How to Vet Your First Contract Manufacturer

Handing your formula to someone else's production line is a leap of faith, and the first time you do it, it's easy to focus on price and turnaround while skipping the questions that actually protect you. Here's what to ask before you sign anything.

Ask for the GMP certification, not just a claim of it

Good manufacturing practice for cosmetics has a real standard behind it: ISO 22716. A manufacturer that follows it should be able to produce an actual certificate, or at minimum walk you through their quality management system in specific terms rather than a general "we follow GMP" line. If a manufacturer can't point to a documented system covering things like batch records, equipment cleaning validation, and personnel hygiene, that's worth pausing on regardless of how good their sample looks.

Questions worth asking directly:

• Is your facility ISO 22716 certified, or audited against it by a third party?
• Can I see a redacted batch record from a past production run?
• Who signs off on a batch before it ships, and what does that review cover?

Check who's actually responsible for the ingredient list

This is the part first-time founders skip. A contract manufacturer supplies the raw materials in many arrangements, which means they're the ones who know the real INCI names, CAS numbers, and exact percentages, not you. Before you sign, get clear on:

• Will they give you a full INCI breakdown with percentages for every batch, or just a general spec sheet?
• If they change a supplier for one raw material, will they tell you, and will the percentage change?
• Who is the "responsible person" or notifier of record for regulatory purposes, you or them?

That last question matters more than it sounds. In Canada, someone has to file the Cosmetic Notification Form within 10 days of first sale, and that filing needs accurate INCI names and concentrations. If your manufacturer swaps a preservative supplier without telling you, and you've already filed based on the old formula, you're technically out of compliance with a filing that no longer reflects the product.

Ask for references from a brand your size, not their biggest client

A manufacturer will happily connect you with a large, established client if you ask for a reference, but that doesn't tell you much about how they'll treat a small first order. Ask instead for a reference from someone who does a comparable order size to yours. Questions to put to that reference:

1. How did they handle a formula problem or an out-of-spec batch?
2. Were minimum order quantities honest, or did they creep up after the first run?
3. How long did lead times actually run compared to what was promised?

Request a real sample run before committing to full production

A benchtop sample and a production-scale batch can behave differently, especially for emulsions. Ask for a small pilot batch at or near production scale before you commit to a large first order. Check:

• Does the texture, scent, and color match your approved sample?
• Does the pH sit where it should, and did they test it?
• Is the packaging fill consistent, and does the product perform the same after a few weeks on the shelf?

Get the paperwork trail sorted before the first batch ships

Once you've chosen a manufacturer, make sure you're getting, per batch: a certificate of analysis, an ingredient list with real percentages (not just the top few actives), and any safety data sheets for materials that need them. This is the raw material you'll need anyway to notify the product, so it's worth building the habit of collecting it from day one rather than chasing it down later when a filing deadline is close.

If your manufacturer hands you an ingredient list that's light on percentages or full of trade names instead of INCI names, Cosmetic Comply can take what you have, map it to INCI names and CAS numbers, expand any supplier blends, and flag anything that needs a closer look before you file, which takes some of the pressure off getting a perfect document from a new manufacturing partner on the first try.