If you buy kratom, the Certificate of Analysis is the one document that tells you what’s really in the package — not what the label claims, but what a lab measured. It should list alkaloid levels, heavy metal residues, microbial counts, and pathogen screening results for that specific batch. The problem is that a COA is only useful if you know what you’re looking at. A slick PDF with a lab logo but no lot number, no accreditation, and no heavy metals data tells you nothing at all.
This guide breaks down every part of a kratom COA — what the numbers should look like, which omissions should worry you, and why testing became non-negotiable in this market in the first place.
A legitimate kratom COA is tied to one specific production lot, issued by an independent lab accredited to ISO/IEC 17025, and covers four areas at minimum: alkaloid content (mitragynine and 7-hydroxymitragynine, measured by HPLC or LC-MS), heavy metals via ICP-MS (arsenic, cadmium, lead, mercury), a microbial panel (plate count, yeast/mold, coliforms, E. coli), and a Salmonella screen. If any of those four are missing, if there’s no lot number, or if the sample is more than a year old, treat the document with suspicion.
What Is a Kratom Certificate of Analysis?
A Certificate of Analysis is a lab report covering the test results for one specific production lot. Every legitimate COA carries a lot number that matches the label on the product itself — so you can confirm the paperwork actually describes what’s in your hands, not some average batch tested a year or two ago.
That word “specific” matters. Some vendors publish a single “representative” COA and reuse it across every SKU and every shipment for months or years. That’s a misuse of the document. Kratom is a plant, and its alkaloid content and microbial baseline shift naturally between harvests, suppliers, and even different drying runs from the same farm. A COA not tied to your actual batch isn’t really a COA — it’s a marketing prop.
At minimum, a real COA should show:
- A lot or batch number matching the product label
- Sample receipt and test completion dates
- The lab’s name, address, and accreditation number (look for ISO/IEC 17025:2017)
- Alkaloid quantification, at least mitragynine and 7-hydroxymitragynine
- A heavy metal panel: arsenic, cadmium, lead, mercury
- A microbial screen: total plate count, yeast, mold, coliforms, E. coli
- A pathogen test for Salmonella
- Numeric results or clear pass/fail values against stated limits for every analyte
What Does a Kratom COA Actually Test For?
Kratom COAs generally split into four testing categories, each using a different analytical method. Knowing which method belongs to which panel helps you judge whether a lab is doing the work properly.
| Test Category | Typical Method | What It Measures |
|---|---|---|
| Alkaloid quantification | HPLC-DAD, HPLC-UV, or LC-MS/MS | Mitragynine, 7-hydroxymitragynine, minor alkaloids (% by dry weight) |
| Heavy metals | ICP-MS | Arsenic, cadmium, lead, mercury (ppm or µg/day exposure) |
| Microbial screen | USP <61> / FDA BAM plate counts | Aerobic plate count, yeast, mold, coliforms, E. coli |
| Pathogens | USP <62> / AOAC 2013.01 / PCR | Salmonella (required); sometimes Listeria, Staph aureus |
A COA missing any of these four is incomplete. In practice, the two panels most often left out are heavy metals — flagged as a widespread problem in a 2018 FDA surveillance sweep of kratom products — and pathogen testing, which became essential after a multi-state Salmonella outbreak tied to kratom in 2017–2018.
How to Read the Alkaloid Profile
The alkaloid section usually sits at the top of the report. It shows how much mitragynine and 7-hydroxymitragynine are present by weight, along with the minor alkaloid fingerprint. Mitragynine is the dominant compound in the plant; 7-hydroxymitragynine occurs naturally in tiny amounts (typically under 0.02%) and is also the metabolite your liver produces after mitragynine is processed.
For plain dried leaf powder, here’s the range you’d expect to see:
| Compound | Normal Range (dry weight) | Red Flag |
|---|---|---|
| Mitragynine | 1.0%–2.0% | Below 0.8% (diluted) or above 3% (likely enhanced) |
| 7-Hydroxymitragynine | Not detected–0.02% | Above 0.1% in plain leaf |
| Speciogynine, speciociliatine, paynantheine | Present, in proportion to mitragynine | Absent (suggests an isolate rather than whole leaf) |
| Extract products | Varies by concentration | Per-serving MIT content not disclosed |
A widely cited 2016 study tested commercial kratom products purchased from retail and online sellers and found that some contained 7-hydroxymitragynine at levels far above what fresh dried leaf naturally produces — a pattern consistent with deliberate enhancement after harvest. That’s why a plain-leaf COA showing 7-HMG above roughly 0.1% deserves a second look.
What Heavy Metal Limits Should a COA Show?
Kratom absorbs metals from the soil it grows in, and growing regions across Southeast Asia vary widely in soil composition. Lead and arsenic are the main concerns. In 2018, FDA testing of kratom products sold in the U.S. found elevated heavy metal levels in a notable share of samples, which led to public safety communications.
The reference thresholds come from a few overlapping standards, most commonly USP <232> (elemental impurity limits for dietary supplements) and California’s Prop 65 exposure limits:
| Metal | USP <232> Daily Limit (oral) | Prop 65 Daily Limit |
|---|---|---|
| Arsenic (inorganic) | 15 µg/day | 10 µg/day |
| Cadmium | 5 µg/day | 4.1 µg/day |
| Lead | 5 µg/day | 0.5 µg/day |
| Mercury (inorganic) | 30 µg/day | 0.3 µg/day (methylmercury) |
A trustworthy COA reports either a ppm concentration or a calculated daily exposure figure based on a standard serving. If there’s no heavy metals panel at all, or just a bare pass/fail with no numbers, you have no way to check the product against these limits.
Microbial and Pathogen Testing
Kratom is a dried plant product that goes through harvesting, fermentation, drying, and packaging — often in tropical conditions. Without careful sanitation at each step, contamination risk builds up. The clearest example of why this matters is the 2017–2018 multi-state Salmonella outbreak tied to kratom, which sickened well over 100 people across dozens of states.
A complete microbial section should include:
- Total Aerobic Plate Count — overall bacterial load; typical supplement spec is under 10,000 CFU/g
- Total Yeast and Mold Count — typically under 1,000 CFU/g
- Coliforms — a sanitation indicator; typically under 100 CFU/g
- E. coli — should read negative or not detected
- Salmonella — should read “not detected” or “negative in 25g”
Some labs also test for Staphylococcus aureus and Listeria as part of a standard panel. The single line worth scanning for first is the Salmonella result.
The Biggest Red Flags on a Kratom COA
A handful of warning signs show up again and again when reviewing COAs from different suppliers:
- No lot number, or one that doesn’t match the product label. This is the single most important thing to check. A generic “representative sample” isn’t lot-specific testing.
- No accreditation number. A real lab lists its ISO/IEC 17025 accreditation, usually issued by a body like ANAB or A2LA. If it’s not there, look the lab up independently before trusting the document.
- A sample date over a year old. Alkaloid content and microbial baseline shift over time, so an old sample date doesn’t describe today’s product.
- No heavy metals panel. Given the FDA’s 2018 findings on this exact issue, its absence is a serious gap.
- No Salmonella test. After the 2017–2018 outbreak, this became a baseline expectation. Leaving it off suggests the vendor either isn’t testing or isn’t disclosing.
- 7-HMG above roughly 0.1% in plain leaf. Naturally occurring levels rarely top 0.02%; anything much higher suggests deliberate enhancement.
- Pass/fail only, with no numbers. A real COA gives you concentrations, CFU counts, or exposure figures you can check against known limits — not just a checkmark.
- A QR code that only links back to the vendor’s own site. It should point to the lab’s independent verification portal. If it doesn’t, the chain of custody is broken.
What Adulteration Looks Like on a COA
Adulteration in the kratom market isn’t hypothetical — it’s been documented, and it leaves traces on a COA if you know what to look for.
7-Hydroxymitragynine enhancement. Plain dried leaf naturally contains well under 0.02% 7-HMG. Products labeled as plain leaf but showing 0.1%, 0.5%, or higher have likely been fortified with isolated 7-HMG, or processed in a way that pushes mitragynine to oxidize into it. The 2016 study mentioned earlier documented exactly this pattern across several commercial products.
Spiking with non-kratom substances. A notorious set of fatality cases published in 2011 involved a kratom-labeled product called “Krypton” that had actually been laced with O-desmethyltramadol, a synthetic opioid metabolite. Autopsy results showed the tramadol metabolite alongside mitragynine — a reminder that an alkaloid test limited to mitragynine alone can miss dangerous additions.
A full minor alkaloid profile — speciogynine, speciociliatine, paynantheine, corynantheidine — is the best safeguard here, because genuine kratom shows a consistent ratio among these compounds. A product claiming to be whole-leaf kratom but missing that minor alkaloid signature is either an extract in disguise or something else entirely.
Why COAs Became Essential
Three specific events pushed COAs from a nice-to-have into a baseline expectation for kratom buyers.
The 2017–2018 Salmonella outbreak. Health officials linked kratom products to well over a hundred confirmed cases of salmonellosis spread across dozens of states, with several outbreak strains traced back to specific supplier lots. Afterward, pathogen testing on every production lot became standard practice among responsible vendors.
The 2018 FDA heavy metals findings. When the FDA tested retail kratom products, a meaningful share showed lead and other metal levels above recommended daily limits. That exposed how many vendors simply weren’t screening for metals at all, and it made ICP-MS testing a basic market expectation.
Documented commercial adulteration. Research has repeatedly found inconsistent alkaloid content and selective 7-HMG enrichment in products sold as kratom. Without a full alkaloid panel on a COA, there’s no practical way for a buyer to catch this.
Together, these events reset the baseline. A vendor that still isn’t publishing lot-specific COAs is operating below a standard the industry itself was forced to adopt.
COA vs. GMP Qualification: Different Things
A COA and a Good Manufacturing Practice (GMP) qualification, like the one the American Kratom Association administers, measure different things and work best together. A COA describes one specific batch of product. GMP qualification describes the facility and process that made it.
- COA: lot-specific, based on lab testing, tells you what’s actually in the product
- GMP qualification: facility-specific, based on audits, tells you whether the manufacturing process follows documented quality procedures
A vendor can have one without the other. Solid due diligence checks both.
What Responsible Testing Looks Like in Practice
A vendor doing this correctly follows a consistent process for every incoming batch:
- Sourcing from vetted suppliers with traceable origins
- Assigning each batch a unique lot number
- Pulling a representative sample per standard guidelines and sending it directly to an independent lab
- Running the full panel — alkaloids, heavy metals, microbiology, and Salmonella
- Comparing results against internal specifications before releasing the product
- Rejecting any lot that fails a specification rather than reworking it
- Keeping COAs on file and available to customers by lot number
If a vendor can’t produce a lot-specific COA on request, that’s worth treating as a gap in their process, not an oversight in paperwork.
Closing Thoughts
A COA is a snapshot of one batch, tested by a specific lab, at a specific point in time — nothing more, nothing less. It’s genuinely useful information, but only when it’s complete, current, and traceable back to the product you’re actually holding. Learning to spot the gaps — a missing metals panel, a stale sample date, a pass/fail with no numbers — turns a piece of paper into a real check on what you’re buying.
Frequently Asked Questions
What does ISO/IEC 17025:2017 accreditation mean?
It’s the international standard for lab competence in testing and calibration. Accredited labs have been independently audited on their technical procedures, staff qualifications, equipment calibration, and data quality — and they’re subject to periodic re-audits. Bodies like ANAB and A2LA issue this accreditation after on-site review.
Can I verify a kratom COA myself?
Yes. A legitimate COA lists the lab’s name, address, and accreditation number. You can look the lab up directly and check its accreditation status on the accrediting body’s public database. Many COAs also include a QR code linking to the lab’s own verification portal — if the code only leads back to the vendor’s website, be cautious.
How often should kratom actually be tested?
Every new production lot, before it’s sold. One COA can’t represent future batches, since alkaloid content, microbial levels, and metal exposure can all shift between harvests and processing runs. Vendors doing this right test each incoming batch, issue a matching COA, and reject anything that fails rather than blending it into other stock.
What’s the difference between HPLC and LC-MS for alkaloid testing?
HPLC separates and measures alkaloids based on how they move through a chromatography column, often paired with UV or diode-array detection. LC-MS/MS adds mass spectrometry, identifying compounds by molecular mass and fragmentation pattern — more specific than UV detection alone. LC-MS is better suited to catching adulterants and trace compounds; HPLC-DAD is the standard, adequate method for routine mitragynine and 7-HMG measurement.
Why do alkaloid percentages vary between lots from the same vendor?
Because kratom is a plant, not a manufactured compound. Alkaloid content depends on tree genetics, harvest timing, leaf age, drying method, and handling after harvest — even leaves from the same tree can vary by season. If a vendor’s COAs show identical alkaloid numbers batch after batch, that’s a sign of reused data, not consistency. Natural variation is expected, typically in the 1.0%–2.0% mitragynine range for plain leaf.
Does having a COA mean a product is safe?
No. A COA confirms that a specific batch was tested and fell within specification at the time of sampling. It doesn’t account for your individual health situation, medication interactions, or how much you take. Safety is a personal decision that a lab report can’t make for you.
What if a COA only lists the mitragynine percentage?
That’s the bare minimum — it tells you alkaloid content but nothing about contamination or adulteration. A complete COA includes mitragynine, 7-HMG, the minor alkaloid profile, heavy metals, microbial results, and a Salmonella test. If all you’re given is a single mitragynine line, ask the vendor for the full panel.
How can I tell a COA hasn’t been altered?
Check for a QR code linking to the lab’s own system, look up the lab’s accreditation directly through ANAB or A2LA, confirm the lot number matches your product, and if you want certainty, contact the lab directly with the sample ID. A vendor confident in its testing will welcome these checks, not discourage them.
