Introduction
Minoxidil is the world's most widely used active pharmaceutical ingredient for hair loss treatment. Originally developed as an antihypertensive drug, its remarkable side effect — stimulating hair growth — led to its widespread use in topical formulations for androgenetic alopecia and other hair loss conditions.
For pharmaceutical manufacturers and cosmetic product developers, sourcing high-quality Minoxidil API is critical for producing effective, safe, and compliant hair growth products. This guide provides a comprehensive overview of Minoxidil API specifications, formulation options, quality standards, and procurement best practices.
Quick Facts: Minoxidil (CAS No. 38304-91-5) is available in 2% and 5% topical solution strengths. The global minoxidil market is projected to exceed USD 1.5 billion by 2028, driven by rising awareness of hair loss treatments worldwide.
Chemical Profile & Identification
| Property | Value |
|---|---|
| IUPAC Name | 2,6-diamino-4-piperidin-1-ylpyrimidine 1-oxide |
| CAS Number | 38304-91-5 |
| Molecular Formula | C₉H₁₅N₅O |
| Molecular Weight | 209.25 g/mol |
| Appearance | White to off-white crystalline powder |
| Melting Point | 248°C (decomposition) |
| Solubility | Slightly soluble in water; soluble in propylene glycol and ethanol |
Mechanism of Action
Minoxidil works through several complementary mechanisms to promote hair growth:
- Potassium channel opener: Opens ATP-sensitive potassium channels in smooth muscle cells, leading to vasodilation around hair follicles
- Increased blood flow: Enhanced circulation delivers more oxygen and nutrients to hair follicles
- Anagen phase prolongation: Extends the active growth phase of the hair cycle
- Follicle stimulation: Directly stimulates follicle cell proliferation and differentiation
- Anti-androgen effects: May partially block DHT effects on hair follicles
Quality Standards & Specifications
Minoxidil API must comply with international pharmacopoeial standards for use in registered pharmaceutical products.
| Test Parameter | USP Standard | BP Standard |
|---|---|---|
| Assay (Purity) | ≥98.0% – 102.0% | ≥98.0% – 102.0% |
| Water Content | ≤0.5% | ≤0.5% |
| Residue on Ignition | ≤0.1% | ≤0.1% |
| Heavy Metals | ≤20 ppm | ≤20 ppm |
| Related Substances | Any individual impurity ≤0.1% | Any individual impurity ≤0.1% |
Available Dosage Forms
Topical Solution
- 2% (women)
- 5% (men)
- Propylene glycol base
- Most common form
Topical Foam
- 5% concentration
- Alcohol-free option
- Better compliance
- Faster drying
Oral Tablets
- 2.5mg / 5mg / 10mg
- Systemic hypertension
- Off-label hair use
- Low-dose trending
Market Overview & Applications
Minoxidil API serves a diverse range of market segments:
- Over-the-counter (OTC) hair loss products: The largest application, including brands like Rogaine, Regaine, and numerous generics
- Prescription dermatology: Used in clinical settings for severe alopecia cases
- Oral minoxidil (low-dose): Growing trend for systemic hair loss treatment
- Compounding pharmacies: Custom formulations for individual patients
- Veterinary applications: Used in some animal hair growth studies
Sourcing from China
China is the world's leading producer of Minoxidil API, supplying pharmaceutical manufacturers globally. Key advantages include:
- Competitive pricing with consistent supply
- GMP-certified manufacturing facilities
- COA, MSDS, and regulatory documentation available
- Both small sample and large bulk orders accepted
- Compliance with USP, BP, and EP standards
Storage Requirements: Store Minoxidil API in a cool, dry place at 2–8°C, protected from light and moisture. Shelf life typically 24–36 months when stored properly.
Request Minoxidil API Quotation
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