Kratom Foreign Material Controls: Screens, Magnets, Metal Detection and X-Ray Explained

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The short answer

Foreign-material control is the work of preventing, finding, removing and investigating objects or substances that do not belong in a product. For a botanical powder such as kratom, possible foreign material can include stones, soil, pieces of sack or string, wood, insects or insect fragments, hair, brittle plastic, glass, rust and metal worn from processing equipment.

No single inspection can rule out every kind of foreign material. A screen separates material by size. A magnet attracts certain metals. A metal detector responds to metal under defined operating conditions. X-ray equipment looks for differences in density. Visual inspection can find obvious abnormalities but depends on visibility, sampling and human performance. These tools answer different questions.

A credible control program therefore uses layers: supplier controls, receiving examination, screens or sifters, equipment maintenance, glass and brittle-plastic controls, in-process detection, packaging checks, documented challenge tests, complaint trending and lot-specific investigation. A certificate of analysis, or COA, may add useful information, but a conventional chemistry or microbiology panel does not by itself establish that a lot is free of foreign material.

The most useful customer question is not simply, “Was this tested?” It is: What hazards were considered, where were they controlled, how was the equipment checked, and what happened to rejected or suspect material?

Why foreign material deserves its own quality conversation

Kratom begins as agricultural plant material. Agricultural supply chains are exposed to soil, harvesting tools, collection containers, drying surfaces, bags, pallets, grinders, screens and multiple transfer points. Processing can reduce some risks while creating others. A screen may remove stones but shed a broken wire. A grinder can make plant material uniform but can also generate metal if a worn component contacts another surface. A package may leave the line intact yet be damaged during distribution.

Foreign material is not the same as:

• Microbial contamination, such as Salmonella or pathogenic E. coli;
• Chemical contamination, such as lead, arsenic, pesticide residues or cleaning compounds;
• Botanical misidentification, in which the wrong plant or plant part is present;
• Adulteration with another active ingredient;
• Alkaloid composition, including mitragynine or 7-OH concentration; or
• Ordinary product variation, such as natural differences in powder color or particle size.

These categories can overlap. Soil may introduce both visible grit and microorganisms. A corroding machine part may generate visible flakes and contribute elemental contamination. Insect activity can produce whole insects, fragments, webbing, excreta and conditions associated with broader sanitation failures. But one test result should not be treated as proof about every other category.

FDA’s dietary-supplement current good manufacturing practice rule requires equipment to be designed and maintained so its use does not contaminate components or supplements with metal or glass fragments, filth or other extraneous material. It also requires contamination limits where needed, appropriate examinations, monitoring of necessary in-process points and quality-control review. Those requirements create a system expectation; they do not prescribe one universal device or one numerical kratom specification. 21 CFR Part 111, Subpart D and 21 CFR Part 111, Subpart E.

A working vocabulary

Clear language prevents false reassurance.

Foreign material

A broad practical term for matter that is not intended to be in the product. It can be hazardous, objectionable without being acutely hazardous, or evidence of a process failure that requires investigation.

Extraneous material

FDA’s Food Defect Levels Handbook describes extraneous material as foreign matter associated with objectionable production, storage or distribution conditions, including substances such as sand, soil, glass and rust. The handbook separately gives examples of foreign matter such as sticks, stones and bagging. These definitions are useful for literacy, but the handbook does not create a kratom-specific allowance. FDA Food Defect Levels Handbook.

Intrinsic material

Material naturally belonging to the botanical, such as pieces of leaf vein or stem. “Natural” does not automatically mean acceptable: the intended plant part, label description, particle-size specification and product form still matter. A fibrous stem fragment in coarse tea-cut leaf presents a different question from a hard fragment in a fine powder or capsule.

Hard or sharp foreign object

An object whose physical properties may create an injury concern. FDA’s Compliance Policy Guide 555.425 discusses hard or sharp objects in food and uses size, intended use, processing and consumer group as factors in enforcement evaluation. It is guidance to FDA staff, not a universal product specification or permission to ignore objects below a particular size. FDA CPG 555.425.

Detection limit

The smallest, least dense or least detectable test piece a system can reliably find under defined conditions. It is incomplete without the material type, dimensions, product, package, speed, orientation, location and acceptance criteria.

Reject

Product or a test piece diverted by a detection system. A functioning reject device is only one part of the control. The reject must be secured, reconciled and investigated so it cannot accidentally return to production.

The source-to-customer foreign-material map

Stage	Example sources	Useful controls	Records that should exist
Cultivation and harvest	Stones, soil, sticks, insects, wire, tool fragments	Supplier requirements, harvest practices, sorting	Supplier specifications, audit or qualification records
Drying and initial processing	Drying-surface debris, packaging fibers, pests	Controlled drying surfaces, pest controls, covered transfer	Sanitation, pest-control and lot records
Receiving	Torn sacks, pallet splinters, container damage	Seal and package inspection, representative examination, quarantine	Receiving log, photographs, sample record, disposition
Milling	Worn blades, screens, fasteners, metal-to-metal contact	Preventive maintenance, screens, magnets, detector checks	Equipment log, pre-use inspection, maintenance history
Blending and conveying	Gaskets, plastic, brush bristles, prior-product debris	Line clearance, equipment integrity, controlled utensils	Batch record, tool accountability, deviation records
Encapsulation	Machine wear, capsule fragments, loose fasteners	Equipment checks, vision systems, metal detection	Start-up checks, challenge records, reject log
Packaging	Glass, brittle plastic, closure fragments, staples	Container controls, line inspection, package examination	Packaging reconciliation, breakage report
Storage and shipping	Damaged seals, pallet debris, punctures, infestation	Package-integrity checks, protected storage, complaint review	Warehouse inspections, shipping records, complaint trends

The table is a risk map, not a claim that every listed device is mandatory for every product. The control should fit the reasonably anticipated hazard and the actual process.

What screens and sifters do

A screen passes smaller particles through an opening while retaining larger particles. It can help standardize particle size and remove oversized material such as stones, wood, clumps or pieces of packaging. Screen performance depends on much more than the nominal mesh number.

Important variables include:

• Aperture size and wire diameter;
• Screen material and construction;
• Product feed rate and bed depth;
• Whether powder is dry, cohesive or electrostatic;
• Vibration or centrifugal force;
• Screen area and residence time;
• Cleaning frequency;
• Whether fragments can align and pass through an opening;
• Screen integrity before and after use; and
• The location of the screen in the process.

“Sifted” is not a complete quality claim. A fine wire can pass lengthwise through a larger aperture. A soft plastic film can fold. A dense stone smaller than the aperture can pass. Material can also enter after the final screen. The screen’s purpose, location and integrity record matter as much as the mesh designation.

Screen integrity checks

A practical written procedure may include pre-use and post-use visual inspection, verification of the installed screen identity, confirmation that clamps and gaskets are intact, documentation of repairs, and an investigation if a tear or missing wire is found. The investigation should identify the time window, affected lots, fragment characteristics, downstream controls and product disposition.

A post-use failure cannot be closed by writing “screen replaced.” The quality question is what happened to material processed since the last documented acceptable check.

What magnets do—and do not do

Magnets can capture ferromagnetic material such as many iron and steel fragments. Their usefulness depends on magnetic strength at the product-contact surface, product flow, distance from the magnet, cleanliness, geometry and the magnetic properties of the fragment.

Magnets do not detect glass, stone, wood, most plastics or all metals. Many stainless-steel grades are less magnetic than ordinary carbon steel, and processing can change magnetic response. A magnet therefore cannot stand in for a metal detector or an overall foreign-material program.

Useful magnet records may include:

• Unique magnet identification and location;
• Rated strength and how it was verified;
• Inspection and cleaning frequency;
• Observed material, with photographs where appropriate;
• Approximate amount and physical description;
• Lot and time range exposed;
• Escalation trigger;
• Corrective action; and
• Quality review.

Metal repeatedly found on a magnet is information, not evidence that the system “worked perfectly.” It may show that the magnet captured a hazard, but it can also signal upstream wear that needs correction.

How metal detectors work

Industrial metal detectors typically generate an electromagnetic field and look for a disturbance caused by metal passing through the aperture. Performance varies among ferrous metal, nonferrous metal and stainless steel. The product itself, package, aperture size, conveyor speed, vibration and nearby equipment can affect sensitivity.

A responsible statement looks like this:

The detector was challenged at the documented line settings with specified ferrous, nonferrous and stainless-steel test pieces placed in defined positions, and the system detected and rejected each challenge according to the procedure.

An irresponsible statement is:

Metal-free.

The first describes evidence under known conditions. The second makes an absolute claim no finite inspection can establish.

Why test-piece details matter

A record that says only “metal detector passed” leaves essential questions unanswered. A meaningful record identifies:

1. Detector and line;
2. Product and package format;
3. Test-piece material;
4. Test-piece size and shape;
5. Placement or position;
6. Conveyor or product-flow conditions;
7. Date and time;
8. Operator;
9. Detection and reject outcome;
10. Alarm and line-stop function, if applicable;
11. Frequency of checks; and
12. Action if a challenge fails.

A test at the start of production does not prove the system remained functional all day. Many programs use checks at defined intervals and at the end of the run, with additional checks after stoppages, settings changes or maintenance. The justified frequency should be written and risk-based.

Product effect and package effect

Moisture, salt, temperature and other product characteristics can create a signal that resembles metal. Although dry leaf powder may have less product effect than some wet foods, assumptions should be confirmed on the actual matrix. Foil or metallized packaging can interfere with some conventional systems, which may move detection upstream of the package or make another technology more suitable.

What X-ray inspection can add

X-ray systems examine differences in density within a product and package. They may detect some dense contaminants—such as certain glass, stone, bone or metal—that a conventional metal detector cannot distinguish in the same package. They can also support other checks, depending on system design.

X-ray is not a universal foreign-material camera. Low-density plastic, wood, hair, insects and thin materials may be difficult or impossible to detect. Detectability depends on density, thickness, orientation, position, product background, package, image settings and algorithm performance.

A vendor specification alone does not prove performance on kratom powder or capsules. Challenge studies should use the actual product form, package, operating range and relevant contaminant types. Images and reject events should be controlled records, not unexplained screenshots.

Visual, macroscopic and microscopic examination

Visual examination remains valuable because humans can recognize unexpected color, shape, fibers, webbing, package damage and pattern changes. FDA’s dietary-supplement rule recognizes gross organoleptic, macroscopic and microscopic analysis among possible scientifically valid examinations, depending on their purpose and suitability. 21 CFR §111.75.

But “visually inspected” is incomplete without a sampling plan and method. Questions include:

• How much product was examined?
• From how many containers and locations?
• Under what lighting and magnification?
• On what background?
• Was the powder spread to a defined depth?
• What defect categories and decision rules were used?
• Was the analyst trained with reference images or samples?
• Was the finding retained or photographed?

Microscopy can help characterize plant structures, insect fragments, fibers or other particles, but it is not automatically an identity test and does not provide a full-lot guarantee. A tiny laboratory portion may not contain a sporadically distributed object. That is why prevention and in-process controls are crucial.

FDA’s 7–25 mm guidance: what it actually means

FDA CPG 555.425 states that hard or sharp foreign objects measuring 7 mm to 25 mm in a ready-to-eat food, or one requiring only minimal preparation that would not neutralize the hazard, meet specified criteria for direct-reference enforcement consideration. The guide also describes review pathways for objects below 7 mm when a special-risk group is involved and for objects over 25 mm. Intended use and further processing matter.

Three cautions are essential:

1. It is not a kratom specification. The CPG is enforcement guidance, not a statement that every object below 7 mm is acceptable.
2. It addresses hard or sharp objects. Hair, insects, fibers, soft plastic, sanitation debris and economic adulteration raise different questions.
3. Quality expectations can be tighter than an enforcement threshold. A company should not design a process to operate just below the point at which FDA guidance discusses a particular enforcement pathway.

FDA’s Defect Levels Handbook makes the same broader point: action levels address certain natural or unavoidable defects, poor manufacturing practices can support enforcement regardless of an action level, harmful products are actionable regardless of the listed level, and products without a defect level are evaluated case by case. Kiody should not invent a “legal foreign-material limit” for kratom where no authoritative kratom-specific limit has been established.

Why a COA may not answer the question

A standard kratom COA often reports alkaloids, microorganisms and elemental contaminants. None of those sections necessarily evaluates whole foreign objects.

• An ICP-MS result for iron does not show whether a visible steel fragment is present.
• A heavy-metals panel does not assess glass, plastic or stones.
• A passing microbiology panel does not exclude insects, hair or packaging fibers.
• An alkaloid panel does not establish botanical cleanliness.
• “Appearance: conforms” may mean only that a small sample looked like the expected powder.

A foreign-material examination can appear on a COA, inspection report or separate manufacturing record. The absence of a line item does not prove the company lacks controls; many effective controls occur during receiving and production. Conversely, a line reading “foreign matter: pass” is weak evidence if the sample size, method and acceptance criteria are unavailable.

Building a layered control plan

1. Define the product and intended use

Fine leaf powder, coarse tea-cut leaf, pure-leaf capsules, extracts, liquids and gummies have different hazard profiles and detection options. Kiody’s pure-leaf capsules contain approximately 500 mg of leaf powder per capsule; they should not be confused with extract capsules or concentrated 7-OH products.

2. Map credible sources

Walk the process from harvest through finished shipment. Include supplier equipment, bags, containers, knives, pallets, screens, grinders, conveyors, hoppers, brushes, tools, fasteners, lighting covers, packaging components and warehouse conditions.

3. Write specifications and action limits

Specifications should state what is controlled, where, by what method and with what decision rule. “No foreign material” may be an aspiration, but the operating procedure still needs observable criteria and a response to any finding.

4. Control the source

Supplier qualification, facility expectations, lot traceability, intact packaging and change notification can prevent more problems than end-product inspection alone.

5. Select complementary controls

A common sequence could include receiving inspection, scalping screen, rare-earth magnet, finer sifter, equipment-integrity checks, in-line metal detection and finished-package examination. This is an example, not a universal prescription.

6. Establish performance evidence

Document that each device works with the actual product and process. Record test-piece types, sizes, locations, speeds and worst-case conditions. Define who may change settings.

7. Secure and reconcile rejects

Reject bins should be controlled. Every automated reject should be accounted for, examined when appropriate and linked to time and lot. Unexplained reject counts deserve escalation.

8. Investigate deviations and findings

FDA’s Part 111 quality-control rules require a material review and disposition decision when a specification is missed or an unanticipated occurrence may lead to adulteration. The response should address affected scope, root cause, corrective action and lot disposition—not merely removal of the one object found. 21 CFR Part 111, Subpart F.

9. Trend the system

Track findings by supplier, material, line, equipment, shift, operator and product form. One metal shaving is an event. Three similar shavings from consecutive lots may reveal a failing component. Trend review turns isolated observations into preventive information.

Five worked scenarios

Scenario 1: A stone on the receiving screen

A small stone is retained while an imported leaf lot is screened. The screen performed one intended function, but the finding should still be logged. Quality reviews the supplier, quantity and condition of the material, receiving sample, prior trend and whether smaller stones could pass the screen. The appropriate decision may range from continued processing under established controls to rejection, depending on the evidence and specification.

Bad conclusion: “The stone was removed, so the lot passed.”
Better conclusion: “The lot remained quarantined while quality evaluated the nature, distribution and control of the finding against the approved specification.”

Scenario 2: Broken sifter wire discovered after a run

Post-use inspection finds a missing wire segment. The team identifies the last documented acceptable check, stops related material, searches equipment, examines retained screen fragments, reviews downstream magnets and detectors, and determines which lots were exposed. A passing detector challenge may reduce uncertainty for detectable metal but does not automatically account for the missing segment or prove it could not have broken into undetectable pieces.

Scenario 3: Metal detector challenge failure

The end-of-run stainless-steel test piece is not detected. Product since the last successful check is placed on hold. The detector, settings and reject mechanism are evaluated. Reinspection may be considered only under an approved, justified process. Quality documents the failure, affected interval, investigation, corrective action and disposition. Deleting the failed check and repeating until a pass would be testing into compliance.

Scenario 4: Blue plastic found in a capsule bottle

A customer reports a blue fragment. The complaint record preserves the bottle, lot number, fragment and photographs. The investigation compares the fragment with gloves, scoops, gaskets, bins and packaging components; reviews retained samples and complaints; and determines whether other lots share the same equipment window. A metal detector result is irrelevant because plastic is not metal.

Scenario 5: “Foreign matter: absent” on a supplier COA

The supplier cannot provide method, sample amount, acceptance criteria or analyst record. The statement may still be a data point, but it is not sufficient evidence by itself. The receiving company applies its own approved examination or other qualified control and addresses the documentation weakness through supplier qualification.

Eighteen warning signs in foreign-material claims

1. “Metal-free” or “100% contaminant-free” absolute language.
2. “Metal detector passed” without test-piece material and size.
3. One sensitivity number with no distinction among ferrous, nonferrous and stainless steel.
4. No product or package identified in the challenge record.
5. No start, interval or end-of-run checks.
6. A reject device that is not locked, monitored or reconciled.
7. Rejected product returned to the line without documented evaluation.
8. Screens identified only as “fine mesh.”
9. No pre-use or post-use screen-integrity check.
10. Repeated magnet findings treated as proof of success rather than a wear signal.
11. X-ray claims that include all plastic, wood, hair and insects without evidence.
12. A COA “pass” with no method, sample size or specification.
13. No distinction between elemental analysis and physical-object detection.
14. Unexplained detector setting changes during a run.
15. Missing test pieces or incomplete tool accountability.
16. A customer object discarded before identification or photographs.
17. Investigation limited to the individual package, with no lot or time-window assessment.
18. Use of FDA’s 7 mm discussion as an automatic safe harbor.

A proposed 30-field Kiody review record

For supplier and manufacturer review, Kiody could request or internally document:

1. Product name and form;
2. Finished lot number;
3. Component or source lot numbers;
4. Supplier and manufacturing site;
5. Process-flow diagram version;
6. Foreign-material risk assessment version;
7. Receiving-package condition;
8. Receiving examination method and sample size;
9. Screen or sifter identifier;
10. Aperture or mesh specification;
11. Pre-use integrity result;
12. Post-use integrity result;
13. Magnet identifier and location;
14. Magnet inspection result;
15. Detector or X-ray identifier;
16. Approved program or recipe;
17. Product and package configuration;
18. Ferrous challenge size and result;
19. Nonferrous challenge size and result;
20. Stainless-steel challenge size and result;
21. Challenge positions and orientation;
22. Challenge times and frequency;
23. Reject-mechanism verification;
24. Total production quantity;
25. Reject count and reconciliation;
26. Findings and retained evidence;
27. Equipment maintenance since prior lot;
28. Deviations and affected time window;
29. Quality-control disposition; and
30. Reviewer, date and linked corrective actions.

This proposed record is a transparency framework, not a claim that every field must appear on a public COA. Some records contain proprietary facility information and are more appropriately reviewed through qualification, audit or controlled document exchange.

Product-form differences

Leaf powder

Screens, magnets and in-line metal detection may all be relevant. Sporadic objects can be missed by a small lab sample, so process controls are particularly important.

Pure-leaf capsules

Controls should address both the incoming powder and encapsulation or packaging equipment. Capsule shells and bottle components add new material sources. Approximately 500 mg per Kiody capsule describes the leaf fill; it is not an extract equivalence or potency promise.

Extracts

Extraction and filtration may remove some coarse material, but extract processing introduces vessels, filters, pumps, solvents, carriers and drying equipment. A clear liquid may still require package and equipment controls. Physical cleanliness does not establish acceptable residual solvents or alkaloid composition.

Gummies and beverages

Wet, conductive or foil-packaged products can behave differently in metal detection. Added ingredients broaden supplier and allergen considerations. Product-specific validation is essential.

Enhanced or concentrated 7-OH products

Foreign-material controls do not answer whether a product’s composition or sale is lawful. A physically clean tablet can still contain a prohibited concentration or scheduled derivative. Kiody does not sell concentrated 7-OH.

Current federal 7-OH and derivative note

As of August 30, 2026, the federal threshold proposal for 7-OH is still a proposal, not a final scheduling rule. HHS extended the public-comment period through September 10, 2026. The proposal and its measurement questions should not be described as current federal law. HHS extension notice, 91 FR 55104.

A separate DEA temporary order is already effective. Mitragynine pseudoindoxyl, MGM-15 and MGM-16 entered federal Schedule I on August 26, 2026, with the temporary order scheduled to run until August 26, 2028 unless extended or made permanent through further federal action. The order applies federal Schedule I controls to manufacture, distribution, import, export, research, chemical analysis and possession of those substances. DEA temporary scheduling order, 91 FR 54948.

These legal categories are separate from physical foreign-material control:

• Botanical leaf is not the same product category as a deliberately concentrated or enhanced 7-OH article.
• A foreign-material inspection cannot determine the 7-OH percentage or identify every derivative.
• An alkaloid test cannot establish absence of glass, plastic, stone or equipment fragments.
• State and local rules may be more restrictive than the federal baseline.

FDA also states that kratom has not been lawfully marketed in the United States as a conventional food or dietary supplement and warns against unapproved medical claims. Kiody content should describe voluntary quality controls without implying FDA approval or lawful dietary-supplement status. FDA and Kratom.

Questions adults can ask a kratom company

• Is the product leaf, pure-leaf capsules, extract or enhanced material?
• Does the company define a finished lot and link it to component lots?
• Which foreign-material hazards were considered for this product form?
• Are receiving packages and seals examined?
• Are screens identified and checked before and after use?
• Are magnets inspected and findings trended?
• If metal detection is used, are ferrous, nonferrous and stainless-steel challenges documented?
• Is detection checked on the actual product and package?
• How are rejects secured and reconciled?
• What happens after a failed challenge or damaged screen?
• Are customer-returned objects preserved and compared with facility materials?
• Does quality control approve the final investigation and lot disposition?

A company may not publish every manufacturing record. The trust signal is whether it can explain the system accurately, avoid absolute claims and provide meaningful lot-specific evidence when a problem arises.

Frequently asked questions

Does a fine screen remove all foreign material from kratom?

No. A screen separates mainly by particle size and geometry. Smaller objects, flexible film, aligned wire and material entering after the screen may pass or bypass that control.

Is “triple sifted” a regulated quality grade?

Not by itself. The phrase does not identify aperture sizes, equipment, screen integrity, sequence, sample plan or acceptance criteria. It can describe a process only when the underlying details are defined.

Can a magnet find stainless steel?

Sometimes, but not uniformly. Magnetic response depends on the stainless-steel grade, processing history, fragment and magnetic system. A magnet does not detect every metal.

Can a metal detector find glass or stones?

Conventional metal detectors are designed for metal. Glass and stone require other controls; sufficiently dense pieces may be detectable by a validated X-ray system.

Can X-ray find plastic?

Some dense or thick plastics may be detectable in some configurations, but many low-density plastics are difficult to distinguish from the product. Claims must be supported on the actual product and package.

Does an ICP-MS heavy-metals test detect metal fragments?

It measures selected elements in the prepared analytical portion. It is not a whole-object inspection and does not establish absence of a sporadic metal fragment elsewhere in the lot.

What does “foreign matter: absent” mean on a COA?

It should mean absent in the examined sample under the stated method and decision rule. Without the method, sample amount and specification, the statement has limited interpretive value.

Does FDA allow foreign objects smaller than 7 mm?

FDA’s 7 mm discussion is part of enforcement guidance for hard or sharp objects and includes context and special-risk considerations. It is not a general permission, kratom limit or assurance that a smaller object is acceptable.

Are natural sticks or stems automatically acceptable?

No. Acceptability depends on the intended plant part, product description, particle-size and foreign-material specifications, intended use and physical characteristics.

What should happen when a screen breaks?

Affected material should be controlled while quality determines the last known acceptable check, exposed time window, missing material, downstream controls, examination options, root cause and disposition.

What should happen after a failed detector challenge?

Product since the last successful check should be placed under control. The company should investigate the detector and reject mechanism, define affected scope, use an approved corrective plan and document quality disposition.

Does one customer complaint prove the whole lot is contaminated?

Not automatically. It is still evidence that requires preservation, traceability and investigation. Distribution may be highly uneven, so lack of a similar finding in one retained sample does not erase the complaint.

Can a passing COA replace in-process controls?

Usually not for sporadic physical hazards. A small laboratory sample may miss an isolated object. Prevention, equipment integrity, detection and complaint review provide different layers of evidence.

Is foreign-material control the same as botanical identity testing?

No. Identity testing asks whether the intended botanical is present. Foreign-material control asks whether unintended matter is present. Some microscopic methods may contribute to both, but the specifications and conclusions differ.

Does foreign-material testing prove a kratom product is legal?

No. Legal status can depend on jurisdiction, product form, alkaloid composition, age restrictions, labeling and other factors. Physical quality evidence does not answer those legal questions.

Does Kiody sell concentrated 7-OH?

No. Kiody is 21+ and does not sell concentrated 7-OH. Kiody’s educational comparisons distinguish botanical leaf and pure-leaf capsules from extracts, enhanced products and scheduled derivatives.

Takeaway

Foreign-material quality cannot be reduced to a single “pass.” Screens, magnets, metal detectors, X-ray systems, visual examination and microscopy each have a defined field of view. The strongest evidence comes from a connected system that prevents contamination, verifies equipment, controls rejects, investigates every meaningful finding and links decisions to a specific lot.

For customers, the practical lesson is equally simple: look for precise explanations instead of absolute promises. “Checked with a validated detector under documented conditions” communicates something testable. “Contaminant-free” does not.

Primary sources and editorial references

1. Electronic Code of Federal Regulations, 21 CFR Part 111, Subpart D—Equipment and Utensils. Especially §§111.25, 111.27, 111.30 and 111.35.
2. Electronic Code of Federal Regulations, 21 CFR Part 111, Subpart E—Production and Process Control. Especially §§111.55, 111.70, 111.75 and 111.77.
3. Electronic Code of Federal Regulations, 21 CFR Part 111, Subpart F—Quality Control. Especially §§111.105, 111.113, 111.117 and 111.123.
4. FDA, CPG Sec. 555.425: Foods, Adulteration Involving Hard or Sharp Foreign Objects, May 2005.
5. FDA, Food Defect Levels Handbook.
6. FDA, FDA and Kratom, accessed August 30, 2026.
7. HHS, Hydroxymitragynine Above a Specified Threshold in Schedule I; Extension of Comment Period, 91 FR 55104, August 26, 2026.
8. DEA, Temporary Placement of Mitragynine Pseudoindoxyl, MGM-15, and MGM-16 in Schedule I, 91 FR 54948, effective August 26, 2026.