Kratom (Mitragyna speciosa) occupies an unusually difficult position for a botanical: it contains pharmacologically active alkaloids, it is sold in a fragmented market with uneven quality control, and it faces intense and shifting regulatory scrutiny. That combination makes rigorous testing essential, both for consumer safety and for any vendor who wants a defensible quality record. This guide covers the three pillars of kratom testing: botanical identity, alkaloid potency, and contaminant safety.
Why kratom testing is different
Most botanicals are tested primarily for contaminants. Kratom needs all of that plus quantitative alkaloid analysis, because its two key alkaloids drive both the product’s effect and the regulatory interest in it. A kratom COA that reports only heavy metals and microbials, with no alkaloid data, is incomplete.
Botanical identity: start with the right plant
Identity is the foundation. If the material is not confirmed Mitragyna speciosa, every downstream number describes the wrong thing. Identity is established by pairing macroscopic and microscopic examination with a chemical fingerprint: an HPLC or LC-MS alkaloid profile that matches the expected pattern for the species. This step also flags gross adulteration with unrelated plant material.
Alkaloid potency: the two that matter most
Kratom contains dozens of alkaloids, but two dominate the conversation:
- Mitragynine: the most abundant alkaloid by mass, and the primary marker used to characterize potency.
- 7-hydroxymitragynine (7-OH): present in far smaller amounts, but substantially more potent. Because of that potency, its concentration is watched closely, and abnormally high levels can indicate a spiked or concentrated product rather than natural leaf.
How alkaloids are measured
Quantitative alkaloid analysis is typically performed by HPLC with UV detection or, for greater sensitivity and specificity, by LC-MS/MS. The method quantifies mitragynine and 7-OH against reference standards and reports them as a percentage of the material or in mg per gram. Reporting both the concentration and the ratio of 7-OH to mitragynine is good practice, because an unusually high ratio is one of the clearest signals of adulteration.
Natural leaf has a characteristic, relatively low ratio of 7-hydroxymitragynine to mitragynine. A product where 7-OH is elevated well beyond that range has likely been concentrated or spiked with semi-synthetic material.
Contaminant safety
As an agricultural product that is dried, ground, and often imported, kratom carries the full range of botanical contamination risks.
Heavy metals
Lead, arsenic, cadmium, and mercury accumulate in plant material from soil and water and are a documented concern in kratom specifically. They are quantified by ICP-MS against established limits.
Microbial contamination
Drying and handling create opportunities for microbial growth. A standard panel includes total aerobic microbial count, total yeast and mold, and screening for specific pathogens (Salmonella and E. coli in particular), which have been implicated in kratom-related recalls and outbreaks.
Pesticides and other residues
Depending on sourcing, pesticide residue screening may also be warranted, along with checks for the residual solvents that can appear in extract products.
Adulteration and spiking
Because 7-OH is so potent, a real market risk is products enriched with semi-synthetic 7-hydroxymitragynine to boost effect. Detecting this requires quantitative alkaloid analysis and attention to the alkaloid ratio. A contaminants-only COA will miss it entirely. This is where the potency and identity work pays off beyond mere label verification.
What a complete kratom COA covers
| Test | Method | Why it matters |
|---|---|---|
| Species identity | Macro/micro + alkaloid fingerprint | Confirms it is M. speciosa |
| Mitragynine | HPLC-UV / LC-MS/MS | Primary potency marker |
| 7-hydroxymitragynine | LC-MS/MS | Potency + spiking indicator |
| Heavy metals | ICP-MS | Pb, As, Cd, Hg safety |
| Microbials | Plate count / pathogen screen | Salmonella, E. coli, yeast/mold |
How to read a kratom COA
Look for four things: a confirmed species identity, quantified mitragynine and 7-OH (with the ratio), heavy metals by ICP-MS against stated limits, and a microbial panel that names the pathogens screened. A COA missing the alkaloid data (or reporting a suspiciously high 7-OH level without comment) should prompt questions before purchase.
