Baby Safety / Compounds / Brilliant Blue FCF (FD&C Blue No. 1)

Is Brilliant Blue FCF (FD&C Blue No. 1) safe for babies and kids?

Moderate risk for kids

Infants are more vulnerable to Brilliant Blue FCF (FD&C Blue No. 1) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What is brilliant blue fcf (fd&c blue no. 1)?

The IUPAC name is disodium;2-[[4-[ethyl-[(3-sulfonatophenyl)methyl]amino]phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]benzenesulfonate.

Also known as: disodium;2-[[4-[ethyl-[(3-sulfonatophenyl)methyl]amino]phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]benzenesulfonate, Brilliant Blue FCF, Brilliant Blue, FD&C Blue No. 1.

IUPAC name
disodium;2-[[4-[ethyl-[(3-sulfonatophenyl)methyl]amino]phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]benzenesulfonate
CAS number
3844-45-9
Molecular formula
C37H34N2Na2O9S3
Molecular weight
792.9 g/mol
SMILES
CCN(CC1=CC(=CC=C1)S(=O)(=O)[O-])C2=CC=C(C=C2)C(=C3C=CC(=[N+](CC)CC4=CC(=CC=C4)S(=O)(=O)[O-])C=C3)C5=CC=CC=C5S(=O)(=O)[O-].[Na+].[Na+]
PubChem CID
19700

Risk for babies

Moderate risk

Infants are more vulnerable to Brilliant Blue FCF (FD&C Blue No. 1) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters the metabolism and distribution of Brilliant Blue FCF (FD&C Blue No. 1), potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

4 regulatory and scientific bodies have classified Brilliant Blue FCF (FD&C Blue No. 1). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2020Not evaluated by IARC for carcinogenicity — Brilliant Blue FCF (FD&C Blue No. 1; E133) is a triphenylmethane dye food colorant not classified as carcinogenic by any major regulatory agency; not involved in the Southampton hyperactivity study (unlike tartrazine and Sunset Yellow); the primary safety concern is a very rare but serious adverse event — Brilliant Blue intravenously or into body cavities causes methemoglobin-forming blue discoloration (Blue Man syndrome) at massive parenteral doses; no established carcinogenicity from food additive use
EPA CTX / IARC—Group 3 - Not classifiable as to its carcinogenicity to humans
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 14 positive / 6 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 14 positive / 6 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter brilliant blue fcf (fd&c blue no. 1)

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles
  • Consumer Products — food products, candy, beverages, cosmetics, supplements

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Brilliant Blue FCF (FD&C Blue No. 1):

  • Fragrance-free formulations
    Trade-offs: Consumer preference for scented products
    Relative cost: Lower (ingredient elimination)
  • Essential oil-based fragrances (with disclosure)
    Trade-offs: Natural does not mean safe — many essential oils are skin sensitizers
    Relative cost: 2-5× conventional
  • Vitamin E
    Relative cost: 1.2-2×
  • Rosemary extract
    Relative cost: 1.2-2×
  • Green tea extract (EGCG)
    Relative cost: 1.2-2×

Frequently asked questions

Is brilliant blue fcf (fd&c blue no. 1) safe for kids?

Infants are more vulnerable to Brilliant Blue FCF (FD&C Blue No. 1) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What products contain brilliant blue fcf (fd&c blue no. 1)?

Brilliant Blue FCF (FD&C Blue No. 1) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); food products (Consumer products).

What should I do if my child is exposed to brilliant blue fcf (fd&c blue no. 1)?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about brilliant blue fcf (fd&c blue no. 1)?

Brilliant Blue FCF (FD&C Blue No. 1) has been classified by 4 agencies including IARC, EPA CTX / IARC, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

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Sources (1)
  1. Brilliant Blue FCF FD&C Blue 1 E133 Triphenylmethane CI 42090; FDA 2003 Patient Safety Alert Enteral Tube Feeding Methemoglobinemia Deaths; Methemoglobin Formation IV Enteral Parenteral Not Oral Food; EFSA ADI 6 mg/kg/day; Not Southampton Six No Hyperactivity Warning EU; Spirulina Phycocyanin Butterfly Pea Flower Indigo Natural Blue Alternatives; FDA 21 CFR 74.101 Certified Color; Triphenylmethane Aerobic Resistant Ozone Photolysis; Algae EC50 10-50 mg/L Aquatic; IARC Not Evaluated Not Carcinogen (2020) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →