Basic Orange 1

Basic Orange 1 and pregnancy

Not Recommended

• Carcinogen concern
• Absorbed into the body

Basic Orange 1 is a synthetic azo dye used in hair coloring products. It is classified as a potential carcinogen by the EU Scientific Committee on Consumer Safety (SCCS) and has demonstrated mutagenic properties in laboratory studies. According to ACOG, pregnant women should avoid exposure to known or suspected carcinogens and mutagens, as these can pose risks to fetal development. The EU has banned Basic Orange 1 from all cosmetic products due to safety concerns, including its carcinogenic potential. Azo dyes can be absorbed through the scalp and skin, leading to systemic exposure during pregnancy. While specific pregnancy outcome studies are limited, the carcinogenic and mutagenic properties are sufficient cause for avoidance. ACOG and dermatologists recommend that pregnant women avoid hair dyes containing potentially carcinogenic ingredients. The EU ban on this ingredient reflects the precautionary principle that should be applied during pregnancy. Given that safer hair coloring alternatives exist, Basic Orange 1 should be completely avoided throughout pregnancy.

Basic Orange 1 and breastfeeding

Not Recommended

• Carcinogen concern
• Passes into breast milk

Basic Orange 1 is a synthetic azo dye banned in the EU due to carcinogenic and mutagenic concerns. When applied to the scalp, the dye can be absorbed systemically through the skin. The AAD and lactation experts recommend avoiding known carcinogens during breastfeeding due to potential transfer into breast milk and infant exposure. While specific studies on milk transfer of Basic Orange 1 are lacking, its systemic absorption and concerning toxicity profile warrant complete avoidance. The EU's cosmetic ban on this ingredient reflects serious safety concerns that are particularly relevant for breastfeeding mothers. Breastfeeding mothers should choose hair coloring products that do not contain banned or carcinogenic ingredients. Many safer alternatives exist for achieving orange or red hair tones. The ingredient should be avoided until after weaning, and even then, safer alternatives are strongly preferred.

Basic Orange 1 and postpartum

Not Recommended

• Carcinogen concern

Basic Orange 1 is classified as a potential carcinogen and is banned in EU cosmetics. Even for postpartum women not breastfeeding, exposure to carcinogenic compounds should be avoided. The EU ban and SCCS warnings about carcinogenic potential apply to all populations. Postpartum women should prioritize their long-term health by avoiding ingredients with established cancer concerns. Numerous safer hair dye alternatives exist that do not carry these risks.

Basic Orange 1 and trying to conceive

Not Recommended

• Carcinogen concern
• Builds up in tissue

Basic Orange 1 is classified as a potential carcinogen and mutagen. Women planning pregnancy should avoid exposure to mutagenic substances, as these can theoretically affect egg quality or early embryonic development. While specific fertility studies are lacking, the mutagenic properties and EU ban make this ingredient inappropriate for women trying to conceive. Pre-conception health optimization includes avoiding known carcinogens and mutagens. Women TTC should switch to safer hair coloring alternatives well before attempting conception.

Basic Orange 1 and PCOS

Not Recommended

• Carcinogen concern

Basic Orange 1 is a carcinogenic azo dye banned in EU cosmetics. While it does not have specific hormone-disrupting properties relevant to PCOS, its carcinogenic classification makes it unsuitable for use by any population. Women with PCOS have no specific additional concerns beyond the general carcinogenic risk that applies to everyone. The ingredient should be avoided due to its cancer potential, not due to PCOS-specific mechanisms. Given that women with PCOS are already managing a complex health condition, they should not introduce additional health risks through cosmetic ingredient exposure. Safer hair coloring alternatives are readily available.

Basic Orange 1 and general use

Not Recommended

• Carcinogen concern
• Common allergen

Basic Orange 1 is a synthetic azo dye historically used in hair coloring to produce orange and reddish tones. It belongs to a class of dyes that have undergone extensive safety scrutiny due to concerns about carcinogenic potential. The EU Scientific Committee on Consumer Safety has classified Basic Orange 1 as a potential carcinogen based on animal studies showing mutagenic properties and tumor formation. The ingredient is banned from all cosmetic products in the European Union under Annex II (prohibited substances). It can also cause allergic contact dermatitis and skin sensitization, particularly in individuals with azo dye sensitivities. The FDA restricts its use in the United States, and many manufacturers have voluntarily removed it from formulations. Due to its cancer concerns and regulatory restrictions, Basic Orange 1 should be avoided by all consumers regardless of age or health status. Modern hair dye formulations offer numerous safer alternatives that achieve similar color results without carcinogenic risks. Check ingredient labels and avoid products containing CI 48035 or Basic Orange 1.

Everything else flagged for the same profiles

• Flagged in pregnancy
• Flagged in breastfeeding
• Flagged in postpartum
• Flagged in trying to conceive
• Flagged in PCOS

Related ingredients

Ingredients suggested in place of Basic Orange 1, each one with its own page here.

• Henna

Ingredients that raise the same concerns.

• MenadioneCarcinogen concern, Builds up in tissue, Passes into breast milk
• P-PhenylenediamineCarcinogen concern, Builds up in tissue, Passes into breast milk
• Basic Brown 17Carcinogen concern, Builds up in tissue, Passes into breast milk
• 1-NaphtholCarcinogen concern, Builds up in tissue, Passes into breast milk
• Toluene-2,5-DiamineCarcinogen concern, Builds up in tissue, Passes into breast milk
• Tosylamide/Formaldehyde ResinCarcinogen concern, Builds up in tissue, Passes into breast milk

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 15 September 2026.