Batch release is the documented check that confirms a manufactured batch meets its specification before it ships. For a skincare brand in New Zealand or Australia, that means holding a Certificate of Analysis, microbiological results inside ISO 17516 limits, a retained sample and a traceable batch record for every batch you sell.
Most indie founders think about testing at the formulation stage — stability, preservative efficacy, packaging compatibility — and then assume the hard part is over. It isn't. Those tests qualify the formula. Batch release qualifies the stock. They're different jobs, and the second one repeats every time you manufacture.
This is the part of the process that quietly decides whether a retailer will take you on, whether your insurer will cover you, and whether you can answer a regulator in a week rather than a panicked month.
What is batch release in cosmetic manufacturing?
Batch release is the formal decision that a finished batch is fit to sell. Someone competent reviews the evidence, signs it off, and only then does the stock leave quarantine.
The evidence usually covers four things:
- Manufacturing record — what was weighed, by whom, at what temperature, for how long, with which raw material lot numbers.
- In-process checks — pH, viscosity, appearance, odour, sometimes specific gravity, recorded against target ranges.
- Finished product testing — microbiological results, plus any physical or chemical specification your product needs.
- Retained sample — a sealed unit from the batch, kept so you can investigate later if something goes wrong.
Under ISO 22716, the international GMP standard for cosmetics, batch records, retention samples and finished-product release are all explicit requirements — and they sit alongside your wider New Zealand product safety and compliance obligations. The underlying principle is simple: for any batch on the market, you should be able to reconstruct exactly what happened.
What should a cosmetic Certificate of Analysis include?
A Certificate of Analysis (COA) is the one-page summary of that evidence. A COA that will survive a retailer's compliance review should show:
- Product name and formula or item code
- Batch or lot number, and manufacture date
- Batch size and best-before or expiry date
- Each tested parameter, its specification range, and the actual result
- Test method referenced (for example ISO 21149 for aerobic bacteria, ISO 16212 for yeast and mould)
- A pass or fail conclusion
- Name, signature and date of the person releasing the batch
Be wary of a "COA" that lists results with no specification alongside them. A number on its own proves nothing — the point is that the number sits inside a limit you set in advance.
Which microbiological limits apply to my product?
ISO 17516 is the reference standard for microbiological limits in cosmetics, and it splits products into two categories.
Category 1 — products for children under three, the eye area, and mucous membranes:
- Total aerobic mesophilic count: not more than 100 CFU/g or CFU/mL
- Yeast and mould: not more than 10 CFU/g or CFU/mL
Category 2 — all other products:
- Total aerobic mesophilic count: not more than 1,000 CFU/g or CFU/mL
- Yeast and mould: not more than 100 CFU/g or CFU/mL
In both categories, specified organisms must be absent: Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli and Candida albicans.
If you're formulating a baby balm or an eye cream, you're in the tighter category — worth knowing before you design the preservative system rather than after.
Do I need to test every single batch?
Not always, and this is where a good formulation partner saves you real money.
Water-containing products — creams, lotions, serums, cleansers, toners — should be micro-tested every batch. They can support microbial growth, so every batch is a fresh risk.
Anhydrous products — balms, facial oils, solid cleansing bars, powders — carry a much lower risk. Many manufacturers move these to a reduced or periodic testing regime once several batches have been shown to be reliably clean, with the rationale documented. That is a legitimate, risk-based approach, but it has to be written down and justified, not simply assumed.
Note that batch micro testing is a different exercise from preservative efficacy (challenge) testing under ISO 11930. Challenge testing is done once per formula, on a deliberately contaminated sample, to prove the preservative system works — we charge NZ$1,200 per formula for it. Batch micro testing is done on production stock to confirm that this particular batch is clean. You need both, and one does not replace the other.
What records do I have to keep in New Zealand and Australia?
In New Zealand, cosmetics sit under the EPA's Cosmetic Products Group Standard. You must keep a record of your group standard assignment and make it available to a HSNO enforcement officer on request — and since the rule changes that took effect on 1 January 2026, the standard's scope has widened to capture cosmetic products containing a hazardous substance even where the finished product itself isn't classified as hazardous. Schedules 4–8 (prohibited ingredients, restricted ingredients, colorants, preservatives and UV filters) have also been aligned more closely with European rules, and PFAS are being phased out on a staged timeline.
In practice, that shifts weight onto your raw material documentation. Your supplier COAs and specifications are how you demonstrate that what went into the batch is still permitted — so keep them filed alongside the batch record, not in a supplier's inbox.
In Australia, ingredient introductions are handled through AICIS, which has its own record-keeping obligations. Batch-level records aren't a substitute for AICIS compliance, but they're what makes it provable.
A workable retention rule of thumb: keep batch records and retained samples for the shelf life of the product plus one year. For a 24-month shelf life, that's three years.
How does this fit into a product launch?
At The INCI Lab, batch documentation is built into the manufacturing stage of the Pathfinder Framework, not bolted on at the end. Whether you come through The Accelerator (4–6 months, starting from $2,000) or The Visionary (9–12 months, starting from $4,000, with full IP transfer to you), you finish with a specification for your formula and a COA for the batch we make — at MOQs of 100–500 units, not 5,000.
That specification is yours. It travels with your IP, which matters if you ever move manufacturing or add a second production partner.
Frequently asked questions
Does my manufacturer provide the Certificate of Analysis, or do I need a separate lab?
Your manufacturer should issue the COA for the finished batch, drawing on in-house checks and results from an accredited third-party microbiology lab. You shouldn't have to arrange that yourself.
How long does batch release take?
Microbiological testing needs an incubation period, so allow roughly 5–7 working days from the end of manufacture before stock is cleared. Build this into your launch date — it is the step founders most often forget.
What happens if a batch fails its specification?
The batch stays in quarantine while the cause is investigated. Depending on the finding, it may be retested, reworked, or written off. This is exactly why retained samples and full batch records exist.
Do I need a COA to sell to retailers or on marketplaces?
Increasingly, yes. Most New Zealand and Australian retailers ask for a COA, a safety assessment and an ingredient list during onboarding, and several marketplaces now request the same.
Is a COA the same thing as a safety assessment?
No. A safety assessment evaluates whether the formula is safe for its intended use — once, for the formula. A COA confirms that one specific batch met its specification. Retailers usually want both.
Can you review the batch documentation from my existing manufacturer?
Yes. Ask The Chemist ($150 for 30 minutes) is often enough to tell you whether the paperwork you're being given would hold up.
Where to start
If you're about to manufacture your first batch, ask your manufacturer one question before you commit: what will my COA show, and what specification are you releasing against? A clear answer tells you a great deal about how the rest of the relationship will go.
We work with indie brands across New Zealand and Australia, with compliance documentation for NZ/AU, EU and US markets, and cruelty-free, vegan and fragrance-free capability as standard. Book a discovery call and we'll map out what your product needs.
