Risk assessmentindependent cross-checkfull text checked I-RES-102 standard review
WHO/FAO experts: gentamicin is hardly absorbed when swallowed
JECFA: Gentamicin - toxicological monograph (WHO Food Additives Series 34) and JECFA evaluation summary (ADI 0-0.02 mg/kg bw, latest evaluation 1998)
Overview
Joint FAO/WHO Expert Committee on Food Additives (JECFA). WHO Food Additives Series / INCHEM 1998
Experts set a safe daily intake of 0.02 mg/kg body weight and note that gentamicin is essentially not absorbed from the gut; kidney and ear damage were seen with injected medical doses.
Does the study support the specific claim? No · Methodological quality: high
Plain-language summary
Study explained simply
- What did the researchers want to find out?
What intake of gentamicin residues is safe for consumers?
- How was the study done?
International expert risk assessment of a veterinary drug residue
- How many people, animals or samples were studied?
not applicable
- What was actually found?
Summary (jec_897): ADI 0-0.02 mg/kg bw (latest evaluation 1998); MRLs (mg/kg) muscle and fat (cattle, pigs) 0.1, liver 2, kidney 5, milk 0.2. Monograph (FAS 34): 'Gentamicin, in common with other aminoglycosidic drugs, is poorly absorbed from the gastrointestinal tract'; 'aminoglycosides are essentially not absorbed after oral administration'. Human therapeutic data: about 1.7 mg/kg bw i.v. every 8 hours (5.1 mg/kg bw/day) produced nephrotoxicity in 8 (15%) patients and auditory toxicity in 3 (6%).
- How large was the observed effect?
Summary (jec_897): ADI 0-0.02 mg/kg bw (latest evaluation 1998); MRLs (mg/kg) muscle and fat (cattle, pigs) 0.1, liver 2, kidney 5, milk 0.2. Monograph (FAS 34): 'Gentamicin, in common with other aminoglycosidic drugs, is poorly absorbed from the gastrointestinal tract'; 'aminoglycosides are essentially not absorbed after oral administration'. Human therapeutic data: about 1.7 mg/kg bw i.v. every 8 hours (5.1 mg/kg bw/day) produced nephrotoxicity in 8 (15%) patients and auditory toxicity in 3 (6%).
- What do the results mean in everyday life?
Kidney and hearing damage come from medical injections, not from food traces.
- What are the study's limitations?
Older evaluation; MRLs set for cattle and pigs only
- What does it say about Elawady's specific claim?
Contradicts the health-harm part of the claim.
- Do the results apply to Germany and Europe?
Applies internationally.
- What can explicitly not be concluded from this study?
Does not address illegal very high residues.
Scientific in-depth review
1. Full reference
- Authors
- Joint FAO/WHO Expert Committee on Food Additives (JECFA)
- Journal
- WHO Food Additives Series / INCHEM
- Year
- 1998
- Identifier
- Verification
- verified – WebFetch of INCHEM monograph and evaluation summary (https://inchem.org/documents/jecfa/jeceval/jec_897.htm) 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- full text
- Conflicts of interest and funding
not stated in abstract
2. Research question
What intake of gentamicin residues is safe for consumers?
3. Study design and population
- Study design
- Risk assessment – International expert risk assessment of a veterinary drug residue
- Population
General population
- Country
international
- Period
1995-1998 evaluations
- Sample size
not applicable
- Inclusion and exclusion criteria
as described in the abstract
4. Methods and endpoints
- Exposure / intervention
Gentamicin residues in food
- Comparator
Toxicological and microbiological thresholds
- Endpoints
ADI, MRLs, toxicity
- Statistical methods
as reported in the abstract
5. Actual results
- Results
Summary (jec_897): ADI 0-0.02 mg/kg bw (latest evaluation 1998); MRLs (mg/kg) muscle and fat (cattle, pigs) 0.1, liver 2, kidney 5, milk 0.2. Monograph (FAS 34): 'Gentamicin, in common with other aminoglycosidic drugs, is poorly absorbed from the gastrointestinal tract'; 'aminoglycosides are essentially not absorbed after oral administration'. Human therapeutic data: about 1.7 mg/kg bw i.v. every 8 hours (5.1 mg/kg bw/day) produced nephrotoxicity in 8 (15%) patients and auditory toxicity in 3 (6%).
- Absolute risks
not reported
- Authors' conclusion
Residues below the ADI pose no appreciable risk; the ADI is based on a microbiological end-point.
6. Strengths
- International standard-setting assessment
7. Weaknesses
- Older evaluation
- MRLs set for cattle and pigs only
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- not assessable
- Rationale
Risk assessment.
9. Assessment of the statistical interpretation
Therapeutic i.v. doses are about 8,000 times the worst-case residue intake estimated from I-RES-101.
10. Relevance to the specific claim
Defines safe intake and explains why oral residues differ from injected therapeutic doses.
11. Independent contrary findings
12. Transferability to Germany and Europe
13. Overall methodological judgement
Experts set a safe daily intake of 0.02 mg/kg body weight and note that gentamicin is essentially not absorbed from the gut; kidney and ear damage were seen with injected medical doses.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | high |
| Risk of bias | low |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | unknown |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- Poultry farms inject chicks with gentamicin; consumers then ingest gentamicin with chicken liver, gizzards and meat, which damages kidneys and hearing. – Studies contradicting or limiting the claim