Body & Beauty / Compounds / Carrageenan

Carrageenan on your skin: a safety profile

Moderate risk

(People-specific data is limited; this page draws from human adult context.) Carrageenan is a family of sulfated polysaccharides extracted from red seaweed (primarily Chondrus crispus, Eucheuma, and Gigartina species) and used extensively as a food-grade thickener, stabilizer, and gelling agent. It is present in dairy products (chocolate milk, ice cream, infant formula), processed meats, deli salads, plant-based milks, and a wide range of processed foods. Carrageenan is distinct from 'degraded carrageenan' (poligeenan; MW <50 kDa), which is a known animal carcinogen and intestinal irritant definitively not permitted in food. The debate over food-grade carrageenan (high-MW, non-degraded) centers on whether small amounts of low-MW degraded carrageenan are present as impurities, and on animal studies using high doses that some researchers argue produced intestinal inflammation and promoted tumor growth. IARC has not classified food-grade carrageenan as a carcinogen. FDA, EFSA, WHO/JECFA, and the Joint FAO/WHO Expert Committee have each reviewed carrageenan's safety and concluded that food-grade carrageenan at current dietary intake levels does not pose a significant health hazard. The National Organic Program (USDA) removed carrageenan from the list of permitted organic substances in 2018, then reversed this decision in 2020 following a public comment process, reinstating it as an allowed organic additive. A minority scientific position — associated primarily with researchers Joanne Tobacman and colleagues — holds that even food-grade carrageenan activates inflammatory pathways (NF-κB, MAPK) at low concentrations, with potential implications for IBD, insulin resistance, and colorectal cancer promotion; this position has not gained consensus regulatory acceptance.

What is carrageenan?

The IUPAC name is zinc;1-(5-cyano-2-pyridinyl)-3-[2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate.

Also known as: zinc;1-(5-cyano-2-pyridinyl)-3-[2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate, FC166779, G72751, Carrageenan, native.

IUPAC name
zinc;1-(5-cyano-2-pyridinyl)-3-[2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate
CAS number
9000-07-1
Molecular formula
C23H23FN4O7Zn
Molecular weight
551.8 g/mol
SMILES
CCC(=O)C1=C(C(=C(C=C1)F)C2CC2NC(=O)NC3=NC=C(C=C3)C#N)O.CC(=O)[O-].CC(=O)[O-].[Zn+2]
PubChem CID
78126884

Risk for people

Moderate risk

Carrageenan is a family of sulfated polysaccharides extracted from red seaweed (primarily Chondrus crispus, Eucheuma, and Gigartina species) and used extensively as a food-grade thickener, stabilizer, and gelling agent. It is present in dairy products (chocolate milk, ice cream, infant formula), processed meats, deli salads, plant-based milks, and a wide range of processed foods. Carrageenan is distinct from 'degraded carrageenan' (poligeenan; MW <50 kDa), which is a known animal carcinogen and intestinal irritant definitively not permitted in food. The debate over food-grade carrageenan (high-MW, non-degraded) centers on whether small amounts of low-MW degraded carrageenan are present as impurities, and on animal studies using high doses that some researchers argue produced intestinal inflammation and promoted tumor growth. IARC has not classified food-grade carrageenan as a carcinogen. FDA, EFSA, WHO/JECFA, and the Joint FAO/WHO Expert Committee have each reviewed carrageenan's safety and concluded that food-grade carrageenan at current dietary intake levels does not pose a significant health hazard. The National Organic Program (USDA) removed carrageenan from the list of permitted organic substances in 2018, then reversed this decision in 2020 following a public comment process, reinstating it as an allowed organic additive. A minority scientific position — associated primarily with researchers Joanne Tobacman and colleagues — holds that even food-grade carrageenan activates inflammatory pathways (NF-κB, MAPK) at low concentrations, with potential implications for IBD, insulin resistance, and colorectal cancer promotion; this position has not gained consensus regulatory acceptance.

Regulatory consensus

1 regulatory bodyhas classified Carrageenan.

AgencyYearClassificationNotes
EPA CTX / IARC—Group 3 - Not classifiable as to its carcinogenicity to humans

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter carrageenan

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles
  • Food — processed food, beverages, candy, baked goods
  • Fragrance — perfume, cologne, scented personal care products, household fragrance products, candles
    Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Carrageenan:

  • Fragrance-free formulations
    Trade-offs: Consumer preference for scented products
    Relative cost: Lower (ingredient elimination)
  • Essential oil-based fragrances (with disclosure)
    Trade-offs: Natural does not mean safe — many essential oils are skin sensitizers
    Relative cost: 2-5× conventional

Frequently asked questions

What products contain carrageenan?

Carrageenan appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); processed food (Food).

See Carrageenan in the body app

Look up products containing carrageenan, compare to alternatives, and explore the full data record.

Open in body View raw API data

Sources (2)
  1. US FDA: Carrageenan — GRAS Status, 21 CFR 172.620, Distinction from Degraded Carrageenan (Poligeenan), USDA NOP Organic Reinstatement (2020), and Dietary Exposure Assessment (2022) (2022) — regulatory
  2. EFSA Panel on Food Additives: Re-evaluation of Carrageenan (E407) and Processed Eucheuma Seaweed (E407a) — Infant Formula Prohibition Recommendation, Adult ADI 'Not Specified,' Inflammation Pathway Assessment, and Degraded Fraction Impurity Concerns (EFSA Journal 2018;16(4):5238) (2018) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →