HC Yellow No. 14 is a synthetic yellow dye for hair color, generally considered safe in regulated concentrations but may cause irritation in sensitive individuals.
Irritation
moderate
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
HC Yellow No. 14 is a synthetic yellow dye for hair color, generally considered safe in regulated concentrations but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 9 is a synthetic colorant used in hair dyes, generally considered safe for most people but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
A gentle conditioning polymer that helps hair feel soft and reduces frizz without heavy buildup.
Irritation
low
Source
synthetic
Henna is a natural colorant and conditioner, but its safety depends on purity and source—avoid products with added metallic salts or synthetic dyes.
Irritation
low
Source
natural
Henna extract is a natural colorant and conditioner, but it can cause allergic reactions in sensitive individuals and may not be suitable for all hair types.
Irritation
low
Source
natural
Hexadimethrine Chloride helps hair hold its shape and reduces static, but it can be drying or irritating for sensitive scalps.
Irritation
moderate
Source
synthetic
A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.
Irritation
low
Source
synthetic
Hydrogen Dimethicone is a gentle silicone that smooths and protects skin and hair without clogging pores or causing irritation.
Irritation
low
Source
synthetic
A gentle silicone that smooths skin and hair without clogging pores, making it a reliable choice for most skin types.
Irritation
low
Source
synthetic
A lightweight silicone that helps products spread smoothly and feel silky, but may not suit those avoiding silicones.
Irritation
low
Source
synthetic
A synthetic polymer that helps makeup and sunscreen stay put longer, but offers no active skincare benefits.
Irritation
low
Source
synthetic
Film Former
HYDROGENATED ACETOPHENONE/OXYMETHYLENE COPOLYMER
A synthetic film former that helps products stay put and resist water, but offers no active skincare benefit.
Irritation
low
Source
synthetic
Film Former
HYDROGENATED DIMER DILINOLEYL/DIMETHYLCARBONATE COPOLYMER
A silicone alternative that forms a flexible, breathable film on skin and hair, offering long-lasting hold and moisture without heavy buildup.
Irritation
low
Source
semi-synthetic
An effective emulsifier and antistatic agent, but may cause irritation or clog pores in sensitive individuals.
Irritation
moderate
Source
synthetic
A conditioning ingredient that reduces static and softens hair, but may be too heavy for fine hair or acne-prone skin.
Irritation
moderate
Source
semi-synthetic
A conditioning ingredient derived from animal fats that softens hair and reduces static, but may cause irritation or clog pores in sensitive individuals.
Irritation
moderate
Source
semi-synthetic
A conditioning agent derived from tallow that softens hair and reduces static, but may be too heavy for fine hair or acne-prone skin.
Irritation
moderate
Source
semi-synthetic
A gentle, plant-based protein that helps hair and skin retain moisture and feel stronger without irritation.
Irritation
low
Source
natural
A gentle, plant-derived protein that helps strengthen hair and lightly moisturize skin without irritation.
Irritation
low
Source
natural
A gentle, plant-based protein that can temporarily strengthen hair and lightly moisturize skin without irritation.
Irritation
low
Source
natural
A gentle, plant-based protein that helps hydrate and strengthen skin and hair without irritation.
Irritation
low
Source
natural
A gentle, dual-action ingredient that hydrates and smooths skin and hair without heavy residue.
Irritation
low
Source
semi-synthetic
A collagen-silicon hybrid that helps smooth and hydrate skin and hair, but its anti-aging benefits are mostly surface-level.
Irritation
low
Source
semi-synthetic
A gentle, protein-rich ingredient from pearl shells that helps smooth hair and temporarily plump skin by forming a light film.
Irritation
low
Source
natural
A gentle, protein-based surfactant that cleans without stripping, making it ideal for sensitive skin and hair.
Irritation
low
Source
semi-synthetic
Hair Conditioning Agent
HYDROLYZED CORN/SOY/WHEAT PROTEIN THIOGLYCOLAMIDE/THIOPROPIONAMIDE
A modified plant protein that bonds to hair to strengthen and repair damage, but its synthetic modification may not suit all preferences.
Irritation
low
Source
semi-synthetic
Hydrolyzed egg protein is a gentle, natural ingredient that helps strengthen hair and temporarily smooth the skin's surface, but it is not a deep moisturizer or repair agent.
Irritation
low
Source
natural
A synthetic film-former that helps products stay put, but offers no active skincare benefits.
Irritation
low
Source
synthetic
A fish-derived protein that temporarily strengthens hair and lightly hydrates skin, best for those seeking natural, protein-rich formulas.
Irritation
low
Source
natural
A gentle, plant-based protein that can temporarily strengthen hair and lightly moisturize skin without clogging pores.
Irritation
low
Source
natural
A gentle, plant-derived protein that can help strengthen hair and temporarily smooth the skin's surface without irritation.
Irritation
low
Source
natural
Hydrolyzed honey protein is a gentle, natural humectant that hydrates and strengthens skin and hair without clogging pores.
Irritation
low
Source
natural
A lightweight, non-greasy moisturizer derived from jojoba oil that hydrates and softens skin and hair with minimal irritation risk.
Irritation
low
Source
natural
A gentle, plant-derived protein that helps strengthen hair and lightly moisturize skin without irritation.
Irritation
low
Source
natural
Hair Conditioning Agent
HYDROLYZED KERATIN PG-PROPYL METHYLSILANEDIOL
A protein-silicone hybrid that temporarily repairs hair damage and adds shine without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair conditioning agent
HYDROLYZED KERATIN PG-PROPYL SILANETRIOL
A protein-silicone hybrid that helps strengthen and smooth hair, but may build up over time with heavy use.
Irritation
low
Source
semi-synthetic
Hair conditioning agent
HYDROLYZED KERATIN PG-PROPYLMETHYLSILANEDIOL
A protein-silicone hybrid that helps strengthen and smooth hair without heavy buildup.
Irritation
low
Source
semi-synthetic
Hydrolyzed lupine protein is a gentle, plant-based protein that helps strengthen hair and lightly moisturize skin without irritation.
Irritation
low
Source
natural
A gentle, plant-derived conditioning ingredient that helps hair and skin feel soft and smooth without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, plant-based protein that may help strengthen hair and temporarily smooth skin, but research is limited compared to more established proteins like keratin or collagen.
Irritation
low
Source
natural
A gentle conditioning ingredient derived from milk protein that helps hair feel softer and more manageable without heavy buildup.
Irritation
low
Source
semi-synthetic
Hair Conditioning Agent
HYDROXYPROPYLTRIMONIUM HYDROLYZED OAT PROTEIN
A gentle, positively charged oat protein that clings to hair and skin to reduce frizz, add softness, and improve moisture retention without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, protein-based ingredient that helps strengthen and repair damaged hair by filling in gaps in the hair shaft.
Irritation
low
Source
natural
A gentle, plant-based protein that helps strengthen hair and lightly moisturize skin without common allergens.
Irritation
low
Source
natural
A gentle, multi-tasking ingredient that helps hair feel smoother and skin look plumper by depositing a lightweight, moisturizing film.
Irritation
low
Source
semi-synthetic
A gentle, protein-based conditioner from rice bran that adds softness and manageability to hair and a smooth feel to skin.
Irritation
low
Source
natural
Film Former
HYDROXYPROPYLTRIMONIUM HYDROLYZED RICE PROTEIN/SILOXYSILICATE
A gentle, dual-action ingredient that deposits a protective film on hair and skin, offering conditioning and shine without heavy buildup.
Irritation
low
Source
semi-synthetic
Hydrolyzed Sericin is a gentle silk protein that helps skin and hair retain moisture and feel smooth, with a low risk of irritation.
Irritation
low
Source
natural
A gentle, plant-based protein that strengthens hair and lightly hydrates skin without common irritation or clogging.
Irritation
low
Source
natural
Film Former
HYDROLYZED SESAME PROTEIN PG-PROPYL METHYLSILANEDIOL
A gentle conditioning ingredient that helps hair and skin feel smooth and protected without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle film-forming ingredient derived from silk that helps smooth and protect skin and hair without heavy residue.
Irritation
low
Source
semi-synthetic
A gentle, semi-synthetic ingredient that combines silk proteins with a silicone-like molecule to improve skin softness and hair smoothness without heavy residue.
Irritation
low
Source
semi-synthetic
A gentle, plant-derived protein that helps hydrate and strengthen skin and hair without irritation.
Irritation
low
Source
natural
Hydrolyzed Soy Protein is a gentle, plant-derived ingredient that helps hair and skin hold onto moisture and feel smoother, but it's not a deep repair agent.
Irritation
low
Source
natural
Conditioning agent
Hydrolyzed Soy Protein/Vegetable Amino Acids/Lysine Hydroxypropyltrimonium Chloride
A gentle conditioning ingredient that deposits a protective film on hair and skin, improving moisture and manageability without heavy buildup.
Irritation
low
Source
semi-synthetic
A gentle, dual-action ingredient that helps hair and skin feel smooth and hydrated without heavy buildup.
Irritation
low
Source
semi-synthetic
Film Former
HYDROLYZED SOY PROTEIN PG-PROPYL METHYLSILANEDIOL
A gentle, film-forming ingredient that adds shine and manageability to hair while providing light moisture to skin.
Irritation
low
Source
semi-synthetic
A gentle, plant-based ingredient that helps skin and hair feel smooth and hydrated without clogging pores.
Irritation
low
Source
natural
A gentle, plant-derived protein that helps hydrate and strengthen skin and hair without common irritation.
Irritation
low
Source
natural
A gentle, plant-based protein that helps skin and hair retain moisture and feel smoother.
Irritation
low
Source
natural