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Diosmin

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What Is Diosmin? Vein Health Science, Chronic Venous Insufficiency & B2B Sourcing Guide (2026)

1. What Is Diosmin and Why Is It the Gold Standard for Vein Health?

Diosmin (地奥司明) is a naturally occurring flavonoid glycoside found primarily in citrus fruits, especially Citrus limon (lemon) and Citrus aurantium (bitter orange). It is the most extensively studied and clinically validated botanical compound for chronic venous insufficiency (CVI) and hemorrhoidal disease.

As the active ingredient in Daflon 500 — one of the world's most prescribed venotonic medications — diosmin has generated billions of dollars in clinical data and is recommended by international vascular surgery guidelines including the American Venous Forum and the European Society for Vascular Surgery.

The global diosmin market is expanding rapidly, driven by an aging population, increasing prevalence of venous disorders, and growing consumer preference for natural vein health supplements over synthetic pharmaceuticals.

Greensky Bio supplies premium diosmin sourced from natural citrus flavonoids, produced to pharmaceutical-grade specifications.

2. What Are the Key Mechanisms of Action of Diosmin?

2.1 Venotonic Effect: Strengthening Vein Wall Integrity

Diosmin enhances venous tone by increasing the responsiveness of venous smooth muscle to norepinephrine. It achieves this by:

• Inhibiting the breakdown of norepinephrine through reduced catechol-O-methyltransferase (COMT) activity

• Prolonging the vasoconstrictive effect of endogenous catecholamines on vein walls

• Reducing venous capacitance and distensibility, improving venous return

2.2 Microcirculatory Protection

Diosmin protects capillary beds through multiple pathways:

• Anti-inflammatory: Inhibits leukocyte activation, adhesion, and migration — key drivers of venous inflammation and microvascular damage

• Antioxidant: Scavenges free radicals and reduces lipid peroxidation in the microvasculature

• Anti-edema: Reduces capillary permeability and fluid extravasation, decreasing leg swelling and heaviness

2.3 Lymphatic Support

Diosmin increases lymphatic contraction frequency and intensity, enhancing lymphatic drainage and reducing interstitial fluid accumulation — a critical benefit for patients with venous-lymphatic insufficiency.

2.4 Standard Specifications

3. What Conditions Does Diosmin Treat?

3.1 Chronic Venous Insufficiency (CVI)

CVI affects an estimated 20–40% of adults in developed countries, presenting as leg heaviness, pain, swelling, cramps, and restless legs. Diosmin is the first-line conservative treatment:

• Clinical evidence: Meta-analyses of randomized controlled trials confirm that diosmin (1,000 mg/day) significantly reduces leg pain, heaviness, and edema compared to placebo

• CEAP classification: Effective across CEAP stages C1–C4 (from spider veins to venous ulcers)

• Combination therapy: Typically formulated with Hesperidin (a synergistic flavonoid) at a 9:1 ratio (diosmin:Hesperidin), mirroring the Daflon 500 formulation

3.2 Hemorrhoidal Disease

Diosmin is widely used for both acute hemorrhoidal attacks and chronic hemorrhoidal management:

• Acute attacks: High-dose protocol (3,000 mg/day for 4 days, then 2,000 mg/day for 3 days) significantly reduces bleeding, pain, and discharge

• Maintenance: 1,000 mg/day prevents recurrence and reduces symptom severity

• Peri-surgical: Reduces post-hemorrhoidectomy pain and bleeding when started before surgery

3.3 Venous Ulcer Adjunct Therapy

When combined with compression therapy, diosmin has been shown to accelerate venous ulcer healing rates and reduce ulcer recurrence.

4. What Are the Main Applications of Diosmin?

4.1 Pharmaceutical Formulations

• Tablets: Micronized diosmin 450 mg + Hesperidin 50 mg (Daflon 500 equivalent)

• Capsules: Standalone diosmin formulations at 300 mg, 500 mg, and 600 mg

• Topical: Diosmin-containing creams and gels for localized venous support

4.2 Dietary Supplements

• Vein health and circulation support formulas

• Combination products with horse chestnut (aescin), butcher's broom (ruscogenins), and grape seed extract (OPCs)

• Sports recovery supplements targeting exercise-induced leg swelling

4.3 Cosmeceuticals

• Anti-dark circle eye creams (diosmin strengthens periorbital capillaries)

• Anti-cellulite and body firming formulations

• Post-procedure skincare (post-laser, post-peel vascular support)

5. How to Source Premium Diosmin: A Buyer's Guide

5.1 Natural vs. Synthetic Diosmin

5.2 Particle Size and Bioavailability

The bioavailability of diosmin is highly dependent on particle size. Micronized diosmin (D90 < 10 μm) demonstrates significantly higher absorption compared to non-micronized forms. Look for suppliers with validated micronization processes.

5.3 Quality Certifications

• ✅ Pharmacopoeia compliance: EP (European Pharmacopoeia), USP, ChP monographs

• ✅ ISO22000 / HACCP — Food safety management

• ✅ BRCGS — Global food safety standard

• ✅ HPLC-verified COA — Per-batch potency confirmation

• ✅ Halal / Kosher — Broader market access

6. About Greensky Bio: Certified Plant Extract Manufacturer

Hangzhou Greensky Biological Tech Co., Ltd., established in 2004, is a professional natural plant extract manufacturer with over 20 years of experience in identifying, researching, developing, and producing active herbal ingredients.

Why Source Diosmin from Greensky Bio?

• ✅ Natural citrus-derived diosmin with HPLC-verified potency

• ✅ ISO22000, BRCGS, Ecocert Organic, SGS-GMP certified

• ✅ Independent laboratory with GC, HPLC, UV capabilities

• ✅ Export markets across Europe, the United States, South Korea, and Russia

• ✅ Near $30 million in annual export value (2023)

Contact Greensky Bio for diosmin pricing and samples →

7. Diosmin FAQ

Q: What is the standard clinical dose of diosmin?

For chronic venous insufficiency: 1,000 mg/day (typically 500 mg twice daily). For acute hemorrhoidal attacks: 3,000 mg/day for 4 days, then 2,000 mg/day for 3 days, followed by 1,000 mg/day maintenance.

Q: Why is diosmin often combined with hesperidin?

Hesperidin is a closely related citrus flavonoid that synergistically enhances diosmin's venotonic and capillary-protective effects. The 9:1 ratio (diosmin:hesperidin) used in Daflon 500 is the most clinically studied combination and is recommended by vascular surgery guidelines worldwide.

Q: Is diosmin safe for long-term use?

Yes. Diosmin has an excellent safety profile with over 30 years of clinical use. Mild side effects (gastrointestinal discomfort, headache) are infrequent and typically resolve spontaneously. It is well-tolerated in long-term use for chronic venous insufficiency management.

Q: Can diosmin be used during pregnancy?

While diosmin has been used for hemorrhoidal symptoms during pregnancy in clinical practice, pregnant women should consult their healthcare provider before use. Some studies suggest it is safe during the second and third trimesters, but medical supervision is essential.

Q: Do you offer micronized diosmin?

Yes. We provide micronized diosmin with particle sizes optimized for enhanced bioavailability. Please contact our sales team for technical specifications and sample requests.