Baby Safety / Compounds / Disodium inosinate (IMP; E631)

Is Disodium inosinate (IMP; E631) safe for babies and kids?

Moderate risk for kids

Infants are more vulnerable to Disodium inosinate (IMP; E631) 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 disodium inosinate (imp; e631)?

The IUPAC name is disodium;[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1H-purin-9-yl)oxolan-2-yl]methyl phosphate.

Also known as: disodium;[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1H-purin-9-yl)oxolan-2-yl]methyl phosphate, Disodium 5'-inosinate, Disodium inosinate, Sodium inosinate.

IUPAC name
disodium;[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1H-purin-9-yl)oxolan-2-yl]methyl phosphate
CAS number
4691-65-0
Molecular formula
C10H11N4Na2O8P
Molecular weight
392.17 g/mol
SMILES
C1=NC2=C(C(=O)N1)N=CN2C3C(C(C(O3)COP(=O)([O-])[O-])O)O.[Na+].[Na+]
PubChem CID
135414245

Risk for babies

Moderate risk

Infants are more vulnerable to Disodium inosinate (IMP; E631) 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.

What to do: 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.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters the metabolism and distribution of Disodium inosinate (IMP; E631), 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.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

3 regulatory and scientific bodies have classified Disodium inosinate (IMP; E631). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2017Not evaluated by IARC for carcinogenicity — Disodium inosinate (IMP; disodium 5'-inosinate; E631; CAS 4691-65-0; the disodium salt of inosine 5'-monophosphate, a purine ribonucleotide) is a flavor enhancer used synergistically with MSG or with naturally occurring glutamate to amplify umami taste; FDA GRAS; EU E631; EFSA and JECFA ADI 'not specified'; no IARC, EPA, or EFSA carcinogenicity classification; IMP is a normal cellular metabolite (an intermediate in purine synthesis and degradation); the primary dietary consideration for nucleotide flavor enhancers is their metabolism to uric acid via xanthine oxidase — persons with gout or hyperuricemia may need to moderate intake of purine-rich foods and nucleotide additives; IMP and GMP (E627) are almost always used together as I+G (inosinate + guanylate mixture) and virtually always combined with MSG, never alone
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)

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 disodium inosinate (imp; e631)

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Disodium inosinate (IMP; E631):

  • 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

Is disodium inosinate (imp; e631) safe for kids?

Infants are more vulnerable to Disodium inosinate (IMP; E631) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What products contain disodium inosinate (imp; e631)?

Disodium inosinate (IMP; E631) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to disodium inosinate (imp; e631)?

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 disodium inosinate (imp; e631)?

Disodium inosinate (IMP; E631) has been classified by 3 agencies including IARC, EPA CTX / Genetox, EPA CTX / Genetox, 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 Disodium inosinate (IMP; E631) in the baby app

Look up products containing disodium inosinate (imp; e631), compare to alternatives, and explore the full data record.

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Sources (1)
  1. Disodium Inosinate IMP E631 CAS 4691-65-0 5'-IMP C10H11N4Na2O8P; FDA GRAS EU E631 EFSA ADI Not Specified; T1R1 Positive Allosteric Modulation Umami Synergy IMP+GMP 5x Amplification 0.02% I+G = 0.1% MSG; Purine Metabolic Pathway HPRT Hypoxanthine IMP AMP GMP AMP Deaminase Purine Nucleotide Cycle Muscle; Xanthine Oxidase Uric Acid Hyperuricemia Gout MSU Crystals First Metatarsophalangeal; Urate Solubility 68mg/L 7mg/dL; Gout Patients Moderate Nucleotide Additives Organ Meats Sardines Anchovies Beer; Commercial: Bacillus Subtilis Fermentation Yeast RNA Enzymatic Hydrolysis; Beef 180mg/100g Tuna 285mg/100g Natural IMP; I+G Bouillon Cubes Instant Noodles Snack Seasonings; 5'-Nucleotides Breast Milk Neonatal Gut Development (2017) — 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 →