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Minoxidil

CAS 38304-91-5 · 100/100 · High conf.

Also registered as 1 other CAS number

16317-69-4

Concern score

100/100Critical concern based on regulatory listings.
High confidence

Minoxidil in plain language

What it is

On cosmetic ingredient lists it appears as “Minoxidil hyaluronamide”.

Also known as Minoxidil hyaluronamide · Minoxidil oxothiazolidinecarboxylate · Minoxidil succinoyl DECAPEPTIDE-18 · Minoxidil succinoyl OLIGOPEPTIDE-143 · 2,4-DIAMINO-6-PIPERIDINOPYRIMIDINE 3-OXIDE. · 3-Oxo-6-(piperidin-1-yl)-3lambda~5~-pyrimidine-2,4-diamine

Show all 29 names

2,4-Diamino-6-piperidinopyrimidine 3-N-oxide · 2,4-Diamino-6-piperidinopyrimidine 3-oxide · 2,4-Pyrimidinediamine, 6-(1-Piperidinyl)-, 3-Oxide · 2,6-Diamino-4-(piperidin-1-yl)pyrimidin-1-ium-1-olate · 6-Amino-1,2-dihydro-1-hydroxy-2-imino-4-piperidinopyrimidine · 6-Amino-1,2-dihydro-1-hydroxy-2-imino-4-piperodinopyrimidine · Alopexil · Alostil · Loniten · Lonolox · Minodyl · Minoximen · Mintop · Normoxidil · Pierminox · Prexidil · Pyrimidine, 2,4-diamino-6-piperidino-, 3-oxide · Riup · Rogaine · Theroxidil · Tricoxidil · U-10,858 · U-10858

What it does

Used in cosmetics as a hair conditioner and a hair fixative. Minoxidil is the heterocyclic compound.

  • Hair conditioning
  • Hair fixing
  • Conditioner
  • Hair fixative
Is it a concern?
Critical concern: no hazard classifications on record. It is banned in EU cosmetics.

Why it's flagged

6-(Piperidinyl)-2,4-pyrimidinediamine-3-oxide (Minoxidil (INN)) and its salts is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — banned

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • In marketed US drugs
  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Beauty
  • Pharma
  • Food
  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.

    banned
    View source →
  • EUCosIngActive2 entries
    • Cosmetics Regulation annex II / ref 372.Source →
    • Minoxidil is the heterocyclic compound that conforms to the formula Restriction: II/372Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 5 composition records across product categories including Food and drug, Personal care. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Hair fixative.
    • EPA CPDat observed this chemical in 5 composition records across product categories including Food and drug, Personal care. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Hair fixative.Source →
  • USFDAmarketed drug occurrenceFDA NDC lists this ingredient in 296 active drug products and 311 total products.
    • FDA NDC lists this ingredient in 296 active drug products and 311 total products.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Minoxidil. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Minoxidil yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →
  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2024-11-22

    Open →
  • EPA Chemical and Products Database

    exposure · updated July 2016

    Open →
  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →
  • FDA National Drug Code Directory

    regulatory · updated 2031-03-07

    Open →
  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →
  • openFDA Substance

    registry · updated 2026-05-24

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Food use

Food-use source coverage is present in the current record.

Good fit

The ingredient appears in food-oriented source coverage or allowed-use references, which makes food use easier to support than a context with no domain signal at all.

Fragrance avoidance

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often FDA National Drug Code directory has listed Minoxidil in a product composition. These are source records, not Greenveil catalog products.

Source records

311

Typical roles

Hair conditioningHair fixingConditionerHair fixative
See products using Minoxidil →

Catalog

Found in these products

Cosmetic and personal-care products that list Minoxidil are shown first. Their ingredient lists include Minoxidil; each product's own rating depends on its whole formula, so it is shown on the product page, not here.