FD&C RED NO. 3
FD&C Red No. 3, also known as erythrosine or Red Dye No. 3, is a synthetic red color additive historically used to impart a bright cherry red hue to foods, beverages, and certain ingested drug products, but regulatory actions in the United States are removing its authorization for such uses.
What It Is
FD&C Red No. 3 is a synthetic color additive classified chemically as a tetraiodofluorescein derivative that has been used to impart a cherry-red to pink hue in a range of food products and some pharmaceutical formulations. It belongs to a class of colorants known for their bright and stable red appearance under typical food processing conditions. The additive has long been identified by multiple names in regulatory lists and chemical literature, including erythrosine, Food Red 14, and Acid Red 51, reflecting its multiple synonyms and naming systems across jurisdictions. While historically permitted as a certified color additive in the United States under color additive regulations, recent administrative actions have revoked its authorization for use in food and ingested drugs, effectively phasing it out of permitted applications. In jurisdictions outside the United States, the compound is often designated by its E number or international numbering system, where it continues to be evaluated and regulated under different frameworks. The compound’s chemical structure, a polyiodinated fluorescein derivative, contributes to its distinctive red color and influences its interaction with food matrices and other ingredients.
How It Is Made
FD&C Red No. 3 is synthesized through chemical processes that assemble the tetraiodofluorescein core with sodium counterions to form a water-soluble red dye. The manufacturing process typically begins with precursor aromatic compounds that undergo controlled iodination to introduce multiple iodine atoms, which are key to the chromophore responsible for the compound’s absorption properties and color. Subsequent purification and conversion to the disodium salt form improve water solubility, which is an important characteristic for use in aqueous food systems. After synthesis, the substance is subjected to quality control procedures to ensure consistency of color strength, purity, and compliance with regulatory specifications where permitted. Historically, the additive has also been converted into lake forms—insoluble pigment variants bound to metal salts—for use in applications where water solubility is not desired, such as in certain confectionery coatings or cosmetics. However, detailed proprietary process steps are typically controlled by manufacturers and are subject to industrial confidentiality. In regulatory monographs, specifications describe acceptable purity levels and impurity limits, ensuring that commercially available additive meets defined standards.
Why It Is Used In Food
The primary purpose of FD&C Red No. 3 in food formulations has been to provide a vivid red color that is visually attractive to consumers. Color plays an important role in consumer perception, often signalling flavor expectations and overall product quality, and synthetic colorants like erythrosine were historically chosen for their stability under a range of processing conditions and ability to impart consistent hue at low use levels. In applications such as candies, frostings, icings, and preserved cherries, this bright red additive contributed to product appeal and helped maintain uniformity from batch to batch. The dye’s stability in the presence of light and heat relative to some natural colorants made it especially useful where processing or storage conditions might otherwise degrade color. While its use has been popular for aesthetic reasons, it does not contribute to the taste or nutritional value of food products. Instead, its role has been purely visual, aiming to enhance consumer appeal through color, which is a key factor in purchase decisions and perceived freshness in many types of foods.
Adi Example Calculation
To illustrate how an acceptable daily intake benchmark might be contextualized, imagine a hypothetical adult weighing 70 kilograms. If an international expert body sets an ADI at what has been historically expressed as a range up to a conservative level for regulatory purposes, a person of this body weight would have a daily intake limit that corresponds to a small fraction when translated into milligrams per kilogram of body weight and multiplied by total body mass. This example calculation is illustrative and does not imply that any amount of the additive should be intentionally consumed at that level; rather, it demonstrates how regulators use body weight to scale risk thresholds and compare them with typical levels of additive use across food categories.
Safety And Health Research
Safety evaluations conducted by international expert bodies and national regulators have focused on toxicology, long-term intake, and potential effects observed in experimental systems. These assessments consider data from chronic studies in animals, including findings from research on rodent thyroid tumors at high exposure levels, and weigh this evidence in the context of human relevance, metabolism, and typical dietary exposure, which is often much lower than the levels used in such studies. The Joint FAO/WHO Expert Committee on Food Additives has confirmed an acceptable daily intake range that reflects levels below which exposure is considered not to pose a safety concern based on available data. Safety research continues to explore how the compound is absorbed, distributed, metabolized, and excreted, and whether any specific subpopulations may have different sensitivities. Regulatory authorities periodically reassess the body of evidence, and newly available studies can influence decisions. Although historical data have informed safety benchmarks, the application of specific legal provisions in certain jurisdictions has led to regulatory changes grounded in policy frameworks rather than new quantitative risk assessments.
Regulatory Status Worldwide
The regulatory status of FD&C Red No. 3 varies considerably across jurisdictions and has been the subject of significant change in recent years. In the United States, the Food and Drug Administration (FDA) issued an order in January 2025 revoking authorization for the use of FD&C Red No. 3 in food and ingested drugs, effective with phased compliance deadlines in 2027 for foods and 2028 for ingested drugs, based on legal provisions that prohibit the approval of additives linked to cancer in animal studies. This action represents a major shift from historical listings under the color additive regulations. By contrast, in many other parts of the world, regulatory bodies have maintained allowances for specific uses under defined conditions. In the European Union, this compound is recognized under a food additive numbering system and has been subject to restrictions, with permitted uses historically limited to certain processed cherries and similar products rather than broad applications across all foods. International evaluations, such as those conducted by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), have established acceptable daily intake standards that have informed regulations in multiple countries. National food standards outside the United States may continue to list erythrosine or related compounds in their schedules of permitted additives with specific use limits included.
Taste And Functional Properties
FD&C Red No. 3 is regarded as having minimal to no impact on the taste or aroma of food products at the concentrations at which it has been used. This lack of sensory interference has historically contributed to its selection in formulations where strong color results are desired without altering the underlying taste profile. Its functional behavior in aqueous systems is defined by its solubility and dispersion characteristics, which allow it to distribute uniformly in water-based foods, confectionery syrups, and drink formulations. Thermal stability and resistance to common food-processing conditions, such as baking or freezing, vary with the specific food matrix, but generally the dye retains its chromatic properties across a range of conditions relevant to food production. Unlike natural colors that may degrade or shift hue with changes in pH, synthetic colorants like erythrosine have been valued for a more predictable performance in diverse environments. Because the substance does not serve as a preservative or nutritive compound, its functional role remains strictly as a visual enhancer within the overall sensory experience of the product.
Acceptable Daily Intake Explained
An acceptable daily intake, or ADI, is a scientific benchmark used by food safety authorities to describe the amount of a substance that can be consumed every day over a lifetime without appreciable risk. It reflects a conservative threshold derived from toxicology studies, typically with safety factors applied to account for uncertainties in extrapolating animal data to humans, variation among individuals, and data limitations. For additives like FD&C Red No. 3, international expert evaluations have used observed effect levels in animal studies and applied uncertainty factors to establish a value intended to cover lifetime exposure. While an ADI provides a useful reference for regulators and industry when considering permitted use levels and dietary exposure assessments, it is not a recommendation for intentional consumption, nor does it represent a target intake. Instead, it serves as a tool to guide regulatory decisions and ensure that typical exposures remain well below levels associated with adverse effects in experimental studies.
Comparison With Similar Additives
Color additives used in foods span a range of chemical structures and regulatory histories. For example, other red synthetic dyes have been subject to separate evaluations and approvals that differ from FD&C Red No. 3, with some remaining widely used due to their regulatory status and performance. Natural colorants, such as pigments derived from beetroot or paprika, offer alternatives that many manufacturers choose to meet consumer preferences for "natural" ingredients, although they can vary in stability and hue compared with synthetic dyes. In contrast to synthetic red dyes that have more permissive authorization in some markets, FD&C Red No. 3 has seen tightening in regulatory status in key markets due to specific legal provisions. These distinctions underscore how regulatory approaches, consumer demand, and functional requirements influence which color additives are selected for particular applications, and how evolving scientific assessments drive changes in permitted uses over time.
Common Food Applications Narrative
Historically, FD&C Red No. 3 has been incorporated in a variety of processed foods where a red or pink appearance is desired. These have included confectionery items such as hard and soft candies, brightly colored frostings used on cakes and cupcakes, decorative sprinkles, and preserved fruits like maraschino and candied cherries, where the vibrant color is a key part of product identity and consumer expectation. Beyond sweets, other applications have included beverage syrups and drink mixes, frozen desserts, and bakery decorations that benefit from a stable red hue that withstands typical processing stresses. In some regions, similar uses have extended to topical pharmaceuticals and orally ingested drug coatings where a specific visual appearance assists with product recognition and dosing cues. The use of this colorant was often governed by good manufacturing practice to achieve the desired visual effect without exceeding necessary levels. However, recent regulatory developments in the United States have set timelines to phase out its use in foods and ingested medicines, prompting manufacturers to reformulate with alternative colorants or natural pigments. As a result, products that once contained FD&C Red No. 3 are transitioning to other approved color additives or botanically derived colors that impart red tones. The historical pattern of use reflects the importance of color in food presentation and how regulatory landscapes can drive shifts in ingredient selection.
Safety & Regulations
FDA
- Notes: Authorization for use in food and ingested drugs has been revoked by FDA as referenced by authoritative agency communication.
EFSA
- Notes: Numeric ADI established by international expert committees; specific EFSA numeric value not directly available on deep link.
- E Number: 127
- Adi Display: 0-0.1 mg per kg body weight
JECFA
- Year: 2018
- Notes: JECFA ADI confirmed on database entry.
- Ins Number: 127
- Adi Display: 0-0.1 mg per kg body weight
- Adi Mg Per Kg: 0.1
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