Fd&c Red No. 3

FD&C Red No. 3, chemically known as 2,4,5,7-tetraiodofluorescein disodium salt (CAS Number: 16423-68-0), is a synthetic colorant belonging to the xanthene dye family. It is derived from fluorescein and is characterized by its bright red to pink hue. The additive is lipophobic, meaning it does not dissolve well in oils, which affects its application in different food matrices. In the United States, it is regulated as a color additive by the FDA and is identified by the designation FD&C Red No. 3.

Historically, FD&C Red No. 3 has been used primarily in beverages, particularly maraschino cherry brines, cocktail mixes, and some candy formulations. Its use in processed foods has been limited compared to other synthetic colorants. The additive was more commonly employed in pharmaceutical and cosmetic applications than in food products. In some countries, erythrosine continues to be used in specific food categories, while its presence in the United States food supply has diminished significantly over the past two decades due to regulatory concerns and industry reformulation efforts.

FD&C Red No. 3 underwent extensive toxicological evaluation before its approval as a food colorant. The FDA reviewed comprehensive safety data including acute, subchronic, and chronic toxicity studies. According to FDA records, there have been zero reported adverse events specifically attributed to FD&C Red No. 3 consumption through the FDA's adverse event reporting system, and zero product recalls directly linked to this colorant.

In animal studies, the primary concern identified was potential thyroid effects at very high doses in rodent models. These findings led to ongoing regulatory scrutiny and the establishment of acceptable daily intake (ADI) limits. The International Agency for Research on Cancer (IARC) has not classified erythrosine as a carcinogen to humans. The European Food Safety Authority (EFSA) has also conducted safety assessments of erythrosine (E127 in the EU), establishing safe use levels for approved food categories.

The additive contains iodine as part of its chemical structure, which has been noted in safety discussions, though the bioavailability of iodine from FD&C Red No. 3 is considered negligible under normal consumption patterns.

In the United States, FD&C Red No. 3 is not on the FDA's GRAS (Generally Recognized as Safe) list, meaning it does not have blanket approval as safe. However, it has been approved for specific food applications under FDA regulations as a color additive. The additive operates under a provisional status in certain categories, and the FDA has conducted ongoing reviews of its safety profile.

In the European Union, erythrosine (E127) is permitted as a food colorant in specific applications, including certain confectionery and beverages, subject to maximum use levels. Different countries maintain varying regulatory positions on this colorant.

Regulatory agencies have noted that use of FD&C Red No. 3 in foods has declined voluntarily by manufacturers, who have increasingly substituted it with other approved colorants such as FD&C Red No. 40 (allura red).

The safety assessment of FD&C Red No. 3 is based on decades of toxicological research conducted by both regulatory agencies and independent laboratories. Early studies examined the colorant's absorption, distribution, metabolism, and excretion in animal models. Long-term feeding studies in rats and dogs established NOEL (no observed effect level) values that inform current acceptable daily intake determinations.

More recent literature reviews by regulatory bodies continue to assess emerging data on the safety profile of erythrosine. The absence of documented adverse event reports in association with FD&C Red No. 3 consumption provides epidemiological support for its safety when used within approved limits. However, the regulatory decision to maintain non-GRAS status reflects the agency's commitment to ongoing monitoring and the availability of alternative colorants for most food applications.