derived conditioning ingredient that adds softness and manageability to hair without heavy buildup.
Irritation
low
Source
natural
A gentle, amino-acid-based humectant that helps hydrate and soothe skin without irritation.
Irritation
low
Source
semi-synthetic
A safe, plant-derived thickener that gives products a smooth, non-greasy feel and helps stabilize formulas.
Irritation
low
Source
semi-synthetic
Viscosity Controlling
Hydroxypropylcellulose Stearyl Carbamate
A gentle, semi-synthetic thickener and stabilizer that improves product texture without clogging pores or irritating skin.
Irritation
low
Source
semi-synthetic
A gentle silicone derivative that smooths skin and hair without heavy buildup, suitable for most skin types.
Irritation
low
Source
semi-synthetic
A gentle silicone that improves product feel and spreadability with a very low risk of irritation or clogged pores.
Irritation
low
Source
synthetic
A synthetic solvent that helps other ingredients blend and spread, but has limited direct skin benefit and is best reserved for nail and hair formulas.
Irritation
low
Source
synthetic
A gentle, sugar-derived humectant that helps hydrate skin without stickiness, suitable for sensitive and dry skin types.
Irritation
low
Source
semi-synthetic
A gentle, stable vitamin C derivative that brightens skin and fights free radicals without the sting of pure ascorbic acid.
Irritation
low
Source
semi-synthetic
Hair Conditioning
HYDROXYPROPYLTRIMONIUM CORN/WHEAT/SOY AMINO ACIDS
A gentle, plant-derived conditioning ingredient that improves hair and skin feel without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, protein-derived conditioning ingredient that helps reduce static and smooth hair without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, positively charged honey derivative that helps hair and skin retain moisture and reduces static without the stickiness of raw honey.
Irritation
low
Source
semi-synthetic
A gentle, high-performance hyaluronic acid derivative that sticks to skin better than standard HA for deeper, longer-lasting hydration.
Irritation
low
Source
semi-synthetic
Hair conditioning agent
HYDROXYPROPYLTRIMONIUM HYDROLYZED CASEIN
A gentle, protein-based conditioning ingredient that helps strengthen hair and improve manageability with low irritation risk.
Irritation
low
Source
semi-synthetic
Hair Conditioning Agent
Hydroxypropyltrimonium Hydrolyzed Collagen
A gentle, modified collagen that adds slip and softness to hair and skin without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioner
Hydroxypropyltrimonium Hydrolyzed Corn Starch
A gentle, plant-derived conditioning agent that helps detangle hair and reduce static without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioner
HYDROXYPROPYLTRIMONIUM HYDROLYZED RICE PROTEIN
A gentle, plant-derived conditioning agent that helps reduce frizz and improve manageability without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, modified silk protein that smooths hair and reduces static without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioner
HYDROXYPROPYLTRIMONIUM HYDROLYZED SOY PROTEIN
A gentle, plant-derived conditioning ingredient that helps hair feel soft and smooth without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioning Agent
HYDROXYPROPYLTRIMONIUM HYDROLYZED VEGETABLE PROTEIN
A gentle, plant-derived conditioning ingredient that strengthens and smooths hair and skin without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioning Agent
HYDROXYPROPYLTRIMONIUM HYDROLYZED WHEAT PROTEIN
A gentle, conditioning protein that strengthens hair, reduces frizz, and adds moisture without heavy buildup.
Irritation
low
Source
semi-synthetic
Conditioning Agent
HYDROXYPROPYLTRIMONIUM HYDROLYZED WHEAT STARCH
A gentle, plant-derived conditioning agent that improves hair feel and manageability without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, protein-derived conditioning ingredient that adds softness and manageability to hair without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, plant-based conditioning ingredient that makes hair softer and less frizzy without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, plant-derived conditioning ingredient that helps detangle hair and soften skin without heavy buildup.
Irritation
low
Source
semi-synthetic
Film Former
Hydroxypropyltrimonium Maltodextrin Crosspolymer
A gentle, starch-derived polymer that smooths hair and skin without heavy buildup or irritation.
Irritation
low
Source
semi-synthetic
Film Former
Hydroxypropyltrimonium Oxidized Potato Starch
A gentle, plant-derived ingredient that helps hair feel smooth and reduces frizz without heavy buildup.
Irritation
low
Source
semi-synthetic