Food Additive · CAS 2809-21-4
1-hydroxyethylidene-1,1-diphosphonic Acid
FDA status: Approved. EU: not separately listed. No U.S. state has enacted a specific ban yet.
According to the U.S. Food and Drug Administration, 1-hydroxyethylidene-1,1-diphosphonic Acid is FDA-approved, and no U.S. state has moved to restrict it independently of federal policy. Its composite safety score is 4 out of 5 (Low Risk).
The verdict
1-hydroxyethylidene-1,1-diphosphonic Acid is FDA-approved, and no U.S. state has moved to restrict it.
- 4/5
- Low Risk
- Approved
- FDA status
- -
- EU status
- 0
- state regulations
CAS-led regulatory snapshot
1-hydroxyethylidene-1,1-diphosphonic Acid: no OFF product match; CAS 2809-21-4 is the lead registry handle on this row.
| Property | Value | Source |
|---|---|---|
| CAS Number | 2809-21-4 | CAS Registry |
| FDA Status | Approved | FDA SAFFA |
| EU Status | Not separately listed | EC 1333/2008 |
| E-Number | - | EU additive register |
| Category | Food Additive | FDA functional class |
| Composite Safety Score | 4 / 5 (Low Risk) | PlainIngredients methodology |
| EFSA ADI | Not established | EFSA scientific opinion |
| U.S. State Actions | 0 states | State legislative records |
| Tracked Products | Not yet tracked | Open Food Facts (US) |
Values reflect official agency classifications as published by the U.S. Food and Drug Administration and the European Union's regulatory framework. See our methodology for scoring details.
What is 1-hydroxyethylidene-1,1-diphosphonic Acid?
1-hydroxyethylidene-1,1-diphosphonic Acid (CAS 2809-21-4) is an FDA-regulated food substance used as boiler water additive.
Common Uses
Catalog-profile peer axes
Nationwide catalog-profile peers for 1-hydroxyethylidene-1,1-diphosphonic Acid
Product-count (0) and safety-score (4/5) peer columns, disjoint link sets.
Score 4/5 peers (≥50 OFF products)
Nearest other additives by PlainIngredients safety score (floored at ≥50 tracked products), distinct from the count row.
Frequently Asked Questions
Is 1-hydroxyethylidene-1,1-diphosphonic Acid safe to consume?
1-hydroxyethylidene-1,1-diphosphonic Acid scores 4/5 (Low Risk). FDA status is Approved. No OFF product match yet; the distinctive registry handle is CAS 2809-21-4, so this page leads with the chemical identity row rather than a shelf-prevalence claim.
What is 1-hydroxyethylidene-1,1-diphosphonic Acid used for in food?
1-hydroxyethylidene-1,1-diphosphonic Acid (CAS 2809-21-4) is catalogued for boiler water additive (Food Additive); OFF has not matched a U.S. product row yet.