Ingredient
HC Red No. 3
HC Red No. 3 is flagged for pregnancy and general use. The concern behind the strongest flag is absorbed into the body.
- HC Red 3
- 2-Nitro-P-Phenylenediamine
- Hair Color Red 3
Verdict by profile
Truva checks every ingredient against six profiles. Jump to any of them for the full assessment.
- Strongest verdict
- Caution Advised
- Its verdict for pregnancy, the profile this one is worst in
- Profiles flagged
- 2 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 3 of 5
- Higher means more likely to sting or redden
HC Red No. 3 and pregnancy
Caution Advised
- Absorbed into the body
HC Red No. 3 is a synthetic hair dye molecule in the nitrophenylenediamine family. It's used in semi-permanent and oxidative hair coloring products to provide red tones. Like other hair dyes, it's designed to penetrate the hair shaft, which means some skin absorption can occur during application. While specific pregnancy studies on HC Red No. 3 are limited, ACOG states that hair dye use is generally considered safe during pregnancy, particularly after the first trimester. However, the organization notes that it's reasonable to minimize chemical exposures during pregnancy. Some healthcare providers recommend being more cautious during the first trimester when fetal organ development is occurring. The systemic absorption of hair dyes is relatively low, but the small molecular size of these dyes means some absorption does occur through the scalp. Most dermatologists and obstetricians advise that occasional hair dyeing (every trimester or less frequently) is unlikely to pose significant risk, especially after the first trimester. Some women choose to wait until the second trimester as an extra precaution or opt for highlighting techniques that don't touch the scalp. The SCCS has established concentration limits for this ingredient in hair dyes, which are designed to minimize exposure while allowing for effective coloring.
This one changes across the pregnancy.
- First trimester
- CAUTION
- Second trimester
- SAFE
- Third trimester
- SAFE
HC Red No. 3 and breastfeeding
Safe to Use
HC Red No. 3 is a hair dye ingredient applied to the scalp and hair. While some absorption through the scalp occurs, the amount that reaches systemic circulation and potentially breast milk is considered minimal. The AAD and most dermatologists consider hair dye use to be compatible with breastfeeding. The small molecular weight of hair dye ingredients means some systemic absorption occurs, but studies have not detected significant concentrations in breast milk. The exposure to breastfed infants is considered negligible compared to the mother's direct scalp exposure. There are no specific guidelines from ACOG or the AAP (American Academy of Pediatrics) recommending avoidance of hair dyes during breastfeeding. Most healthcare providers consider hair dyeing safe while breastfeeding, though some recommend applying products in well-ventilated areas to minimize inhalation exposure.
HC Red No. 3 and postpartum
Safe to Use
- Common allergen
- Irritant
HC Red No. 3 is a hair dye ingredient that can be used during the postpartum period without specific concerns for non-breastfeeding women. The main considerations are the same as for the general population: potential for skin irritation and allergic reactions. Postpartum hormonal changes can sometimes make skin more sensitive, so patch testing is particularly important if you're trying a new hair dye product. Otherwise, there are no additional restrictions for postpartum use compared to normal use.
HC Red No. 3 and trying to conceive
Safe to Use
HC Red No. 3 is a hair dye ingredient with no known effects on fertility or reproductive function. While it's absorbed to a small degree through the scalp, this exposure level has not been linked to fertility concerns. There are no specific recommendations to avoid hair dyes while trying to conceive. However, some women prefer to minimize chemical exposures during this time as a precautionary measure. If you do conceive while using hair dye, the exposure is not considered harmful to early pregnancy, though you may want to follow pregnancy guidelines once confirmed.
HC Red No. 3 and PCOS
Safe to Use
HC Red No. 3 is a synthetic hair dye ingredient used for coloring. It has no known hormonal activity or effects on androgen levels. For women with PCOS, this ingredient poses no specific concerns. It doesn't affect hormone balance, insulin sensitivity, or other metabolic factors associated with PCOS. There are no contraindications for using hair dyes containing this ingredient with PCOS. The main considerations are the same as for the general population: potential for skin irritation or allergic reactions, which should be assessed through patch testing.
HC Red No. 3 and general use
Caution Advised
- Common allergen
- Irritant
HC Red No. 3 is a synthetic hair dye in the nitrophenylenediamine family, used to create red tones in hair coloring products. It works by penetrating the hair shaft to deposit color molecules. The main concerns with this ingredient are allergic contact dermatitis and skin sensitization. According to the SCCS, HC Red No. 3 has been associated with allergic reactions in sensitive individuals. The EU Cosmetics Regulation requires patch testing instructions on all hair dye products, and severe reactions, though rare, can occur. Repeated exposure can increase sensitization risk in some people. This ingredient is regulated by the EU with maximum concentration limits (2.0% in semi-permanent dyes, 1.5% in oxidative dyes) and required warning labels. The FDA monitors hair dye safety through adverse event reporting. Always perform a patch test 48 hours before use as directed on product labels, especially if you have a history of allergies or sensitive skin.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of HC Red No. 3, each one with its own page here.
Ingredients that raise the same concerns.
Where this came from
Truva summarises published guidance from bodies including ACOG, the FDA, the EU SCCS and the Cosmetic Ingredient Review. It has no access to your medical history and it is not a substitute for your doctor, dermatologist or midwife. These assessments have not been reviewed by a clinician, and nothing here is a diagnosis or a prescription. If you are pregnant, breastfeeding or being treated for PCOS, take the ingredient list to the person looking after you.
Assessment last pulled from the ingredient database on .
One ingredient is the easy case.
A label has thirty of them. Truva reads the whole list at once and answers for the profile you set: pregnancy, breastfeeding, postpartum, trying to conceive, PCOS, or general use.
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