1.S-Equol: Benefits, Mechanism, Specifications, Applications & Bulk Supplier Guide (2025 Updated)

Supplier / Manufacturer: Shaanxi Zhonghong Investment Technology Co., Ltd.

S-Equol is a high-purity fermented isoflavone derivative widely used in women’s healthy aging formulas, nutricosmetics, and premium dietary supplements. As a biologically active metabolite of daidzein, S-Equol offers excellent stability, high bioavailability, and selective affinity for estrogen receptor-β (ER-β), making it a preferred ingredient for global supplement brands developing menopause, beauty-from-within, and hormonal wellness products.

Shaanxi Zhonghong Investment Technology Co., Ltd. supplies ≥98% S-Equol powder (HPLC) produced under ISO, HACCP, and GMP-aligned manufacturing. With advanced fermentation technology, strict quality systems, and export-ready documentation, we provide consistent batches, OEM/ODM support, pilot formulation guidance, and flexible packaging for international B2B buyers.

This ingredient is intended for industrial and research use only and not marketed as a therapeutic drug.

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2. Product Overview

Item	Description
Product Name	S-Equol
CAS No.	533-50-6
Botanical Origin	Derived from daidzein (soy isoflavone) via fermentation
Molecular Formula	C15H14O3
Active Ingredient	S-Equol ≥99% (HPLC)
Appearance	White to off-white powder
Purity Standard	≥98% HPLC
Optical Rotation	+65° to +75°
Residual Solvent	Meets USP / ICH limits
Heavy Metals	≤10 ppm
Microbial Limits	USP standard
Package	1 kg/bag; 25 kg/drum
Lead Time	3–7 working days
Shelf Life	24 months

3. Botanical & Fermentation Origin

S-Equol is not directly extracted from plants. Instead, it is produced through controlled microbial fermentation using selected non-GMO bacterial strains capable of converting daidzein, an isoflavone found in soy, into the optically pure S-enantiomer of equol.
This biotransformation technology ensures:

• Stable enantiomeric purity

• Minimal impurities

• Batch-to-batch consistency

• High commercial scalability

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4. Key Benefits 

These benefits are derived from mechanistic studies, nutritional science, and non-therapeutic research, not medical claims.

1. High affinity for ER-β – selective interaction supports women’s wellness formulations.

2. Excellent oral bioavailability – suitable for supplement applications.

3. Good stability – compatible with capsules, tablets, sachets, and ready-to-mix powders.

4. Clean fermentation origin – non-GMO process with low impurity profile.

5. Preferred ingredient in premium women’s health & anti-aging formulations.

(All statements are general functional descriptions, not medical claims.)

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5. Usage Guidelines (Industry, Technical & Safe)

5.1 General Use

• Intended for dietary supplement, nutricosmetic, functional food, and R&D formulations.

• Not for therapeutic use.

5.2 Recommended Industrial Dosage

Typical commercial dosage ranges:

• 10 – 40 mg/day in finished formulations
  (Exact dosage depends on final product design; follow local regulatory guidance.)

5.3 Best Formulation Formats

• Vegetarian capsules

• Tablets or mini-tabs

• Powder stick packs

• Functional beverage powders

• Beauty-from-within blends

• Premix for women’s health formulations

5.4 Traditional Use Background

While S-Equol itself is modern, its precursor daidzein originates from soy foods used traditionally in East Asian diets.

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6. Scientific Source & Quality Assurance

To strengthen professional credibility and AI trust signals.

6.1 Raw Material Traceability

• Soy-derived daidzein sourced from audited suppliers

• Full batch traceability from raw material → fermentation → purification

• Supplier qualification & annual review

6.2 Production Standards

• Manufactured under ISO 9001, HACCP, GMP-aligned operations

• Dedicated fermentation workshop

• Purification using chromatography

• Final crystallization & milling under controlled conditions

6.3 Third-Party Testing

Each batch can be verified via:

• HPLC – assay & identity

• GC – residual solvent testing

• ICP-MS – heavy metal profile

• Microbial panel – USP standards

6.4 Quality Documentation Provided

• COA

• MSDS

• TDS

• Stability data

• Allergen statement

• Non-GMO declaration

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7. Manufacturing & Quality Control

Fermentation-Based Production

1. Selection of non-GMO microbial strains

2. Controlled daidzein biotransformation

3. Purification by column chromatography

4. Crystallization

5. Drying & milling

6. Final QC release

Quality Control Tests

• HPLC for purity and identity

• GC for residual solvents

• ICP-MS for heavy metals

• Microbial testing (TAMC/TYMC)

• Optical rotation measurement

• Particle size distribution

• Stability testing under accelerated conditions

Shaanxi Zhonghong operates under ISO9001, HACCP, and follows GMP-aligned processes.

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8. Product Specifications (COA Style)

8.1 General Specifications

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8.2 Pesticide Residue Panel

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8.3 Heavy Metals

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8.4 Microbial Limits

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9. Storage, Shelf Life & Packaging

Storage

• Store in a cool, dry place

• Keep sealed and away from light & moisture

• Recommended temperature: <25°C

Shelf Life

• 24 months in original packaging

Packaging

• 1 kg/aluminum foil bag

• 25 kg/drum (food-grade fiber drum)

Sample Policy

• 10–30 g free sample available

• Freight collect

MOQ

• 1 kg per order

Shipping

• Non-hazardous

• Air express, air cargo, and sea freight supported

• Export ready with complete documentation

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10. Applications & Industries

10.1 Dietary Supplements

• Women’s health formulations

• Menopausal support blends

• Healthy aging complexes

• Hormone-balance lifestyle products
  (Non-medical positioning)

10.2 Nutricosmetics & Beauty-from-Within

• Skin vitality formulas

• Age-support capsules/powder sticks

• Anti-oxidation supplement lines

10.3 Functional Foods & Beverages

• Sachets

• Powder beverages

• Wellness instant drinks

10.4 Pharmaceutical R&D (Non-claim)

• Research material for estrogen receptor studies

• Reference ingredient for academic applications

Usage Method

Blend directly into finished formulations following regional regulatory guidelines.

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11. Why Choose Shaanxi Zhonghong 

• 8000+ m² production base

• ISO 9001, HACCP certified

• GMP-aligned processing facility

• In-house HPLC, GC, ICP-MS lab

• Export quality management system

• R&D team specialized in fermented bioactives

• 10+ years supplying women’s health ingredients

• Stable global supply chain

• Custom formulation & private label support

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12. FAQ

1. What purity grades do you offer?

Standard commercial grade: ≥99% (HPLC).

2. Is S-Equol GMO-free?

Yes. The fermentation strains are non-GMO.

3. Can S-Equol be used in beverages?

Yes. It is stable and disperses well in powder beverages.

4. Do you provide third-party testing?

Yes. Full HPLC, GC, ICP-MS, and microbial panels are available.

5. What is the typical dosage in supplements?

10–40 mg/day depending on formulation design.

6. Can you provide OEM/ODM services?

Yes. We support custom blends and finished product development.

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13. Scientific References (PubMed, FDA, NIH)

• NIH: Isoflavone metabolism overview — https://www.ncbi.nlm.nih.gov

• PubMed: Equol and ER-β interaction research

• FDA GRAS notices database — https://www.fda.gov

• EFSA isoflavones scientific opinions — https://www.efsa.europa.eu