Can a plant extract supplier provide CoA and stability data for pharmaceuticals?

Short answer: yes. A serious plant extract supplier that serves the pharmaceutical industry should be able to provide a Certificate of Analysis (CoA) for every batch it ships, and should be able to supply stability data that supports the assigned shelf life. If a supplier hesitates on either one, that is a red flag worth investigating before you commit to a purchase order.

For procurement teams and formulators sourcing botanical raw materials for pharmaceutical applications, these two documents are not paperwork for its own sake. They are the evidence that the material you are buying meets its specification, and that it will stay within that specification for the time you plan to store and use it. This article explains what each document should contain, what pharmaceutical buyers should expect, and how to tell a qualified manufacturer from one that is simply reselling powder.

What is a Certificate of Analysis (CoA)?

A CoA is a batch-specific document issued by the manufacturer's quality control laboratory. It records the analytical results for the exact batch you are buying, not a generic description of the product. For a plant extract intended for pharmaceutical use, a complete CoA typically covers:

• Identification: confirmation that the material is the stated botanical and marker compound, usually by HPLC or TLC against a reference standard
• Assay: the measured content of the active or marker compound, reported as a percentage with the analytical method stated
• Physical characteristics: appearance, odor, particle size, and bulk density where relevant
• Loss on drying and ash content
• Heavy metals: lead, arsenic, cadmium, and mercury, typically by ICP-MS
• Pesticide residues: checked against the limits of the target market
• Residual solvents: where extraction solvents are used, reported against ICH Q3C limits
• Microbiological testing: total plate count, yeast and mold, and specified pathogens such as E. coli, Salmonella, and S. aureus

The key point is that the CoA is tied to a batch number and a production date. If the supplier cannot produce a CoA that matches the batch number on the shipping documents, the material has effectively no quality record.

What is stability data, and why does pharmaceutical procurement need it?

Stability data answers a different question: how long does this material stay within specification, and under what conditions? It is generated through controlled studies in which samples of the product are stored under defined temperature and humidity conditions and tested at set intervals.

Two types of studies are standard in the industry:

• Long-term (real-time) studies: samples stored at the intended storage condition, typically 25°C/60% RH or 30°C/65% RH, and tested over the proposed shelf life
• Accelerated studies: samples stored under harsher conditions, typically 40°C/75% RH, and tested over a shorter period, usually six months

Accelerated data is used to support a provisional shelf life while long-term data is being generated, and it also flags how the material behaves under stress, which matters for shipping and warehousing in warm climates. Stability data should also cover packaging, because the container the extract is stored in affects moisture uptake and oxidation.

For pharmaceutical buyers, stability data supports three practical decisions: the shelf life you can assign to the raw material, the retest date you set for incoming goods, and the storage conditions you specify in your own warehouse. Without it, you are guessing.

What a qualified plant extract manufacturer should be able to provide

A manufacturer that runs its own extraction and quality control operations can provide both documents as a matter of routine. The capabilities that make this possible are worth checking before you source:

• An in-house quality control laboratory with HPLC, GC, and other analytical instruments, so assay and impurity testing is done by people who understand the product
• A quality management system aligned with cGMP and GLP principles, so results are recorded, traceable, and auditable
• Batch records that link raw material, production parameters, and finished product testing
• A documented stability program, ideally following ICH-style protocols, so shelf life claims are backed by data rather than habit
• Regulatory certifications that confirm the facility is inspected and approved, such as ISO 9001, USFDA registration, TGA or MEDSAFE listing, and GMP certification

What Plant Extract Wholesale can offer pharmaceutical customers

Plant Extract Wholesale is the English wholesale platform of Hangzhou Green Sky Biotechnology Co., Ltd. (Greenskybio), a plant extract manufacturer with more than 20 years of experience in the industry. Because the company operates its own factories rather than trading third-party goods, it can support pharmaceutical customers with the documentation they need.

Every batch of Greenskybio's extracts is produced under a quality system aligned with cGMP and GLP standards, and the company operates complete quality inspection equipment across its three advanced factories. The production line covers low-temperature extraction, chromatographic separation and purification, and GMP fine drying and packaging workshops, which gives the quality team direct control over the full process.

The company holds ISO 9001, USFDA, TGA, and MEDSAFE certifications, along with Shanghai SGS GMP management system certification and organic product certification. Its 5,000-mu GAP-certified organic planting base supplies raw plant material, and its R&D team of more than 100 researchers supports analytical work and specification development. Beyond the CoA and stability data, Greenskybio also provides value-added services such as certificate of origin, commodity inspection, and compliance certificates to help shipments clear import requirements smoothly.

With more than 200 products in the catalog, including standardized extracts used in pharmaceutical and nutraceutical formulations, the company is positioned to support both one-off qualification samples and ongoing wholesale supply. Buyers looking for plant extracts for pharmaceuticals can review the full range and request batch documentation directly from the manufacturer.

Questions to ask before you place an order

To confirm that a supplier can genuinely provide CoA and stability data, ask these questions directly:

1. Can you provide a CoA for the specific batch number on my order, with assay, heavy metals, pesticide residues, residual solvents, and microbiology results?
2. Can you share an HPLC chromatogram that supports the assay value on the CoA?
3. Do you have stability data for this product? What conditions and time points does it cover, and what shelf life does it support?
4. What is the retest date or expiry date assigned to this batch?
5. Which certifications does your facility hold, and can you share the certificates and their scope?
6. Can you provide a sample for qualification testing before the first production order?

A supplier that answers these questions with documents rather than promises is one you can build a supply relationship on. A supplier that deflects, or offers only a generic product specification sheet, is likely not running the quality operation it claims.

The bottom line

Yes, a plant extract supplier can provide CoA and stability data for pharmaceuticals, provided it is a genuine manufacturer with its own quality control laboratory, a documented stability program, and a quality system that follows cGMP principles. For buyers, the practical task is to verify that the documents are batch-specific, complete, and backed by the facility's certifications. Working with a manufacturer like Greenskybio, which has run its own extraction and testing operations for over two decades, gives pharmaceutical procurement teams the documentation they need to qualify materials with confidence.