Blue 2 (Indigo Carmine)
Also known as: Indigotine, FD&C Blue No. 2, CI 73015, SODIUM INDIGOTINDISULFONATE, INDIGO CARMINE, DISODIUM 5,5'-DISULFOINDIGO, 1H-INDOLE-5-SULFONIC ACID, 2-(1,3-DIHYDRO-3-OXO-5-SULFO-2H-INDOL-2-YLIDENE)-2,3-DIHYDRO-3-OXO-, DISODIUM SALT, (DELTA2,2'-BIINDOLINE)-5,5'-DISULFONIC ACID, 3,3'-DIOXO-, DISODIUM SALT, DISODIUM 2-(1,3-DIHYDRO-3-OXO-5-SULFO-2H-INDOL-2-YLIDENE)-2,3-DIHYDRO-3-OXO-1H-INDOLE-5-SULFONATE, DISODIUM 3,3'-DIOXO-(DELTA2,2'-BIINDOLINE)-5,5'-DISULFONATE, INDIGOTINE, C.I. ACID BLUE 74, ACID BLUE 74, C.I. 73015, C.I. FOOD BLUE 1, FOOD BLUE NO. 2, INDIGOTINDISULFONATE SODIUM
Color additive · E132
Regulatory Status
United States (FDA)
ApprovedFDA-approved. Also used as diagnostic dye in medical procedures.
European Union (EFSA)
ApprovedApproved in EU. ADI: 5 mg/kg body weight/day.
Safety Profile
Generally considered safe at food-use levels. The medical community uses it as a diagnostic dye, which provides additional safety data.
Health Concerns
- • Some animal studies show brain tumors at extremely high doses
- • Poor absorption limits concern
- • May cause nausea at high concentrations
Commonly Found In
Sources: FDA Substances Added to Food, EFSA opinions, EU Regulation 1333/2008, IARC monographs
SafeCheck provides drug interaction information from FDA-approved product labeling (openFDA). This is for informational purposes only and is not medical advice. Always consult your healthcare provider before making medication decisions.