Quality Control
Quality Control from Raw Material to Release
Certificates describe a system. Batch records describe a product. Here is the six-stage control chain every Yukang Medicine order passes through, and the documentation that comes out the other end.
Six Stages
The Control Chain for Every Batch
From approved supplier to released finished goods — no stage is skipped because an order is urgent.
Supplier Qualification & Purchase Control
Raw materials are only purchased from approved suppliers who provide a specification and their own Certificate of Analysis. New suppliers are qualified before the first commercial order.
Incoming Inspection & Quarantine
Every incoming lot is sampled, identified and held in quarantine until the incoming inspection is signed off. Released, rejected and on-hold material is physically segregated.
Dispensing & Line Clearance
Ingredients are weighed and dispensed against the approved batch record, and each line is cleared and verified before a new batch starts — preventing cross-batch mix-ups.
In-Process Controls
Weight, fill volume, hardness, seal integrity, appearance and piece count are checked during the run at defined intervals, with results recorded on the batch record as the batch is made.
Finished Goods Laboratory Testing
Samples from the finished batch go to the laboratory for assay, microbiological screening and heavy-metal testing against the specification agreed with you.
Release, COA & Retained Samples
Only after the batch meets specification is it released to the finished-goods store with its Certificate of Analysis. Retained samples are kept for the full shelf life for any later re-test.
Test Matrix
What We Test, and When
The tests that matter for dietary supplement compliance, mapped to the point in production where they happen.
| Test | What It Screens For | When It Happens |
|---|---|---|
| Ingredient identity | Verification that the delivered raw material is the material ordered — including botanical identity for herbal ingredients. | On receipt, before quarantine release |
| Assay / potency | Active content against the specification on your label, so the Supplement Facts panel is supported by data. | Finished goods, per batch |
| Microbiological limits | Total plate count, yeast and mould, E. coli and Salmonella as standard; additional organisms where the product or market requires it. | Finished goods, per batch |
| Heavy metals | Lead, mercury, arsenic and cadmium against the limits of your destination market. | Finished goods, per batch |
| Physical characteristics | Weight and fill uniformity, hardness and friability for tablets, seal integrity for sachets, sticks and pouches. | In-process, at defined intervals |
| Stability & shelf life | Accelerated and real-time studies supporting the best-before date printed on your label. | Per formula, at development and on change |
On the Floor
Quality Control Where the Product Is Made
Our quality team works on the line, not in a separate building. Checks happen while the batch is running, so a deviation is caught before it becomes a whole batch.
Paperwork
The Documentation Pack You Receive
What arrives with your shipment, and what stands behind your listing if a retailer, marketplace or customs officer asks a question.
Batch Manufacturing Record
The complete story of one batch: who dispensed what, which lines ran, which checks were taken and who signed each step off.
Certificate of Analysis
The document your retailer, importer or marketplace will ask for — issued per batch, against the specification you approved.
Specification Sheet
The agreed target values and limits for your formula, written before production starts so there is no argument about pass or fail afterwards.
Stability Report
The data behind your shelf-life claim, covering potency, appearance and microbial integrity over the storage period.
Deviation & CAPA Records
Anything that did not go to plan is documented, investigated and closed out — with corrective action recorded for the next run.
Compliance Pack for Import
The label, COA and supporting statements your importer or customs broker needs for FDA-regulated, EU, UK, Canadian or Australian entry.
Frequently Asked
Quality & Testing FAQ
Common questions from brand owners evaluating a contract manufacturer's quality system.
Do you test every batch or only sample batches?
Every production batch is tested and released against the specification agreed with you, and every batch ships with its own Certificate of Analysis. There is no 'representative batch' arrangement — if the batch number is on your carton, it has its own test result.
Can I nominate my own third-party laboratory for testing?
Yes. Many brands test retained samples at a laboratory of their own choosing, and US-market brands sometimes use a US-based lab for extra confidence. We will hold retained samples and ship them to your nominated laboratory on request.
What heavy-metal limits do you test against?
We test against the limits that apply to your destination market and product category — for example US dietary supplement limits, EU food supplement requirements, and the stricter limits some retailers impose on their own suppliers. Tell us your market and we will confirm the specification before production.
What happens if a batch fails a test?
Failed material never reaches the finished-goods store. Raw material that fails identity or specification is rejected and quarantined; a finished batch that fails release testing is held and either reworked against an approved deviation or destroyed. Either way the decision, the investigation and the corrective action are recorded.
Are your products tested for allergens and cross-contamination?
We control allergens through supplier declarations, line clearance procedures and segregation between production runs, and we declare allergens on the label as required by your market. If your product is free-from a specific allergen, tell us at the formulation stage so the raw material and line plan can be built around it.
How long are batch records and samples kept?
Retained samples and batch records are kept for the shelf life of the product, so any shipment can be traced back to its raw material lots and re-tested long after delivery. That traceability is what makes a recall — if one ever happened — a contained event rather than a brand-ending one.
Ask Us Anything About Testing
Send us your target market, product category and any retailer-specific limits, and our quality team will confirm the testing specification before you order. NDA protected.
Talk to Quality