Is Zeranol (Ralgro) safe for babies and kids?
High risk for kidsInfants are more vulnerable to Zeranol (Ralgro) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.
What is zeranol (ralgro)?
The IUPAC name is (4S,8R)-8,16,18-trihydroxy-4-methyl-3-oxabicyclo[12.4.0]octadeca-1(14),15,17-trien-2-one.
Also known as: ZERANOL, Zearalanol, alpha-Zearalanol, Ralabol.
- IUPAC name
- (4S,8R)-8,16,18-trihydroxy-4-methyl-3-oxabicyclo[12.4.0]octadeca-1(14),15,17-trien-2-one
- CAS number
- 26538-44-3
- Molecular formula
- C18H26O5
- Molecular weight
- 322.4 g/mol
- SMILES
- C[C@@H]1CCCC(=O)CCC/C=C\c2cc(O)cc(O)c2OC1=O
- PubChem CID
- 2999413
Risk for babies
High riskInfants are more vulnerable to Zeranol (Ralgro) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.
Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.
Risk for pregnant and nursing people
Context-dependentPregnancy alters the metabolism and distribution of Zeranol (Ralgro), potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.
No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.
Regulatory consensus
4 regulatory and scientific bodies have classified Zeranol (Ralgro). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| FDA | 1969 | Approved animal growth promoter (NADA 038-233) | |
| EU | 1989 | Banned — Directive 96/22/EC (hormone ban) | |
| Codex Alimentarius | 2015 | ADI 0–0.5 µg/kg bw; MRL established for cattle | |
| IARC | 1993 | Not formally evaluated; structurally related to zearalenone (Group 3) |
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 kids encounter zeranol (ralgro)
- Veterinary Medicine
- Food Contaminant
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Zeranol (Ralgro):
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Non-hormone growth strategies (improved genetics, nutrition)
Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.Relative cost: 1.2-2×
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Ractopamine (beta-agonist — also controversial)
Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.Relative cost: 1.2-2×
Frequently asked questions
Is zeranol (ralgro) safe for kids?
Infants are more vulnerable to Zeranol (Ralgro) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.
What should I do if my child is exposed to zeranol (ralgro)?
Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.
Why do regulators disagree about zeranol (ralgro)?
Zeranol (Ralgro) has been classified by 4 agencies including FDA, EU, Codex Alimentarius, IARC, with differing conclusions. 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. See the regulatory consensus table on this page for the full picture.
See Zeranol (Ralgro) in the baby app
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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 →