Reading an herbal raw material spec sheet is the buyer's only direct window into ingredient quality — and knowing what to look for separates approvable lots from costly rejections. However, most brand owners receive these documents with every shipment, glance at the header, and file them. That is a mistake. In fact, the spec sheet is a contractual statement of identity, potency, and safety. As a result, if it is wrong, your finished product is wrong. This guide walks through every section a buyer should scrutinize before signing off on a lot.
Part of our complete guide to herbal ingredient sourcing and quality.
Key Takeaways
- A spec sheet (also called a CoA — Certificate of Analysis) is the supplier's signed declaration of identity, purity, and potency for one specific lot of herbal raw material
- The identity section must name the species in Latin, the plant part, and the authentication method — common name alone is not acceptable
- Assay or marker-compound results confirm potency; physical parameters (moisture, ash, foreign matter) confirm processing integrity
- Contaminant panels must cover pesticides, heavy metals, microbiology, and mycotoxins to the limits your finished-product spec requires
- Mismatches between the spec sheet and your own approved supplier specification are grounds for rejection — never accept 'close enough'
What an herbal raw material spec sheet actually is
An herbal raw material spec sheet is a lot-specific document the supplier issues with every shipment. It may be labelled Certificate of Analysis, CoA, or product specification. It states what the material is, how it was tested, and what the results were. Crucially, it is not a marketing document. Furthermore, it is a regulated record, not a brochure. It is a regulated record. Under Health Canada's Good Manufacturing Practices guidance for natural health products, every ingredient lot used in a licensed NHP must have a spec sheet on file, and the receiving manufacturer must verify it against an internal raw material specification before release.
Here is what that means in practice. When you receive a shipment, you check the spec sheet against your own approved supplier specification. If your spec says 1.0% silymarin minimum and the lot tests at 0.8%, you reject the lot. In short, there is no negotiation. The document also forms part of the batch record for any finished product made from that lot. Investigators reviewing a complaint or recall will trace back through the spec sheet first.
Most buyers conflate the spec sheet with the supplier's product brochure. The brochure describes the product in general; the spec sheet describes one specific lot. Always look for a lot number, manufacturing date, and signature or analyst initials. In other words, a spec sheet without a lot number is not a spec sheet — it is marketing.
Identity: the section every herbal raw material spec sheet must get right
Identity is the first thing to verify on an herbal raw material spec sheet, and the first place suppliers cut corners. In short, what to look for on the identity line of an herbal raw material spec sheet is botanical proof, not a label restatement. A compliant identity section must include the full Latin binomial, the plant part used, the country of origin, and the authentication method. "Echinacea" is not enough. "Echinacea purpurea, aerial parts, USA, authenticated by HPTLC" is enough.
The authentication method matters more than buyers usually realize. Accepted methods include HPTLC, DNA barcoding, and macroscopic or microscopic botanical examination by a qualified analyst. Organoleptic testing alone is not sufficient for any species with a known adulterant. For example: Echinacea purpurea root substituted with E. angustifolia. Hydrastis canadensis substituted with Coptis chinensis. Eleutherococcus senticosus substituted with Periploca sepium.
Worth understanding before you proceed: if the spec sheet lists only the common name, or names a method like "visual inspection," raise it with the supplier. For high-risk species, request the underlying HPTLC chromatogram or DNA report. A reputable supplier will send it. One who refuses is telling you something.
Finally, check the plant part. Rhodiola rosea root is the medicinal part; aerial parts are not. Withania somnifera root is the medicinal part. Leaf is a different ingredient with different regulatory status in Canada. The spec sheet must say which part, and your specification must match.
Assay, markers, and physical parameters
After identity, the spec sheet moves to potency and physical condition. This is where buyers learn whether the herbal raw material will perform in the finished product. The relevant assay depends on the species: silymarin for milk thistle, withanolides for ashwagandha, salidroside and rosavins for rhodiola, hypericin or hyperforin for St. John's wort. Your specification should name the marker compound, the test method (typically HPLC), and the minimum acceptable percentage. As a result, what to look for in the assay block of any herbal raw material spec sheet is a numeric result tied to a defined method.
Here is how we handle it: at receiving, every assay result is checked against the internal raw material spec. If the lot meets or exceeds the minimum, it moves to the next check. If it is below, the lot is quarantined and the supplier is notified. There is no path forward without an in-spec result.
Additionally, physical parameters appear next. Look for moisture content, typically 12% maximum for dried herbs. Check total ash and acid-insoluble ash for process integrity. Note foreign organic matter such as weeds, and foreign inorganic matter such as sand or stones. Each has a numeric limit on a well-built spec sheet. Particle size or mesh appears for powders and granulated material. Finally, bulk density appears for tincture and tea applications where fill volume matters.
The practical implication: a lot can pass identity and still fail on moisture or foreign matter. High moisture content invites microbial growth in storage. It also shifts the herb-to-solvent ratio in tincture extraction. Foreign matter is a finished-product complaint waiting to happen.
Contaminants: residues, heavy metals, microbiology, mycotoxins
The contaminant panel is the longest section on a well-built herbal raw material spec sheet, and the section most likely to surface a rejection. Specifically, four panels matter:
The short version: every contaminant on your specification needs a corresponding numeric result on the spec sheet. "Pass" is not a result. "<0.05 ppm" is a result. If the document gives you the former, request the underlying lab report.
Red flags: when to reject a lot
Once you know what an herbal raw material spec sheet should look like, the red flags become obvious. Therefore, reject decisively rather than negotiating. Reject any lot whose spec sheet shows the following:
Here is what most buyers miss: rejection is not adversarial. On the contrary, it is the entire point of the receiving process. For example, a supplier who responds to a rejection by replacing the lot quickly and sending corrected paperwork is a supplier worth keeping. One who pushes back, delays, or insists the rejected lot is "close enough" is telling you what every future shipment will look like.
At Perfect Herbs we operate to GMP-compliant standards under our Health Canada site licence. The spec sheet review is the single most important check in receiving. If you are building a brand and want to understand how this fits into the broader sourcing model, see herbal ingredient sourcing in Canada and supplier qualification and traceability. For brand owners exploring private label, our manufacturing services include full receiving QC on every lot — request a quote to discuss your formulation.
Published: May 15, 2026