HC Orange No. 6 is a synthetic dye that adds orange tones to hair color, but it may cause skin 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 Orange No. 6 is a synthetic dye that adds orange tones to hair color, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red 18 is a synthetic dye that adds red shades to hair color, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red No. 1 is a synthetic hair dye that adds red tones but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red No. 10 is a synthetic dye used in hair color products; it is generally considered safe for external use but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red No. 11 is a synthetic hair dye that adds red tones but may cause irritation in sensitive individuals or with frequent use.
Irritation
moderate
Source
synthetic
A synthetic red hair dye that can deliver vibrant color but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red No. 14 is a synthetic dye used in hair color products; it is generally considered safe for use on hair but may cause irritation for sensitive scalps.
Irritation
moderate
Source
synthetic
HC Red No. 15 is a synthetic dye for red hair color, but it may cause irritation in sensitive individuals and has limited safety data for long-term use.
Irritation
moderate
Source
synthetic
HC Red No. 17 is a synthetic hair dye that adds red tones but may cause scalp irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Red No. 18 is a synthetic colorant for hair dyes that can cause irritation in sensitive individuals, but is generally considered safe for use in rinse-off products.
Irritation
moderate
Source
synthetic
HC Red No. 3 is a widely used synthetic hair dye colorant, but it may cause skin irritation in sensitive individuals and has limited long-term safety data.
Irritation
moderate
Source
synthetic
HC Red No. 7 is a synthetic colorant for hair dyes that can cause irritation in sensitive individuals, especially with frequent use.
Irritation
moderate
Source
synthetic
HC Violet No. 1 is a synthetic dye that adds violet tones to hair, commonly used to neutralize brassiness or create cool shades, but it may cause mild irritation in sensitive individuals.
Irritation
low
Source
synthetic
HC Violet No. 2 is a synthetic hair dye that adds violet tones but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 10 is a common synthetic hair dye that adds yellow shades but may cause irritation for sensitive scalps.
Irritation
moderate
Source
synthetic
HC Yellow No. 13 is a synthetic colorant used in hair dyes, generally considered safe in rinse-off products but may cause irritation for sensitive scalps.
Irritation
moderate
Source
synthetic
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. 15 is a synthetic yellow dye for hair color, generally considered safe in rinse-off products but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 16 is a synthetic colorant used in hair dyes, generally considered safe in regulated concentrations but may cause irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 17 is a synthetic yellow dye for hair color that is generally considered safe in rinse-off products but may cause irritation for sensitive scalps.
Irritation
moderate
Source
synthetic
HC Yellow No. 2 is a synthetic dye that adds yellow tones to hair color, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 4 is a synthetic hair dye that adds yellow shades to hair color products, but it may cause skin irritation in sensitive individuals.
Irritation
moderate
Source
synthetic
HC Yellow No. 7 is a synthetic hair dye that can provide vibrant yellow shades, but it may cause irritation in sensitive individuals and is not intended for skin or eyelash use.
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
Film Former
HDI/DI-C12-14 ALKYL TARTRATE/HYDROGENATED DILINOLEYL ALCOHOL COPOLYMER
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 last longer and feel smoother, but offers no skincare benefit.
Irritation
low
Source
synthetic
A gentle synthetic film-former that helps makeup and skincare products feel smooth, last longer, and resist water without clogging pores.
Irritation
low
Source
synthetic
A gentle synthetic polymer that creates a smooth, long-wearing film on skin without clogging pores or causing irritation.
Irritation
low
Source
synthetic
Hea Succinate is a synthetic film-former that helps products spread smoothly and feel lightweight on skin, with a low risk of irritation.
Irritation
low
Source
synthetic
A gentle, antioxidant-rich botanical extract that may help calm skin and protect against environmental stress.
Irritation
low
Source
natural
A mild, aromatic floral water that may offer soothing and antioxidant benefits, but lacks strong clinical evidence for specific skincare claims.
Irritation
low
Source
natural
Hectorite is a gentle clay that helps control shine and thicken formulas without stripping the skin.
Irritation
low
Source
natural
A gentle plant extract with antioxidant potential, but research is limited compared to more established botanical ingredients.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant potential, but research is limited and it's not a skincare powerhouse.
Irritation
low
Source
natural
HEDTA is a safe, effective chelating agent that helps your products stay stable and fresh without causing irritation.
Irritation
low
Source
synthetic
A gentle botanical extract with antioxidant potential, but research on its skincare benefits is still limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help calm skin and provide light fragrance, but research on its specific benefits is still limited.
Irritation
low
Source
natural
A gentle botanical extract that may help calm skin and provide antioxidant support, though research is still emerging.
Irritation
low
Source
natural
Heilmoor Clay is a gentle, mineral-rich clay that helps absorb excess oil and impurities without over-drying, making it a good option for normal to oily skin types.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that helps protect skin from environmental stress, though research is still emerging.
Irritation
low
Source
natural
A gentle, plant-based wax that helps lock in moisture and create a smooth, protective layer on the skin.
Irritation
low
Source
natural
A gentle, lab-grown antioxidant extract that helps calm skin and fight environmental stress without irritation.
Irritation
low
Source
biotech
A gentle, aromatic hydrosol that may help calm skin and provide antioxidant support, but research is limited.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that helps calm skin and protect against environmental stress, but research is still emerging.
Irritation
low
Source
natural
Helichrysum flower oil is a gentle, antioxidant-rich oil that may help calm skin and fight free radical damage, but it's best used in low concentrations due to its potency.
Irritation
low
Source
natural
A mild, aromatic hydrosol that can help calm and soothe the skin while providing a pleasant natural scent.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that helps calm and protect skin from environmental stress.
Irritation
low
Source
natural
A gentle botanical extract that helps protect skin from environmental stress and may calm irritation.
Irritation
low
Source
natural
A gentle, lab-grown plant cell extract that may help protect skin from environmental stress and calm irritation, though research is still emerging.
Irritation
low
Source
biotech
A gentle, antioxidant-rich botanical extract that helps calm skin and defend against environmental stress.
Irritation
low
Source
natural
A gentle, antioxidant-rich botanical extract that may help calm skin and protect against environmental stress, though human studies are limited.
Irritation
low
Source
natural
A gentle botanical extract with antioxidant and soothing benefits, best for calming sensitive or stressed skin.
Irritation
low
Source
natural
A gentle, plant-based wax that helps lock in moisture and gives a smooth, non-greasy feel to skincare products.
Irritation
low
Source
natural
A gentle, plant-derived antioxidant that may help protect skin from environmental stress, though research is still early.
Irritation
low
Source
natural
A gentle, plant-based powder that may help calm skin and fight free radicals, but research is still early.
Irritation
low
Source
natural
Heliotropine is a synthetic fragrance ingredient that adds a sweet, floral, cherry-like scent to products, but offers no direct skincare benefit.
Irritation
low
Source
synthetic
HEMA is a common nail ingredient that can cause allergic reactions in some people, so patch testing is recommended.
Irritation
moderate
Source
synthetic
HEMA Acetoacetate is a synthetic ingredient used in nail products for strong adhesion, but it can be a skin sensitizer for some people.
Irritation
moderate
Source
synthetic
A gentle conditioning polymer that helps hair feel soft and reduces frizz without heavy buildup.
Irritation
low
Source
synthetic
HEMA Maleate helps products stick and last longer, but it can be a skin sensitizer for some people, especially in nail formulas.
Irritation
moderate
Source
synthetic