Blue 1
PlainFoodSafe flags Blue 1 as a synthetic dye. CSPI Chemical Cuisine rates it “Caution.” It appears in 17,024 indexed US food products. A California (schools) restriction takes effect2027-12-31.
Source-backed answer
Blue 1 appears in 17,024 catalogued products. CSPI rates it “Caution.” Its FDA SAFFA status is “Approved (certified color).” Those source labels describe the ingredient; they do not establish whether a particular product, dose, allergy, or diet is safe.
- 17,024
- catalogued products
- #50
- usage rank of 247,206
- 1,966
- named brands represented
- 83%
- average depth down ingredient lists
Catalog prevalence comes from Open Food Facts ingredient lists. FDA SAFFA and CSPI Chemical Cuisine labels are shown only when the source record contains them.
Blue 1: top-decile catalog footprint (#50 of 247,206)
- Usage rank
- #50
- of 247,206 ingredients that appear in at least one catalogued product.
- Typical depth in an ingredient list
- 83%
- Averaged label depth puts Blue 1 near the end of the captured list (83% of list length, mean slot 19.1). Compound ingredients and OCR noise mean this cannot stand in for quantity.
Derived by this site from the ingredient lists of every catalogued product (Open Food Facts), recomputed on each data refresh. 247,206 ingredients have at least one appearance and are ranked here. Usage and list position describe prevalence, not safety.
How common is Blue 1 vs other flagged additives?
Number of indexed products containing each of the most common flagged additives - Blue 1 highlighted.
How to use this page
Audit the co-occurring flags first
100% of the linked products contain at least one separately flagged ingredient, making co-occurrence the dominant follow-up question. That figure does not identify Blue 1 as the trigger. Open records such as 1 Wow!, Lollipop Bouquet; 1/2 Marble Grad Cake With Red Borders; 1/4 Sheet White Cake With Colored Icing and inspect which ingredient row carries the caution marker. The 19.5/100 product average is therefore a triage signal for this surrounding formulation set, not an ingredient verdict. Its 83% average label depth helps locate the term when checking the package.
100% of linked products contain a separately flagged ingredient
Processing is unusually concentrated here: Group 4 accounts for 17010 of 17012 NOVA-tagged records. That describes the surrounding products, not the substance. For a useful comparison, hold category and processing level constant, then inspect which named component changes alongside the caution flag; otherwise the product mix will confound the ingredient question.
Next check: open the lowest-scoring linked formulation and locate the exact caution-marked component.
What else is usually in the same product as Blue 1
Across the 17,024 products on this site that list Blue 1, these flagged additives appear alongside it most often. The comparison column is how often each one appears across every product with a parsed ingredient list, so the two figures are measured over the same set. Red 40 shows up about 13.9x more often with Blue 1 than in the catalogue at large.
| Additive | Shared products | Share of Blue 1 products | Share of all products |
|---|---|---|---|
| Red 40 | 12,817 | 75.3% | 5.4% |
| Yellow 5 | 11,186 | 65.7% | 4.8% |
| Yellow 6 | 7,465 | 43.8% | 3.4% |
| Red 3 | 3,406 | 20% | 1.1% |
| Titanium Dioxide | 3,271 | 19.2% | 2.1% |
Co-occurrence describes what manufacturers formulate together. It is not a claim that these additives interact, and it carries no regulatory meaning. Counted over products with parsed ingredient lists; Open Food Facts, 2026-09-01.
Safety Concerns
Synthetic dye
How do the sampled products compare?
Each point is one of the 16 sampled products listed below: its overall safety score against how many separately flagged ingredients its label carries. Bubble size is the number of ingredient rows the label actually resolved to.
Safety score vs. flagged-ingredient count for products containing Blue 1
Products Containing Blue 1
A sample of 16 high-volume listings among the 17,024 indexed products containing Blue 1:
Peer ingredients with comparable catalog mass (near “Butter”)
Blue 1 sits among other busy catalog rows (17,024 products, mean score 19.5/100). Nearest count peers include “Butter”, “Artificial Flavor”, “Honey”. Count peers and score peers are listed separately on purpose.
Similar product count
Nearest other ingredients by Open Food Facts product count (floored at ≥50).
Similar mean product score
Score-axis peers only, mean screening score among ingredients with ≥50 scored products, not a second count list.
Using the Blue 1 evidence
17,024 product rows plus any FDA/CSPI fields on Blue 1 are the evidence base — drill into the listings that matter for your decision.
- Check the listed products containing Blue 1 before treating the aggregate count as a personal conclusion. Open product sample
- Move to a second ingredient page and compare registry fields plus catalog mass side by side. Open a peer record
- Read how PlainFoodSafe joins source records before treating a screening label as a personal food or health conclusion. Read the methodology
This page describes published source classifications and product-label coverage. It is not dietary, allergy, or medical advice.
Questions readers ask about Blue 1
How should I read safety signals when Blue 1 sits in heavily flagged products? ▼
100% of linked products contain at least one separately flagged ingredient, so the first task is locating which row carries the caution marker — not assuming Blue 1 is the trigger. Where a source rating exists, Blue 1 scores 1/5 on this site's screening scale and CSPI lists it as "Caution" with FDA SAFFA status "Approved (certified color)". None of that replaces a product-, dose-, allergy-, or person-specific determination.
Which product shelves show up most often with Blue 1? ▼
Blue 1 ranks in the top decile by product count (#50 of 247,206), appearing in 17,024 indexed products led by Snacks. The sample list below is a slice of that footprint, not the full universe.
Why is Blue 1 so common on ingredient lists? ▼
The source record does not name a technical effect, yet Blue 1 appears in 17,024 products (#50 usage rank). High prevalence here describes formulation frequency, not an approved use level.
Regulatory status: FDA SAFFA (Blue 1). Safety ratings: CSPI Chemical Cuisine; product presence: Open Food Facts via PlainFoodSafe (September 2026). Figures are computed from those sources, no editor-typed counts. Methodology · State regulations.