What Goes Into CPSR Part B, the Safety Assessment

People often assume the Cosmetic Product Safety Report is one document that just gets filled in like a form. It's actually split into two very different halves, and the split matters because only one half requires a signature from someone with specific qualifications.

Part A is the evidence, Part B is the judgment

Part A of the CPSR is the data-gathering half: the full formula, physicochemical and microbiological characteristics, impurities, packaging material, normal and reasonably foreseeable use, exposure calculations, toxicological profile of each ingredient, and any existing undesirable effects data. It's thorough and factual, but it doesn't, by itself, tell you whether the product is safe.

Part B is where that data gets interpreted. A qualified safety assessor reviews everything compiled in Part A and writes a reasoned conclusion about whether the product, as formulated and as intended to be used, is safe for human health. That conclusion has to be justified, not just asserted. It's the difference between a spreadsheet of numbers and someone with the training to read those numbers and say what they actually mean for a person applying this product to their skin every day.

What the assessor actually has to weigh

A safety assessor working through Part B is looking at several things at once:

• Whether individual ingredients have known concentration limits or restrictions, and whether the formula respects them.
• Whether the combined exposure from all ingredients, given realistic use patterns, stays within safe margins.
• Whether the packaging could interact with the formula in a way that changes safety, for example through migration of substances from plastic into the product.
• Whether the labeled warnings and instructions for use are adequate given the product's risk profile.
• Whether there's anything about the specific population likely to use the product, such as children's products or products marketed for a sensitive area, that changes the risk calculation.

The assessor also has to state their reasoning, not just a pass or fail. A Part B conclusion that just says "safe" without explaining why doesn't hold up to scrutiny if a Responsible Person or market authority ever asks to see the file.

Why the qualification requirement exists

Under Regulation (EC) No 1223/2009, the person who signs Part B has to meet defined qualification criteria, generally a degree in pharmacy, toxicology, medicine, or a similar discipline, plus relevant experience. This isn't bureaucratic gatekeeping for its own sake. Reading a toxicological profile and correctly translating it into a real-world safety margin takes training that most product developers, however experienced, simply haven't had. A maker can absolutely compile excellent data for Part A. Very few makers are qualified to sign Part B themselves.

This is also why you'll sometimes hear that a CPSR can't be self-certified the way some other filings can. The signature on Part B is a professional judgment call, and the regulation ties it to a specific credential.

How Part A feeds Part B in practice

Good Part A work makes Part B faster and more defensible. If your formula documentation, INCI mapping, and concentration data are messy or incomplete when they land on the assessor's desk, the assessor either has to chase down missing information or make more conservative assumptions, which can mean requesting reformulation or additional testing. Clean Part A data, on the other hand, lets the assessor focus on the actual judgment call rather than data reconstruction.

A few things that consistently speed this process up:

1. A finished formula list with exact percentages, not ranges, wherever possible.
2. INCI names matched precisely, including any supplier blends broken down into their real components.
3. Any existing safety data on raw materials, including CAS numbers, gathered before the assessor starts rather than requested afterward.
4. A clear statement of intended use, application frequency, and target population.

Where this fits into the bigger CPNP picture

The CPSR, both parts together, lives inside the Product Information File alongside the formula, labeling, and manufacturing information. You need it in place, and the Responsible Person established in the EU needs to have it available, before you notify through the CPNP portal. Part B specifically is the piece that turns your PIF from a folder of paperwork into an actual safety justification a regulator can rely on.

If you're mapping out everything that has to be true before notification, Cosmetic Comply's ingredient matching can help get the Part A side in good shape, tracing every raw material to its INCI name and CAS number and flagging anything that looks restricted before it ever reaches an assessor's desk. Canada is live today, with the EU workflow on the way.