Understanding the Difference

Minoxidil and Minoxidil Sulfate are both vasodilator compounds used in topical hair growth formulations. While chemically related, they differ significantly in mechanism of action, potency, and formulation requirements. Understanding these differences is critical for formulators selecting the right active ingredient for hair growth products.

Specifications Comparison

パラメータ ミノキシジル 硫酸ミノキシジル
化学名 6-(1-ピペリジニル)-2,4-ピリミジンジアミン 3-オキシド 硫酸ミノキシジルエステル；硫酸ミノキシジル塩
CAS番号 38304-91-5 83701-22-8（硫酸塩）
分子式 C₉H₁₅N₅O C₉H₁₅N₅O₄S
分子量 209.25 g/mol 289.31 g/mol
外観 白色からオフホワイトの結晶性粉末 白色からオフホワイトの粉末
純度（HPLC） ≥ 99.0% 98.01以上TP3T
溶解度 水にはわずかに溶ける（0.2 mg/mL）；アルコール、プロピレングリコールには溶ける 水溶性（ミノキシジルよりも著しく高い）
融点 248～250°C（分解） >200°C（分解）
ストレージ 涼しく、乾燥した、光を遮った場所 涼しく、乾燥しており、吸湿性がある
賞味期限 36ヶ月 24ヶ月

What is Minoxidil?

Minoxidil was originally developed as an oral antihypertensive (vasodilator) medication. Its hair growth-promoting effect was discovered serendipitously when patients experienced hypertrichosis (excessive hair growth) as a side effect. Today, it is the most clinically established topical treatment for androgenetic alopecia (male and female pattern baldness).

FDA-approved concentrations: 2% (women), 5% (men), and 5% foam.

Minoxidil MF

Mechanism of action (prodrug): Minoxidil itself is inactive as a hair growth stimulant. It must be converted by sulfotransferase enzymes (specifically SULT1A1) in the hair follicle to its active metabolite—硫酸ミノキシジル. This conversion is the rate-limiting step for efficacy.

Key limitation: Individual response to Minoxidil depends on endogenous sulfotransferase activity in hair follicles. Approximately 40% of patients are “low responders” due to insufficient enzyme activity.

What is Minoxidil Sulfate?

硫酸ミノキシジル is the active metabolite of Minoxidil. It is the direct-acting form that does not require enzymatic conversion in the hair follicle.

Primary advantage: By supplying the active metabolite directly, Minoxidil Sulfate bypasses the sulfotransferase-dependent activation step, potentially offering:

  • More consistent response across different individuals

  • Faster onset of action (no conversion delay)

  • Potential efficacy in “Minoxidil non-responders” (those with low SULT1A1 activity)

Current regulatory status: Minoxidil Sulfate is not FDA-approved for hair loss treatment. It is available as a research chemical and cosmetic ingredient in some markets. Formulators must verify local regulatory status before product development.

Minoxidil Sulfate MF

Mechanism of Action Comparison

Step Minoxidil (Prodrug) Minoxidil Sulfate (Active)
Activation required Yes (sulfotransferase SULT1A1) No (directly active)
Target ATP-sensitive potassium channels (KATP) ATP-sensitive potassium channels (KATP)
Effect on hair follicle Prolongs anagen (growth) phase; increases follicle size Prolongs anagen (growth) phase; increases follicle size
Vascular effect Vasodilation → increased blood flow to follicle Vasodilation → increased blood flow to follicle
VEGF upregulation はい はい
Onset of action 2–4 months (dependent on conversion) 1–2 months (direct action)

Related Ingredients from LyvBio

Ingredient Primary Benefit 用途
Minoxidil (USP grade) Hair growth, vasodilation Topical solutions, foams
Minoxidil Sulfate (research grade) Active metabolite, direct-acting Research, novel formulations
Finasteride 5-alpha reductase inhibitor Oral hair loss treatment
Dutasteride 5-alpha reductase inhibitor (Type I + II) Oral hair loss treatment
Topical Finasteride Localized DHT inhibition Topical hair loss formulations
Caffeine Adenosine antagonist, follicle stimulation Hair growth shampoos, tonics
Redensyl (Dihydroquercetin-glucoside) Stem cell activation Natural hair growth formulations

供給元：LyvBio株式会社.

リブバイオ株式会社. is global supplier of both Minoxidil and 硫酸ミノキシジル for the pharmaceutical, cosmetic, and research industries. We serve hair growth product manufacturers, contract formulation labs, and R&D institutions globally.

供給能力（両製品とも）：

  • 純度： ミノキシジル ≥99.0%；硫酸ミノキシジル ≥98.0%

  • 月間処理能力： ミノキシジル 1,000+ kg；硫酸ミノキシジル 200+ kg

  • 大量注文： 1000g – 1,000kg

  • リードタイム： 3～5日（サンプル）、10～15日（大量注文）

  • ドキュメント： COA、MSDS、TDS、安定性データ

📧 お問い合わせ： info@lyvbio.com