How to Switch Supplement Testing Labs Without Screwing Up Your Compliance

Your current lab ghosted you for two weeks. Or their prices jumped 40%. Or you found out they've been running your gummy vitamins through a method validated for tablets. Whatever the reason — you need a new lab, and you need the transition to be seamless.

Here's the thing nobody tells you: switching labs creates a compliance gap. Your batch records show Lab A for batches 1-12 and Lab B for batches 13+. Amazon documentation reviewers notice. FDA investigators notice. You need to connect those dots with documentation, or you've created a problem that didn't exist before.

I've helped a dozen brands switch labs mid-production. Here's exactly how to do it without creating a mess.

Step 1: Qualify the New Lab Before You Fire the Old One

This sounds obvious, but I've watched brands cancel their existing lab contract, then scramble to find a replacement. Don't do that.

While your current lab is still running your routine batches, qualify the new lab. That means:

• Verify ISO 17025 accreditation and scope
• Send a qualification sample (a batch you've already tested at the old lab)
• Compare results between old lab and new lab
• Document the comparison as a lab qualification report

The qualification sample is critical. Send the same batch, same matrix, requesting the same tests. If the results match within 10-15%, the new lab is qualified. If they're wildly different, you need to understand why before you trust your production batches to them.

You cannot skip this. Trusting a new lab with your first production batch without parallel testing is how you discover the new lab's method gives consistently lower potency results than your old lab — after you've already shipped product labeled at the old potency.

⚠️ Note

The qualification report matters. Write a one-page document listing: old lab name, new lab name, batch tested, tests compared, results from both labs, and a statement that the new lab's results are comparable and the lab is qualified. Sign it. File it. FDA investigators love seeing qualification documentation.

Step 2: Overlap Testing for At Least One Batch

Run at least one production batch through BOTH labs simultaneously. Ship split samples. Get COAs from both. File both.

This overlapping batch creates continuity in your batch records. Lab A tested batch 11. Both tested batch 12. Lab B tests batch 13 onward. Anyone reviewing your records sees a smooth handoff, not a gap.

It costs an extra batch of testing. But the alternative — batch 12 tested only at the new lab with no comparison to the old lab's methods — creates a question mark in your records that you'll have to answer during every audit and every Amazon documentation review for years.

Step 3: Update Your Documentation

When you switch labs, you need to update:

• Product specifications (111.70) — if the new lab uses different methods, your specs may need to reference those methods
• Testing program (111.75) — update the lab name, accreditation number, and methods
• Supplier qualification records — labs are suppliers of a service. Document the qualification of the new lab.
• Batch records — the next batch record should reference the new lab
• Amazon compliance documentation — upload new COAs with the new lab's credentials

The documentation update takes an afternoon. Skipping it creates a paper trail mismatch that FDA investigators are trained to notice.

Step 4: Handle the Amazon Transition

If you sell on Amazon, this is the trickiest part. Amazon's documentation team has seen your previous submissions with Lab A's COAs. When you submit Lab B's COA for the first time, they may flag it for review.

Avoid this by submitting a proactive update: upload the new lab's COA alongside a brief note explaining the transition and including the lab's ISO 17025 accreditation certificate. Amazon's team appreciates when you make their job easier.

Do NOT delete old COAs from your Amazon documentation. The full history matters. Lab A tested batches 1-11. Lab B tested batch 12 onward. That's a clean trail.

FAQ

Q: How long does a lab transition typically take?

From qualification to full transition: 3-4 weeks. That includes: finding a new lab (1-3 days through LabQuotes), sending qualification samples (1 week including shipping and TAT), running the overlap batch (1-2 weeks), and updating documentation (1-2 days). You can do it faster with rush testing, but 3-4 weeks is a comfortable timeline.

Q: What if my old lab won't release my data or retain samples?

Legally, the test data belongs to you — you paid for it. Your contract should specify data ownership. If the lab is withholding data, demand it in writing. For retain samples, ask for them to be shipped to you or to the new lab. If the lab refuses, document the refusal. You can't be penalized for something a third party refuses to do, but you need to show you tried.

Q: Can I use results from two different labs interchangeably?

Yes, IF you've qualified the new lab against the old lab and documented comparable results. The key word is "qualified." Without parallel testing data, you can't assume Lab A's number and Lab B's number mean the same thing. Different instruments, different analysts, slightly different methods — all produce slightly different numbers. The qualification process proves the differences are within acceptable range.

Q: Do I need to notify the FDA that I switched labs?

No. The FDA doesn't require notification of lab changes. But if you get inspected, the investigator will review your lab qualification records. The documentation you created in Step 1 is what they'll ask for. No notification needed, but documentation required.

Q: What if my new lab finds something the old lab missed?

This happens more often than you'd think — especially if you were using a non-accredited lab before and switched to an accredited one. If the new lab finds a failure the old lab didn't detect, you have a problem to investigate. The good news: you caught it. The bad news: you may need to review previous batches for the same issue. This is why switching TO a better lab is always net positive — finding problems before customers do is the whole point of testing.

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Quick Reference: Lab Transition Checklist

Lab Category Matching

Your new lab must hold the same or better qualifications as your old one. At minimum: ISO 17025 accreditation, scope covering your product matrix, methods validated for your dosage form. If Amazon compliance matters, the lab must be third-party (no financial interest in your product).

Internal links: See Find a Testing Lab and ISO 17025 vs Non-Accredited.

Real Methods — Cross-Lab Comparison

What Sample to Send (Qualification)

• Quantity: Same as a regular batch submission — 12-15 retail units
• Type: A batch you've already tested at the old lab with known results
• Shipping: Standard courier with chain of custody form. Note "qualification sample" on the form.

Expected Turnaround

Price Ranges

Country/Region Notes

• US: Same ISO 17025 requirements apply regardless of which lab you use. Transition between labs is purely a documentation exercise.
• Canada: If you switch from a Canadian to a US lab, ensure the lab's methods are recognized by Health Canada for NHP testing.
• EU: Switching between EU member state labs is straightforward — all national bodies (UKAS, DAkkS, COFRAC) are ILAC-recognized.
• Cross-border transition: Switching from a domestic to an international lab (or vice versa) adds shipping time and may require import/export documentation for samples.

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• Current lab issue: ☐ Price increase ☐ Slow turnaround ☐ Quality concerns ☐ Closing down ☐ Just shopping around
• Testing needed: [Same panel as current, or different?]
• Timeline: [When do you need the switch complete?]

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