A raw material result cannot automatically be used as the finished product result. Once an ingredient enters a formulation, concentration, matrix effects, packaging, manufacturing and storage can change what should be tested and how the result is interpreted.
Raw material testing
Ingredient testing may address identity, assay, purity, contaminants or a supplier specification. For peptide ingredients, this can include MS identity, HPLC purity, quantitative content and selected safety tests.
Finished product testing
A finished cosmetic may require physical and chemical parameters, microbiological testing, stability or compatibility work, restricted-substance checks, safety assessment support or claim-related efficacy testing. The appropriate scope depends on product type and market.
Matrix effects
Oils, surfactants, preservatives, pigments and other formulation components can affect extraction and instrument response. A method suitable for a neat peptide may not be suitable for a cream or serum without adaptation and validation or verification.
Build a proportionate test plan
Start with product category, ingredient list, claims, manufacturing location, target market and the decision the report must support.
- Confirm the exact sample stage
- Identify mandatory or customer-specific requirements
- Select a laboratory with the relevant current scope
- Agree methods, limits and reporting language before testing
- Treat raw-material and finished-product evidence as related but separate