Ingredient
Disperse Black 9
Disperse Black 9 is flagged for pregnancy and general use. The concern behind the strongest flag is absorbed into the body.
- CI 20505
- C.I. Disperse Black 9
- Solvent Black 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
Disperse Black 9 and pregnancy
Caution Advised
- Absorbed into the body
Disperse Black 9 is a synthetic hair dye colorant that can be absorbed through the scalp, particularly when applied to large areas or left on for extended periods. While primarily used topically, some systemic absorption does occur, raising questions about fetal exposure. Specific pregnancy safety data for this ingredient is limited. ACOG states that hair dye use during pregnancy is likely safe in small amounts, but recommends minimizing exposure, especially in the first trimester. The concern with Disperse Black 9 specifically is its allergen potential and the lack of comprehensive reproductive toxicity studies. Some chemical hair dyes have been associated with theoretical risks, though definitive evidence of harm is lacking. Most obstetricians suggest that pregnant women who wish to dye their hair wait until after the first trimester and use semi-permanent dyes rather than permanent ones, ventilate the area well, and minimize scalp contact. While there are no absolute prohibitions on this ingredient, many doctors recommend postponing cosmetic hair coloring or choosing alternatives like henna or vegetable-based dyes during pregnancy.
Disperse Black 9 and breastfeeding
Safe to Use
Disperse Black 9 is used in hair dye products where it is applied to the scalp and hair. While some absorption through the scalp can occur, the amounts that would enter the bloodstream from typical cosmetic use are generally considered low. There is limited specific data on transfer of this colorant to breast milk. However, dermatologists generally consider hair dye use safe during breastfeeding, as the amount that could potentially reach breast milk is minimal. The primary concern is more about the mother's allergic reaction risk rather than infant exposure through milk. Most healthcare providers agree that occasional hair dyeing while breastfeeding poses minimal risk. To further minimize any theoretical risk, women can apply dyes in well-ventilated areas, avoid contact with the infant's skin immediately after application, and consider highlighting techniques that don't touch the scalp.
Disperse Black 9 and postpartum
Safe to Use
- Common allergen
For postpartum women not breastfeeding, Disperse Black 9 can be used in hair dyes with the standard precautions. The main concern is the ingredient's allergenic potential rather than any reproductive or systemic health risks. Postpartum hormonal changes can sometimes increase skin sensitivity, so women who previously tolerated this ingredient should still perform a patch test before full application. Following product instructions and ensuring good ventilation are important for safe use.
Disperse Black 9 and trying to conceive
Safe to Use
Disperse Black 9 is a hair dye colorant with minimal systemic absorption when used as directed in cosmetic products. There is no evidence that it affects fertility, ovulation, or reproductive function in women trying to conceive. While comprehensive fertility studies are lacking, the ingredient's use is limited to external application and does not accumulate in the body. Women trying to conceive can use hair dyes containing this ingredient, though some may choose to minimize chemical exposure during this time as a personal precaution. This is more a matter of individual preference than medical necessity.
Disperse Black 9 and PCOS
Safe to Use
Disperse Black 9 is a colorant with no known hormonal activity or effects on androgen levels. It does not function as an endocrine disruptor and has no impact on the hormonal imbalances characteristic of PCOS. For women with PCOS, this ingredient poses no specific concerns beyond the general allergic reaction risk that affects all users. It does not interfere with PCOS treatments or affect insulin sensitivity. Women with PCOS can use products containing this ingredient following standard safety precautions, including patch testing before use. The colorant has no bearing on PCOS symptoms or management.
Disperse Black 9 and general use
Caution Advised
- Common allergen
- Irritant
Disperse Black 9 is used primarily in hair coloring products to achieve dark shades. It is effective as a colorant but is known to be one of the more allergenic ingredients in hair dye formulations. The main health concern with this ingredient is its potential to cause allergic contact dermatitis, which can develop even in people who have previously used the product without problems. Symptoms can include scalp itching, redness, swelling, and in severe cases, facial swelling. Studies show that sensitization can occur with repeated exposure, and reactions may worsen over time. EU regulations require products containing Disperse Black 9 to include warnings about allergic reactions and recommend patch testing 48 hours before use. Users should perform this test before each application, as sensitivity can develop even after years of safe use. People with a history of dye allergies or sensitive skin should exercise particular caution or consider alternative colorants.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Disperse Black 9, 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 .
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