Baby Safety / Compounds / PHMB

Is PHMB safe for babies and kids?

Context-dependent for kids

(Babies-specific data is limited; this page draws from human pregnant context.) Pregnancy alters the metabolism and distribution of PHMB, potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

What is phmb?

The IUPAC name is 1,1'-hexamethylenebis[5-methyl-2-piperidone] or polyhexamethylene biguanide hydrochloride.

Also known as: 1,1'-hexamethylenebis[5-methyl-2-piperidone] or polyhexamethylene biguanide hydrochloride, polyhexamethylene biguanide, PHMB HCl, Cosmocil CQ.

IUPAC name
1,1'-hexamethylenebis[5-methyl-2-piperidone] or polyhexamethylene biguanide hydrochloride
CAS number
32289-58-0
Molecular formula
C7H17N5O2·HCl
Molecular weight
194.67 g/mol
SMILES
C1=CC=C(C(=C1)C(=O)O)NC2=CC=CC=C2C(=O)O
PubChem CID
11371

Risk for babies

Context-dependent

Pregnancy alters the metabolism and distribution of PHMB, 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.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters the metabolism and distribution of PHMB, 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

2 regulatory and scientific bodies have classified PHMB. The classifications differ — that's the data.

AgencyYearClassificationNotes
EU_CLP—Acute Tox. 4 (Oral); Eye Irrit. 2H302 (Harmful if swallowed), H319 (Causes serious eye irritation)
EU_Cosmetics——Restricted to 0.3% in rinse-off products; listed in INCI Dictionary

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 phmb

  • contact lens solutions
  • wound care
  • oral antiseptics
  • water treatment
  • pool disinfection

Safer alternatives

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

  • Physical preservation methods (UV treatment, filtration, controlled atmosphere)
    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×
  • Naturally-derived antimicrobials (essential oil components at validated concentrations)
    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: 2-5× conventional
  • Hurdle technology combining multiple mild preservation methods
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×

Frequently asked questions

What products contain phmb?

PHMB appears in: contact lens solutions; wound care; oral antiseptics.

See PHMB in the baby app

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

Open in baby View raw API data

Sources (2)
  1. PubChem Compound CID 11371 — database
  2. ATSDR Toxicological Profile — CAS 32289-58-0 — reference

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 →