It is listed as Low / Limited Concern. Primary concerns include Carcinogen.

Saccharin: Evidence Overview & Uses

Description

Saccharin is a synthetic (non‑nutritive) sweetener (E 954) roughly 200–700 times sweeter than sucrose. It is a calorie‑free sugar substitute used in “diet” sodas, tabletop sweeteners (e.g. Sweet’N Low), and sugar‑free desserts or syrups. Global regulators regard saccharin as safe when consumed within approved limits. For example, the FDA and WHO consider it safe (it has GRAS/food‑additive status) and no warning labels are required. Early high‑dose rat studies linked saccharin to bladder tumors, but experts now agree that mechanism does not apply to humans. Consequently, IARC classifies saccharin (and its salts) as Group 3 (“not classifiable” for human cancer). Typical exposures from diet sodas or foods are far below the acceptable daily intake (ADI) established by regulators.

Learn More Dossier

Saccharin’s chemical name is 1,2-benzisothiazol-3(2H)-one-1,1-dioxide (a benzoic sulfimide) and it carries the E‑number E954 in foods. It is a high‑intensity sweetener (about 300× the sweetness of sugar) but provides no calories. It was one of the first artificial sweeteners (marketed since the early 20th century). In food formulations, saccharin is often blended with other sweeteners to mask bitterness and is stable in acidic or high‑temperature conditions (unlike aspartame). Regulatory status: Saccharin is approved as a food additive by the FDA and many global authorities. The FDA permits saccharin in beverages, desserts, candies, etc., and has set an ADI of 15 mg/kg body weight. In Europe, EFSA’s 2024 re-evaluation confirmed saccharin’s safety and raised the ADI to 9 mg/kg (free saccharin). JECFA (WHO/FAO) maintains a group ADI of 5 mg/kg (as sodium saccharin), and Australia/New Zealand similarly use 0–5 mg/kg. All of these ADIs are well above estimated intakes from foods. In fact, EFSA noted that even the 95th percentile exposure in Europe is below the ADI. In Canada, saccharin was de-listed as a food additive in the 1970s, but Health Canada’s recent review (2017) agrees that saccharin is not carcinogenic to humans and is considering re-approval with an ADI similar to WHO/EU. Use in foods/fast food: Saccharin is common in diet sodas and sugar‑free products. For example, fountain Diet Coke (in many U.S. fast‑food restaurants) contains saccharin in addition to aspartame. It is also found in tabletop sweeteners, chewing gum, gelatin desserts, jams, and sauces. Typical concentrations in diet beverages are on the order of tens of mg per liter – one analysis found ~30 mg/L in a diet cola sample. (By contrast, the FDA ADI of 15 mg/kg would allow a 70 kg adult to safely consume over 600 mg/day.) No fast‑food chain currently bans saccharin in its diet drinks or sugar‑free items. U.S. outlets do not require warning labels, and saccharin has been delisted from California’s Proposition 65 (cancer list) since 2001. Other countries similarly allow saccharin in foods, and new evidence has led many agencies to remove earlier restrictions (e.g. the U.S. National Toxicology Program dropped saccharin from its carcinogen list in 2000). Health evidence: Numerous reviews (FDA, IARC, WHO) agree that human consumption of saccharin poses no known carcinogenic risk at approved levels. Mechanistic studies showed the rat bladder tumor pathway (urine crystallization) is not relevant to humans. Epidemiological studies have not found increased cancer in saccharin consumers. A U.S. cancer institute summary states that saccharin “does not cause cancer… in people”. Current concern centers on metabolic effects: a 2023 WHO guideline noted that non‑nutritive sweeteners (including saccharin) failed to improve long-term weight control and were associated in some studies with higher risk of type 2 diabetes and cardiovascular outcomes. However, WHO judged this evidence inconclusive (confounded by diet/lifestyle factors) and made a conditional recommendation against routine use of any such sweeteners for weight management. In practice, typical fast‑food exposures to saccharin (from a few sodas or sugar-free items per day) are very low relative to ADIs, so well below levels that might pose risk.

Regulatory status

Australia

Restricted FSANZ food standards allow intense sweeteners including saccharin in permitted foods at specified maximum levels. Basis: FSANZ Food Standards Code (intense sweeteners; saccharin INS 954) Source

Canada

Restricted Specified food categories in the List of Permitted Sweeteners; labeling per federal requirements for prepackaged foods. Basis: Health Canada List of Permitted Sweeteners (List 9); Notice of Modification (2017) Source

International

Restricted international food standards General Standard for Food Additives (GSFA) provisions for saccharins. Basis: international food standards STAN 192-1995 (GSFA) — online database entry for additive group 'SACCHARINS' Source

European Union

Restricted Authorization under Regulation (EC) No 1333/2008 (Annex II Union list) and EFSA FAF re-evaluation. Basis: Regulation (EC) No 1333/2008 Annex II; EFSA Journal 2024;22(11):e9044 Source

Japan

Restricted Japan designated additive system (permission based on listing). Basis: Japan Food Sanitation Act designated additives system (see MHLW guidance/pages); designated additives list includes calcium saccharin. Source

United States

Revoked Repeal of 21 U.S.C. §343a and related saccharin warning-label provisions. Basis: Other Effective: 2000-12-21 Source

Registry review date: 2026-03-02

State policy updates

California (US)

Not Applicable AB 418 / HSC §109025 food-additive prohibition list (no saccharin). Effective: 2024-01-01 Compliance: 2027-01-01 Source

US-NY

Provisional Proposed legislation (not enacted). Source

US-WV

Not Applicable HB 2354 unsafe food additive list (no saccharin). Effective: 2025-03-14 Source

Policy timeline

2000-12-21 — Public Law 106-554 repeals saccharin warning-related statutory provisions (21 U.S.C. §343a). (United States)
2001-05-30 — NTP Report on Carcinogens Ninth Edition made available; saccharin removed from the RoC. (United States)
2001-04-06 — OEHHA delists saccharin from Proposition 65 cancer list. (California (US))
2010-12-14 — EPA removes saccharin and its salts from the list of hazardous substances. (United States)
2024-11-15 — EFSA FAF panel re-evaluation updates ADI to 9 mg/kg bw/day (free imide) and notes P95 exposure below ADI. (European Union)
2017-05-04 — Health Canada modifies List of Permitted Sweeteners to enable broader use of saccharin and salts (including tabletop sweeteners). (Canada)

Research Evidence Snapshot

Carcinogenicity concerns from earlier high-dose rat studies have been reinterpreted in light of mechanistic evidence and human epidemiology; major authorities do not classify saccharin as a human carcinogen hazard at dietary exposure levels. Evidence on metabolic and gut microbiome effects is mixed across studies and may depend on dose, background diet, and inter-individual microbiome differences.

Critical endpoints: Cancer (bladder; non-genotoxic mechanism in rats), Genotoxicity (including impurity-driven scenarios), Metabolic/glycemic outcomes (microbiome-mediated hypotheses), Cardiovascular outcomes (limited observational evidence).

ACUTE SENSITIVITY HAZARD

Confidence: Medium

Low

Acute toxicity at dietary levels is not a primary concern in regulatory reviews; rare sensitivity/intolerance is possible but not well quantified in population studies.

CHRONIC HEALTH EVIDENCE DIRECTION

Confidence: Medium

Neutral/unclear

Cancer hazard concerns from older rat studies were resolved by mechanistic and human evidence, but newer research on metabolic and microbiome effects is mixed and not saccharin-specific in many datasets.

EVIDENCE STRENGTH

Confidence: Medium

Moderate

A strong evidence base supports lack of a bladder-cancer association in humans and non-human relevance of the rat bladder tumor mechanism, but evidence for other endpoints (metabolic, microbiome, CVD) remains limited/heterogeneous.

REGULATORY POSTURE (U.S.)

Confidence: High

Authorized/Permitted

Saccharin and listed salts are permitted food additives in the U.S. under 21 CFR 180.37 with limits and labeling requirements.

REGULATORY DIVERGENCE

Confidence: High

Low

Major jurisdictions and international food standards permit saccharin/saccharins with category-specific limits and ADIs; differences mainly reflect ADI values and specification/impurity controls rather than outright bans.

HEALTH-BASED GUIDANCE AVAILABILITY

Confidence: High

Established

Multiple authorities have established ADIs for saccharin (JECFA; EFSA; FDA safe level table).

EXPOSURE CERTAINTY

Confidence: High

Low

For U.S. restaurant/fast-food contexts, ingredient presence and concentrations are often not publicly disclosed; in packaged foods, labeling shows presence but typically not amounts unless required by a specific regulation, limiting exposure quantification.

DATA RECENCY & STABILITY

Confidence: Medium

Stable

Core regulatory conclusions on carcinogenicity are stable (IARC Group 3; NTP delisting; continued authorization), but research on microbiome/metabolic outcomes is evolving and may affect future guidance.

Health guidance & exposure

ADI — JECFA (1993): 5 mg/kg bw/day (group ADI; expressed as saccharin)
ADI — EFSA (2024): 9 mg/kg bw/day (expressed as free imide (saccharin))
ADI — FDA (2025): 15 mg/kg bw/day (FDA 'safe levels' table (consumer-facing))

Agency exposure estimates

FDA — U.S. population: Not specified
EFSA — EU population (refined brand-loyal exposure scenario): Not specified

Measured food levels

FDA (label requirement exists for saccharin-containing products): Not specified

Restaurant/fast-food formulations and beverage syrups are often proprietary; without mandatory public ingredient lists and concentration reporting, exposure estimates are uncertain.

Data gaps

Current (post-2020) U.S. intake distribution for saccharin specifically (mg/kg bw/day) across age groups.
Measured saccharin concentrations in fast-food fountain beverages, coffee/tea sweetener packets, and sugar-free restaurant condiments.
Linkage of biomonitoring markers to specific dietary sources (saccharin vs other non-sugar sweeteners) in U.S. populations.
Up-to-date market penetration estimates for saccharin vs other high-intensity sweeteners in U.S. restaurant supply chains.

Found in these Restaurants

We found this ingredient in menu items at the following chains:

Arby's

3 items ›

Panera Bread

3 items ›

McDonald's

1 items ›

Methodology

We assign the Low / Limited Concern tier using published research, regulatory guidance, and PRūF’s additive taxonomy. Restaurant usage is derived from public ingredient disclosures and mapped to menu items where this additive appears.

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Regulatory context

Learn how this additive is treated across different regulatory frameworks and why mixture effects can matter.

Regulatory frameworks overview Read analysis →

Saccharin

Description

Learn More Dossier

Regulatory status

State policy updates

Policy timeline

Research Evidence Snapshot

Health guidance & exposure

Agency exposure estimates

Measured food levels

Data gaps

Found in these Restaurants

Methodology

Related questions and pages

Regulatory context

Scientific Sources & References

About this Audit

Scan your food for additives of concern