Short answer: custom formula development is a five-stage pipeline — brief, bench, iterate, verify, scale up — and almost every stalled project stalls for the same reason: the brief was a mood, not a specification.
"ODM" gets sold as a black box: hand over an idea, receive a product. In reality it is an engineering project with defined stages, defined inputs, and a small number of well-known failure points. This article walks the pipeline as it actually runs, so you can tell at any moment which stage you are in and what the stage needs from you.
The five stages of development
| Stage | What happens | Key input from you | Typical duration |
|---|---|---|---|
| 1. Brief | Requirements become a specification | Target user, texture class, actives, market, price band | Days, if the brief is complete |
| 2. Bench | Chemists build candidate formulations | Priorities when trade-offs appear | 2–3 weeks full custom |
| 3. Iterate | Samples go back and forth | Consolidated, concrete feedback | 1–3 rounds |
| 4. Verify | Stability, compatibility, preservation checks | Frozen formula — no more changes | Weeks, market-dependent |
| 5. Scale up | Lab batch becomes a production batch | Pack confirmation | Before the 10–15 day production window |
The durations overlap in practice — verification planning starts during iteration — but the dependency order is strict. You cannot verify a formula that is still changing, and you cannot scale up a formula that has not been verified.
Stage 1: what a real development brief contains
The brief is the highest-leverage document in the whole project. A usable brief states:
- Product form and texture class. "A lightweight gel-cream that disappears under makeup" is usable. "Premium feeling" is not.
- Actives and target ranges. Which actives, at what levels, and which are negotiable when cost or stability pushes back.
- Destination market. Compliance routes differ by market, and the market decides which preservative systems, filters and claim wordings are even possible.
- Price band and retail positioning. A formula engineered for a premium texture budget is a different formula from one engineered to hit a volume price.
- What you already have. Existing brand restrictions — free-from claims, fragrance policy, packaging already sourced — shape the bench work from day one.
A brief with these five items usually survives to production with minor edits. A brief missing them generates revision rounds that look like lab problems but are actually unresolved decisions.
Stage 2 and 3: bench work and iteration
At the bench, the chemist works inside real constraints the brief cannot fully express: pH windows that keep actives stable, emulsifier systems that survive the chosen pack, preservative systems legal in the destination market, and raw material costs that keep the FOB inside your band. Trade-offs are inevitable; what matters is who resolves them. State your priority order in the brief — texture over cost, stability over scent load — and the bench can make those calls without a round trip.
Iteration then runs on concrete feedback. "Thicker, less sticky, cooler scent" gives the lab three variables to move at once. "Increase viscosity roughly 20%, cut fragrance by a third" gives them one revision that lands. This is the difference between two productive revision rounds and five wasted ones.
Stage 4: the verification gate
Before a formula is production-ready it has to survive its own evidence programme: accelerated and real-time stability testing under conditions matching the destination market's climate, compatibility with the actual pack, and preservation challenge testing.
The rule that matters most here is the one brands break most often: the formula freezes when verification starts. Swapping an emollient or a thickener after verification begins changes the pH trajectory and the pack interaction — which means the affected tests restart. Late formula changes are the single most expensive thing a brand can do to its own timeline.
Stage 5: scale-up — where lab performance has to survive the factory
A formula that performs at one-litre bench scale can behave differently at hundreds of litres. Mixing energy, heating and cooling curves, and order of addition all shift slightly at scale, and the lab compensates by running a pilot batch before the production run.
Scale-up is also where the pack finally enters the loop: the first units off the filling line are checked against the golden sample — texture, colour, fill weight — before the line ramps. After that gate passes, mass production typically runs in 10 to 15 days depending on the manufacturing system, with the emulsion floor around 1,000 pieces per SKU and higher floors for surfactant, stick and powder systems.
Five places development projects stall
- The moving brief. New ideas arriving mid-project. Every new idea is a new bench cycle; park them for version two.
- Unowned trade-offs. When stability requires cutting the active from 3% to 2%, someone must decide. If nobody has been named, the project waits.
- The pack chosen last. The pack constrains the formula as much as the formula constrains the pack. Choose them together, or re-verify late.
- Verification treated as optional. Skipping or shortening the verification gate does not remove risk — it moves the failure to your customers' hands.
- Unrealistic calendar math. Full custom from a blank brief runs about 25–40 days to first lab samples; derived work from an existing base is far quicker, with samples typically out within 7 days. Planning a launch on the shorter number for a true custom project is a self-inflicted delay.
FAQ
Q: How long does custom cosmetics formulation take? A: Full custom development from a blank brief typically runs 25–40 days to first lab samples. Deriving from an existing documented base is much faster, with lab samples typically available within 7 days. Verification and iteration then sit between samples and mass production.
Q: What should a formula development brief include? A: Product form and texture class, actives with target ranges, destination market, price band and retail positioning, and any brand restrictions such as free-from claims or fragrance policy. The destination market matters because it determines which preservatives, filters and claim wordings are compliant.
Q: Can the formula be changed during stability testing? A: No. Any change to thickeners, emollients, emulsifiers or the preservative system alters the pH trajectory and pack interaction, which restarts the affected tests. The formula freeze at the start of verification is the most important milestone in the whole project.
Q: Who owns the formula after ODM development? A: With a properly structured ODM engagement, the developed formula is your asset and documented accordingly. This is one of the terms worth confirming in writing before the bench work starts, not after the product is on shelf.