What to Do When Your Manufacturer Changes an Ingredient Source
An unannounced source change is usually discovered through a complaint, not a notification. If the product has changed, something upstream changed. Here is how to establish what happened and prevent it being possible again.
How This Usually Comes to Light
This guide is for brand owners using third party manufacturing in India.
The typical sequence is that complaints or reviews start mentioning a difference: the colour is darker, the smell is stronger, the powder dissolves differently, the capsules look different. Nothing has failed a test, so nothing was flagged.
Behind that is often a change in raw material source, a change in extract supplier, or a substitution within a specification the manufacturer regarded as equivalent. From their perspective nothing was wrong; from yours, the product your customers reorder has changed.
Establishing What Changed
Work through this sequence.
- Identify the batch where complaints began, from your complaint log.
- Pull certificates of analysis for that batch and several before it.
- Compare values line by line, looking for shifts in assay, moisture, colour or physical properties.
- Compare the retained reference sample against a unit from the new batch, side by side.
- Ask the manufacturer directly and in writing whether any ingredient, supplier or process changed.
- Request the raw material certificates for the inputs used in both batches.
- Establish whether the change is within your agreed specification or outside it.
Two Different Situations
The response depends on which applies.
| Situation | What It Means | Response |
|---|---|---|
| Change outside specification | A specification breach | Formal issue; invoke the agreement; consider the batch’s disposition |
| Change within specification | No breach, but a real product change | Tighten the specification so the variation is no longer permitted |
The second case is the more common and the more instructive. If a change you consider material was permitted by your specification, the specification was not tight enough. That is a fixable problem.
What Needs Re-Testing
Do not assume existing data still describes the product.
Stability
If an input source changed, previous stability data describes a product made with different material. Regenerate it.
Full Assay Panel
Run the complete panel on the new batch, not a reduced one, to establish where it sits.
Physical Properties
Disintegration, solubility, viscosity and texture as relevant. These shift most with source changes.
Sensory
Formal comparison against your retained reference, on appearance, smell and taste.
Preventing Recurrence
The structural fix is change control, and it needs to be written.
A change control clause requires your written approval before any ingredient, supplier or process change. It is rarely refused when asked for, costs nothing, and converts this entire category of problem into a notification rather than a discovery.
Alongside it, tighten the specification where this incident showed it was loose. Add the parameter that moved, with a limit narrow enough that a material change cannot occur within it. And keep a retained reference sample from a batch you are satisfied with, refreshed periodically, so comparisons are possible.
Response Checklist
Use this sequence.
- Identify the first affected batch from your complaint log.
- Compare certificates of analysis across recent batches.
- Compare a new unit against your retained reference sample.
- Ask the manufacturer in writing what changed.
- Request raw material certificates for both batches.
- Determine whether the change breached your specification.
- Run a full assay and physical property panel on the new batch.
- Regenerate stability data if an input source changed.
- Tighten the specification on the parameter that moved.
- Secure a written change control clause if you do not have one.
- Refresh your retained reference sample and note the batch it came from.
- Record the incident and the fix in the product file.
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Frequently Asked Questions
How do I find out an ingredient source changed?
Usually through complaints or reviews mentioning a difference in colour, smell, texture or dissolution, because nothing failed a test so nothing was flagged. Establish the facts by comparing certificates of analysis across recent batches before raising it.
What if the change was within my specification?
Then there was no breach, but there was a real product change, which means the specification was not tight enough. Add the parameter that moved, with a limit narrow enough that a material change cannot occur within it.
Does existing stability data still apply after a source change?
No. The previous data describes a product made with different input material, so stability should be regenerated in your actual pack alongside a full assay and physical property panel on the new batch.
How do I prevent this happening again?
A written change control clause requiring your approval before any ingredient, supplier or process change. It is rarely refused, costs nothing, and turns this category of problem from a discovery into a notification.
Why keep a retained reference sample?
Because without one, side-by-side comparison is impossible and you are left arguing about recollection. Keep a sample from a batch you are satisfied with, note which batch it came from, and refresh it periodically.