Lonza Formulation Orders: A Checklist Built From 7 Years of Mistakes

I've been handling Lonza API and custom formulation orders for seven years. In that time, I've made 23 documented mistakes that cost roughly $180,000 in wasted material, rework, and expedited shipping. I'm telling you this because the checklist below is the one I wish I'd had before the first mistake, not after the third one.

This is for anyone who works with a CDMO like Lonza and sees "formulation" or "API" in the product brief. If you're searching for "api lonza" because you need a manufacturing partner for an active pharmaceutical ingredient, the actual synthesis is only half the story. The other half is how you hand over the specification.

This isn't an introduction to Lonza formulation services. It's a checklist for the parts most people skip.

Who This Checklist Is For

Use this when you are:

• Submitting a raw material spec for a new API or custom formulation at Lonza.
• Reviewing a product brief that includes an ingredient like titanium dioxide.
• Reformulating a consumer product, e.g., "hair gel without propylene glycol," and need a CDMO to handle it.
• Getting ready to sign off on a GMP batch.

If that's you, here's the checklist. Seven steps, not fifty.

Step 1: Lock the "API Lonza" order before you talk about formulation

This sounds basic. I've watched a project go sideways because everyone kept saying "API Lonza" but nobody specified which molecule, which salt form, which particle size, and which pharmacopoeial standard applied. When you're ordering an active from a CDMO, the molecule name is not the specification.

For a generic API, include the monograph reference (USP, Ph. Eur., or JP) and the exact grade. For a proprietary or custom API, make sure the regulatory filing strategy is written down—who owns the DMF, who can reference it, and what route of synthesis is allowed. At Lonza, their formulation team can only work with what's written down.

Lesson learned: on a 400 kg order, I approved "API as per prior delivery" without checking the prior delivery. Turned out the prior delivery was research grade, not GMP. The batch failed in testing. About $27,000 down the drain.

Step 2: Read the SDS before you write the spec

This sounds like common sense and is almost always skipped. When I see "titanium dioxide msds" in an email, I know someone is trying to confirm two things: what it is, and whether it's hazardous. The answer to "is titanium dioxide mineral or chemical?" is both. It's a naturally occurring mineral (TiO2) that, once mined and processed, is sold as a chemical substance. It has an SDS because it's a manufactured chemical substance with specific hazards.

I assumed "titanium dioxide" was just a mineral and therefore safe. Didn't verify. Turned out the form we approved had different regulatory and packaging requirements than the form I'd assumed.

Don't stop at "it's natural." The hazard profile depends on form. The current document is a 16-section SDS, not the old MSDS. Under OSHA's Hazard Communication Standard (29 CFR 1910.1200), the SDS format has been mandatory since June 1, 2015. If someone sends you a document labeled "MSDS" without the 16 sections, ask for an updated SDS. In the EU, the CLP Regulation determines what hazard information must appear on the label. For respirable titanium dioxide powder, that can include a carcinogen class. I'm not a toxicologist, but the regulatory status still changes your spec and your packaging.

Step 3: Write "hair gel without propylene glycol" as a testable spec, not a wish

This is the one that catches brands all the time. A product brief says "hair gel without propylene glycol." Someone assumes that just means delete propylene glycol from the formula. But propylene glycol is doing three jobs in most hair gels: it's a humectant, it's a solvent for actives, and it's part of the preservative system's solubility. Remove it and the gel can turn cloudy, the preservative can stop working, or the product can dry out faster.

The worst part: "without propylene glycol" can mean different things. To us, it meant "zero PG on the ingredient label." To the formulator, it meant "no intentionally added PG." Those two are not the same if a raw material is supplied in PG as a carrier. I learned this on a consumer project, and the resulting 14-day stability failure cost us a launch slot.

If you're submitting this to a Lonza formulation team, write the requirement in a way that leaves no interpretation: "Product must contain no propylene glycol, and no raw material in the formulation may contain propylene glycol as a carrier." That's testable. "Should be PG-free" is not.

Step 4: Confirm GMP and regulatory classification before the quote

It's easy to send a raw material request and wait for pricing. But the regulatory path can change the whole project. For API Lonza manufacturing, ICH Q7 is the baseline for active ingredients. For excipients and finished products, there are different GMP layers. For a cosmetic like hair gel, the obligation is different from pharma. If you don't know which regulatory framework applies, say so early. The quote depends on it.

On one project, we asked for a cosmetic-grade preservative system and received a pharmaceutical-grade price. That wasn't Lonza's mistake. We hadn't specified the market, so they quoted the standard that is hardest to achieve. The better process is to send the target market, the dosage form, and the phase in a single request. That's how the efficient teams work.

Step 5: Treat the example formula as a starting point, not the answer

Everything I'd read about outsourcing formulation said a CDMO would handle the details. In practice, what you get is a starting point that must be tested in your packaging, at your scale, with your raw material lots. On a 1,200 kg run of a personal care product, the lab formula looked perfect. The commercial batch separated after two weeks. We later found that the lab had stirred for 20 minutes; the batch plant stirred for 40 minutes because the mixer was different. That's an $8,400 waste plus a three-week delay.

Now I send packaging samples, expected temperature range, and mixing time assumptions with every formulation order. I'd rather have the CDMO tell me "we don't need that" than not have it.

Step 6: Build in a verification step for every incoming batch

Efficiency doesn't mean blind trust. We've caught 47 potential errors using a simple pre-check in the last 18 months: every incoming batch gets an ID check, a label check, and a retained sample. It sounds boring. It works.

The most expensive mistake was a batch that came with a certificate of analysis for the right material but the wrong lot number. If we'd sampled it, we would have caught it. Instead, we released it and then had to rework 1,600 kits. That's the kind of error that makes you want to leave the industry. I didn't, because I realized the process, not the people, was the problem.

Step 7: Put all decisions in one shared spec document

We used to keep raw material details in emails, and the "no propylene glycol" requirement was stuck in a product brief that changed five times. That's how errors happen. Once we moved to a single controlled document with every spec and each revision dated, our reorder cycle time dropped from 5 days to 2 days. The gain didn't come from fancy software. It came from not making the next person ask "which version is current?"

Fewer handoffs means fewer errors. I'm convinced of that. But that opinion comes from 40+ orders, not from a textbook.

What I still get wrong

Let me not sound like I've arrived. Last year, I added "titanium dioxide" to a specification without specifying rutile versus anatase. The supplier assumed anatase because it was cheaper. The final formulation changed color. It took me three years and about 40 orders to understand that "same name" is not "same material."

Take this with a grain of salt: roughly one in five raw material headaches comes from the requester's spec sheet. In my experience, that's more common than people expect. I've been on both sides.

The One-Minute Version

• API specification includes molecule, salt form, particle size, monograph, and GMP grade.
• Current 16-section SDS for every chemical ingredient, including titanium dioxide, is checked before the order.
• "No propylene glycol" is defined in writing with a testable statement.
• Regulatory path is confirmed before quoting.
• Lab formula is tested under production-like conditions.
• Incoming batches get ID, label, and retained sample checks.
• One shared document contains all specs and revisions.

That's the whole checklist. It isn't clever. It's just the result of enough expensive mistakes.