How to evaluate a botanical extract supplier before your first order

Most first orders in this industry fail for a reason that has nothing to do with the quality of the powder: the specification was never written down properly, so nobody can tell whether what arrived is what was agreed.

The evaluation below is therefore not really about factories. It is about whether the person selling to you can turn your requirement into a document that both sides can be held to.

1. Start with the specification, not the price

A quotation that says "Milk Thistle Extract 80%, USD xx/kg" is not a quotation. It is a starting point for a misunderstanding. Before you compare prices between suppliers, get each of them to write down the same list:

• Botanical name and plant part used
• Marker compound(s) and the target figure
• Analytical method for each figure
• Extraction solvent
• Appearance, particle size, loss on drying, ash
• Heavy metal and microbiological limits
• Packing format and net weight

Only once two suppliers are quoting against the same written list is a price comparison meaningful. If a supplier resists putting it in writing, you have learned something useful already.

2. Ask which method produced the assay figure

This one question eliminates more problems than any other.

Take silymarin. A UV-based assay and an HPLC-based assay applied to the same powder will not produce the same number, and UV figures tend to read higher. A supplier quoting "silymarin 80%" without stating the method may be giving you a figure that is technically true under one method and unsupportable under another — and it is your label claim that has to survive scrutiny, not theirs.

The same applies across the portfolio: total flavonoids in ginkgo, polysaccharides in astragalus, rosavins in rhodiola. Every marker compound has more than one way of being measured.

A figure without a method is not data. It is a sales number.

A serious supplier states the method on the COA without being asked. If you have to ask twice, that is a signal.

3. Ask what happens when a batch fails

Every extraction facility eventually produces a batch that misses specification. What separates suppliers is what they do next.

There are three possible answers:

1. It never happens. This answer is not credible, and hearing it tells you the supplier is answering to win the order rather than to inform you.
2. It gets blended or discounted. Out-of-specification material pushed into a shipment at a lower price. Cheap in the short term; the problem lands on your QA desk.
3. It does not ship, and you get a new date. The only answer that protects your product. Ask whether the pre-shipment sample is drawn from the actual production lot — a sample from an older, better lot is a common and damaging practice.

Ask directly and listen to how quickly the answer comes.

4. Demand the document list before you order, not after

Documentation is where a first shipment usually stalls. Goods arrive at the port, and the broker is waiting for a certificate of origin, or your QA department needs an allergen statement that nobody thought to request.

Before you place the order, get the supplier to confirm in writing which of these will be supplied, and in what format:

Document	Why it matters
Certificate of Analysis	Batch specific, not a "typical" COA from an earlier lot
Chromatograms	Lets your lab review integration rather than trusting a figure
MSDS / SDS	Required by carriers and by your own EHS process
Allergen & non-GMO statements	Frequently requested by U.S. retailers and auditors
Certificate of origin	Customs clearance; also relevant to tariff treatment
Pre-shipment sample	Your ability to test before the goods move

If a supplier can produce this list confidently, they have done it many times. If it is assembled for you over several emails with gaps, the shipment will be too.

5. Three questions that separate suppliers

• "Which lot will the pre-shipment sample come from?" — The right answer names the production lot. The wrong answer is vague.
• "Can I see a batch-specific COA, not a typical one?" — A supplier who can only send a specimen COA is not ready to supply against a spec.
• "What is your position on a third-party retest at my cost?" — The answer should be an unqualified yes. A reluctance here is the loudest red flag on this list.

6. Red flags worth taking seriously

• Prices significantly below the market, unexplained
• Assay figures reported without a method
• Reluctance to put a specification in writing
• Pressure to move quickly on a large first order
• A certificate supplied as a blurry photograph rather than a document
• Evasiveness about who actually produces the material

None of these are proof of a problem on their own. Together, two or three of them means you should look elsewhere, even if the price is better.

7. Start with a sample, and test it yourself

The cheapest insurance in this business is a paid sample that you analyse with your own laboratory. It costs a few hundred dollars including freight, and it converts a supplier's claims into your own data.

Ask for a sample drawn from a production lot, with the matching test data attached, so you are comparing like with like. If the sample is taken from a small hand-prepared batch rather than a production run, you are testing the sales process, not the manufacturing one.

The short version

A supplier worth a first order will do four things without prompting: write your specification down, state the analytical method, name the lot the sample came from, and list the documents that will ship with the goods. Everything else — price, lead time, packaging — can be negotiated once those four are in place.

If you are currently comparing quotations and something does not add up, we are happy to look at them with you. We would rather explain what a number means than win an order that goes wrong later.