How to Read a Kratom Certificate of Analysis (COA): What Lab Reports Reveal About Purity and Potency

A kratom Certificate of Analysis (COA) is the single document that tells you whether the powder in the pouch matches the marketing on the front. It reports the alkaloid percentages, screens for heavy metals and microbes, and confirms the batch was tested by a third-party lab — not by the vendor itself. Learning how to read one takes about ten minutes, and once you can, you will never look at an unverified pouch of kratom the same way again. This guide walks through every section of a real COA, what the numbers mean, and the red flags that should make you put the bag back on the shelf.

What a Certificate of Analysis actually is

A COA is a lab report issued by an independent testing facility, usually after the kratom has been imported, milled, and packaged in the United States. It is the only objective record of what is inside a specific batch of product. Reputable vendors publish or share COAs on request because they have nothing to hide; vendors who refuse, stall, or hand you a generic PDF unrelated to the lot number on your pouch are telling you something important.

The five sections of a kratom COA, in plain English

1. Sample and batch identification

At the top, you should see the product name, a unique batch or lot number, the date the sample was received, and the date of the report. The lot number on the COA must match the lot number printed on the pouch or the bottom of the bottle. If it does not match, the report is not for your product.

2. Alkaloid profile

This is the section most buyers care about. Kratom leaf naturally contains dozens of alkaloids, but two carry the most weight on a lab report:

• Mitragynine: the primary alkaloid in kratom, typically reported as a percentage of total dry weight. Quality leaf usually falls between roughly 1.0% and 1.8% mitragynine, though this varies by strain and harvest. Anything significantly higher than that range on a “plain leaf powder” COA is a flag — it may indicate the product was enhanced with extract.
• 7-hydroxymitragynine (7-OH): a much smaller alkaloid in natural leaf, usually reported as a fraction of a percent. Naturally occurring leaf rarely exceeds 0.05% 7-OH. Elevated 7-OH on a powder COA is another sign the product is not just dried, milled leaf.

3. Heavy metals screening

Kratom is grown in tropical soil, and the plant can pull metals from the ground. A complete COA tests at minimum for four heavy metals: arsenic, cadmium, lead, and mercury. Results should be reported in parts per million (ppm) or parts per billion (ppb), with each result compared to a regulatory limit. Look for “pass” or “compliant” against the American Herbal Products Association (AHPA) or USP <232> limits.

4. Microbial testing

Because raw kratom is a plant product, it can carry microbes if it is not dried and processed properly. A trustworthy COA tests for:

• Total aerobic plate count
• Yeast and mold
• Salmonella (must be absent)
• E. coli (must be absent)
• Coliforms

Any “detected” result on Salmonella or E. coli is an automatic disqualifier, regardless of how good the alkaloid numbers look.

5. Lab signature and accreditation

At the bottom of a legitimate COA, you should see the testing laboratory’s name, address, and ideally an accreditation marker such as ISO/IEC 17025. The report should also list the analyst, the methods used, and a signature or digital seal. A PDF without any of these elements is essentially anonymous and should not be trusted.

How to verify a COA is real

• Match the lot number. The number on the pouch and the number on the COA must be identical.
• Check the lab name. Search the lab online and confirm it is an independent third-party facility, not an in-house operation owned by the vendor.
• Look for the report date. COAs older than 12 months for the batch you are buying should raise an eyebrow.
• Confirm scope. The COA should cover alkaloids, heavy metals, and microbes — not just one of the three.

Red flags on a kratom Certificate of Analysis

• “Mitragynine” listed without a percentage
• Heavy metals listed as “tested” without numerical results
• Generic COA with no lot number that the vendor reuses across all products
• Lab name absent, redacted, or not searchable online
• Suspiciously high alkaloid percentages on a product labeled as plain leaf
• No microbial testing at all

If you see two or more of these, walk away. Our breakdown on the five signs of a trusted kratom vendor covers the broader vetting process beyond the COA itself.

Key facts at a glance

What is a kratom COA? An independent lab report showing the alkaloid content, contamination screening, and purity of a specific batch.
What alkaloids should be tested? At minimum, mitragynine and 7-hydroxymitragynine.
Typical mitragynine in quality leaf powder: roughly 1.0%–1.8% of dry weight.
Heavy metals to screen for: arsenic, cadmium, lead, mercury.
Microbes that must be absent: Salmonella and E. coli.
Acceptable lab accreditation: ISO/IEC 17025.
Does the lot number on the bag have to match the COA? Yes — without that match, the report does not apply to your product.

Frequently asked questions about kratom lab testing

Are kratom vendors required to provide a COA?

There is no federal mandate, but the American Kratom Association’s Good Manufacturing Practices (AKA GMP) program asks participating vendors to test every batch. A vendor who refuses to share a COA is choosing not to.

What does a high mitragynine percentage really mean?

On plain leaf powder, a higher mitragynine percentage generally indicates more potent material per gram, which means smaller serving sizes are needed. On a product that is supposed to be straight leaf, an unusually high number can indicate the powder was fortified with extract, which changes the product entirely.

Can a COA tell me which strain is “strongest”?

Alkaloid percentages give you a rough sense of potency by weight, but strain effects are not determined by mitragynine alone. The ratio of supporting alkaloids and the user’s own physiology matter just as much. Use COAs to confirm purity and consistency, not to rank strains.

Is 7-hydroxymitragynine the same as the alkaloid I see in kratom extract products?

The compound is the same, but the levels are not. Naturally occurring 7-OH in leaf powder is very small. Concentrated extracts and enhanced products can contain dramatically higher amounts and behave very differently from plain leaf. If you are new to kratom, start with leaf-based products and our beginner’s guide to Maeng Da before exploring extracts.

Does the format I buy change what should be on the COA?

The core sections — alkaloid profile, heavy metals, microbes — apply to powder, capsules, and gummies alike. Capsules and gummies should be tested as finished products, not just from the bulk powder upstream. Our comparison on kratom powder vs capsules walks through the differences between the formats themselves.

How Kratom Bloom approaches lab testing

Every kratom product we sell is sourced from harvest partners we have vetted on the ground in Southeast Asia and tested in U.S. labs before it reaches our shelves. We treat the COA as the floor, not the ceiling: alkaloid consistency, heavy metals compliance, and microbial screening on every lot, with documentation available for customers who ask. You can read more about our standards on the about Kratom Bloom page or message us through the contact form for batch-specific lab documentation.

Ready to buy from a vendor that publishes its work? Browse the full lineup of lab-tested kratom powders, capsules, gummies, and extracts at the Kratom Bloom shop, or start with a free kratom sample if you want to verify quality before committing to a full pouch.

Kratom is not approved by the FDA for the diagnosis, treatment, cure, or prevention of any disease. Products are intended for adults 21 and older. This article is informational and reflects general product education, not medical advice.