How to Choose a Third Party Testing Laboratory in India
Independent testing is the only quality control that does not rely on your manufacturer’s own reporting. Choosing a laboratory is mostly about accreditation scope and method capability. Here is what to check and how to use them well.
Why You Need One At All
This guide is for supplement, Ayurvedic and herbal brand owners in India.
Your manufacturer tests your batches and reports the results. That is normal and necessary, and it is also self-reporting. Independent testing verifies it, which makes it the single highest-value addition to a small brand’s quality system.
You do not need to test every batch independently. Periodic verification is enough to establish whether the documentation you receive reflects reality, and to detect drift in sourcing or process that the manufacturer’s own reporting may not surface.
What to Check Before Choosing
Each of these affects whether the results will be useful.
- Accreditation, and specifically its scope: a laboratory accredited for some tests is not accredited for all of them. Ask for the scope document and check your tests appear on it.
- Method capability for your specific tests, particularly marker assays for botanical extracts, which require the right instrumentation and validated methods.
- Whether they can run the same method your manufacturer uses, since results from different methods are not comparable.
- Microcystin, mycotoxin or other specialist screening if your product needs it, as not all laboratories offer these.
- Turnaround time, and whether it is realistic for your purposes.
- Reporting format, including whether methods and limits of detection are stated.
- Sample quantity required, so you can plan what to send.
- Whether they advise on method selection, which is useful if you are unsure.
- Cost per panel rather than per test, since bundled panels are usually better value.
Matching Methods Matters More Than It Sounds
This is the most common reason independent testing produces confusion rather than clarity.
Marker assays for botanical extracts give different numbers by different methods. If your manufacturer reports a marker percentage by one method and your independent laboratory tests by another, a difference in the results may be a method difference rather than a quality problem.
So specify the method when you send a sample, and specify the same method your manufacturer uses. If you want to compare across methods deliberately, do so knowingly rather than discovering the discrepancy and assuming the worst.
Ask the laboratory to state the method and the limit of detection on the report. A number without a method is as hard to interpret from a laboratory as from a manufacturer.
Sampling Properly
A badly taken sample produces a meaningless result.
| Practice | Why |
|---|---|
| Take the sample from received stock | Tests what you actually have, not what was sent for testing |
| Record the batch number | Without it the result cannot be tied to anything |
| Take enough quantity | Insufficient sample means a repeat or a partial panel |
| Keep the sample sealed and unopened where possible | Avoids contamination and moisture pickup |
| Send promptly | Delay changes moisture and microbial counts |
| Keep a retained portion | Allows a second opinion if the result is unexpected |
| Note storage conditions before sampling | Explains results that look wrong |
Keep a retained portion of every sample you send. If a result is unexpected, a second laboratory on the same material is far more informative than a new sample from a different unit.
What to Do With an Unexpected Result
Do not escalate before checking the obvious.
Check the Method
Confirm the laboratory used the method you specified and that it matches your manufacturer’s. Method mismatch is the most common explanation.
Check the Sampling
Confirm the batch number, how the sample was stored and how promptly it was sent.
Retest
Use your retained portion, ideally at a second laboratory, before concluding anything.
Then Raise It
Once verified, raise it with your manufacturer in writing, with the method and result stated, and request their retention sample be tested.
A verified out-of-specification result is a serious matter. An unverified one damages a relationship over what may be a method difference.
Selection Checklist
Work through before committing.
- Obtain the accreditation scope document and confirm your tests appear on it.
- Confirm method capability for your marker assays.
- Confirm they can run the same methods your manufacturer uses.
- Confirm any specialist screening your product needs.
- Confirm turnaround and sample quantity required.
- Confirm reports state methods and limits of detection.
- Compare cost by panel rather than by individual test.
- Plan a testing frequency, even if it is only periodic.
- Sample from received stock, record the batch and retain a portion.
- Verify any unexpected result before raising it.
- File all independent reports in the product file alongside the batch COA.
Happy to Be Independently Verified
Share your product and our team will provide batch documentation with methods stated, ready for independent verification.
Frequently Asked Questions
Why use an independent laboratory at all?
Because your manufacturer’s testing, however competent, is self-reporting. Independent verification is the only control that checks whether the documentation you receive reflects reality, which makes it the highest-value addition to a small brand’s quality system.
Do I need to test every batch independently?
No. Periodic verification is enough to establish whether your documentation is reliable and to detect sourcing or process drift. The point is to verify sometimes rather than never, not to duplicate your manufacturer’s panel on every batch.
What should I check about accreditation?
The scope, not just the existence. A laboratory accredited for some tests is not accredited for all of them, so request the scope document and confirm your specific tests appear on it before sending samples.
Why does the test method matter so much?
Because marker assays for botanical extracts produce different numbers by different methods. If your laboratory uses a different method from your manufacturer, a difference in results may be a method difference rather than a quality problem.
What should I do with an unexpected result?
Check that the specified method was used and matches your manufacturer’s, check the sampling and storage, then retest using your retained portion, ideally at a second laboratory. Verify before raising it, since unverified results damage relationships over method differences.