How to Choose a Cycloastragenol Supplier: A Practical Checklist for Buyers
Cycloastragenol (CAG) occupies an unusual corner of the botanical extract market: demand is driven by high-value longevity and healthy-aging products, yet the ingredient is technically difficult to manufacture and even harder to verify. The result is a market full of listings that look identical on the surface — "98% cycloastragenol, white powder, COA available" — but differ enormously underneath.
This checklist summarizes what matters when qualifying a cycloastragenol supplier, in rough order of importance.
1. The CAS Number: 78574-94-4 vs 84605-18-5
Before you ask anything else, check which CAS number a supplier actually offers — they refer to different compounds:
- CAS 78574-94-4 is cycloastragenol, the direct hydrolysis product of astragaloside IV — the molecule used in the telomerase research and the one most reagent catalogues list under the cycloastragenol name.
- CAS 84605-18-5 refers to a related but structurally different compound that is not the direct hydrolysis product of astragaloside IV.
Chengdu King-tiger supplies cycloastragenol under CAS 78574-94-4, with structure confirmed by NMR and authorized third-party testing laboratory (Intertek USA). If a supplier refuses to disclose which CAS they are shipping, treat it as a red flag. For the full structural background — how each CAS number relates to astragaloside IV hydrolysis, and how the two structures differ — read our dedicated article: Cycloastragenol CAS Number: 78574-94-4 vs 84605-18-5.
2. Why a Professional Supplier Asks About Your Country and Application
When you contact a serious manufacturer, the first questions will not be about price — they will be about your destination country and your intended application. This is not small talk; it is regulatory due diligence, and it protects you as much as the supplier.
Every country has its own regulatory requirements for imported botanical ingredients. A professional supplier asks about your market and application so it can confirm — before your order is produced — that the material will comply with the regulations of your local market, and recommend the right specification from the start. No surprises at customs, no failed finished-product testing, no unusable stock.
3. Can They Prove the Purity — With the Method, Not Just the Number?
This is the single most important technical check when you buy cycloastragenol, because of the astragenol problem: ordinary HPLC methods cannot separate cycloastragenol from its open-ring by-product astragenol, so contaminated material passes as "98%."
We have tested this directly: a commercial "98% CAG" with a COA of 98.74% contained only 60.45% true cycloastragenol by a method that separates the two. Ask every supplier:
- Which detection method do you use? (Correct answer: HPLC-ELSD or HPLC-RID; CAG has weak UV absorption.)
- Ask if their method can differentiate cycloastragenol and astragenol.
- Provide NMR spectra for the 98% grade as independent structural confirmation.
- Provide a third-party test report — ours come from Intertek (USA), an authorized independent laboratory.
4. Do They Offer the Full Specification Range?
A professional manufacturer serves multiple applications and will offer the whole range:
| Grade | Appearance | Typical Use |
|---|---|---|
| 1% / 5% / 10% | Brown-yellow powder | Whole-herb formulations, blends |
| 50% / 90% | Light yellow powder | Standardized extracts, capsules |
| 98% | Pure white powder (HPLC >99%) | High-dose actives, cosmetics, reference use |
Two further points worth checking:
- What is the "other" fraction? In a good low-purity grade, everything besides CAG is natural Astragalus material — polysaccharides, saponins, flavonoids — not process by-products.
- Stock availability. A manufacturer with running production holds all grades in quantity at any time.
5. Quality System Basics: Heavy Metals, Microbiology, PAHs
Beyond the assay, check the routine quality parameters against sensible limits:
- Heavy metals: arsenic ≤ 1.00 ppm, lead ≤ 1.00 ppm, cadmium ≤ 0.20 ppm, mercury ≤ 0.10 ppm (with low detection limits — ask for the MDL);
- Microbiology: total plate count ≤ 1000 cfu/g, mold & yeast ≤ 100 cfu/g, E. coli and Salmonella negative;
- Physical: loss on drying and ash within specification;
- PAHs: if you sell into the EU, PAHs limits apply to botanical extracts — our Astragalus extract products fully meet the EU requirements, and any supplier you qualify should confirm the same in writing.
6. Documentation and Regulatory Support
For international shipments and finished-product audits, confirm the supplier provides:
- COA with safety indicators such as microbiological parameters, heavy metals, etc.;
- Third-party test reports on request;
- PAHs / regulatory compliance statements;
- Supporting customs documentation;
- Stability and storage guidance (based on long-term stability studies: sealed, protected from light, room temperature — 3-year shelf life).
7. Commercial Signals That Separate Professionals
- They welcome audits and sample testing — encourage you to send their material to Intertek, Eurofins or SGS.
- They publish their evidence — chromatograms, NMR, comparison tests. Ours are on the cycloastragenol product page for anyone to read, including side-by-side chromatograms of market material vs. ours.
- They talk you out of mistakes — a professional will tell you when a lower grade suits your application better than 98%, because they will still be your supplier in five years.
- Track record. King-tiger has specialized in high-purity compounds from traditional Chinese medicine since 2007 — cycloastragenol and astragaloside IV, gardenia genipin. Focus is credibility.
8. Five Questions to Ask Before Requesting a Quotation
If you only have five minutes on a call with a sales representative, ask these five questions. They cover the issues that, if missed, cost the most downstream:
- Which CAS number do you supply? Accept the right 78574-94-4.
- Does your HPLC method separate astragenol from cycloastragenol?
- Is the product verified by an independent third party? Every batch should come with a COA, and the manufacturer should be able to show reports from recognized independent laboratories.
- Can you supply regulatory documentation? PAHs compliance for the EU, and heavy-metal data for the relevant pharmacopoeias.
- Is stock available with consistent batches? For formulation programs, batch consistency and reliable lead times are as important as the purity figure itself.
Please screen suppliers carefully and purchase cycloastragenol from professional manufacturers to avoid quality problems that only appear after formulation — or on a customer's own HPLC.
9. Red Flags — Walk Away When You See These
- COA does not include safety indicators such as microbiological parameters, heavy metals, etc.;
- "98% cycloastragenol" priced dramatically below the credible market range;
- Off-white or yellowish material claimed as 98%;
- Cannot name the raw material origin or the detection method off-hand;
- No third-party verification ever offered, and resistance when you ask;
- Only one grade available, only "whatever is in stock this month."
10. Quick Qualification Checklist (Print This)
| # | Item | Pass |
|---|---|---|
| 1 | Real manufacturer with own process R&D | □ |
| 2 | HPLC-ELSD / HPLC-RID assay method | □ |
| 3 | Could separate astragenol from cycloastragenol | □ |
| 4 | NMR spectra for 98% grade | □ |
| 5 | Third-party report (Intertek / Eurofins / SGS) | □ |
| 6 | Full spec range 1%–99% in stock | □ |
| 7 | Heavy metals + microbiology within limits | □ |
| 8 | EU PAHs compliance in writing | □ |
| 9 | Raw material origin stated (Gansu / Inner Mongolia) | □ |
| 10 | Batch-level COA + customs documentation | □ |
11. Frequently Asked Questions
Q: What is a reasonable minimum order?
Manufacturers with running production typically support small trial orders for qualification and larger contracts thereafter. Ask about sample quantities — a professional supplier will provide samples together with the corresponding batch documentation so you can verify everything independently.
Q: How do I start with King-tiger?
Simple: send us an inquiry through email sales@king-tiger.com. Tell us the grade and quantity you need. We will reply with specifications, the CoA, third-party reports and a quotation — and we encourage you to test our material at any independent laboratory of your choice before you commit.
12. The One-Sentence Summary
Buy cycloastragenol from a manufacturer who can separate astragenol — everything else is negotiable, but that is not.
Chengdu King-tiger Pharm-chem. Tech. Co., Ltd. — professional manufacturer of cycloastragenol (1%–99%), astragaloside IV, astragalus polysaccharides and other high-purity natural compounds since 2007. Related reading: What Is Cycloastragenol? A Complete Guide and Astragenol vs Cycloastragenol.