A 20% caffeine assay confirms concentration; it does not establish that a guarana extract is clean, authentic or suitable for a finished oral pouch. Contaminant control needs its own risk-based specification and sampling program.
Heavy metals
Botanical materials can accumulate lead, cadmium, arsenic and mercury through soil, water, processing or handling. Limits should reflect the destination market, daily serving and ingredient contribution. A generic “heavy metals: pass” line is weak evidence without analytes, methods, limits and numerical results.
Pesticide residues
The relevant panel depends on agricultural origin and supply-chain history. Multi-residue screening can be useful, but procurement should confirm that the laboratory method and reporting limits cover the compounds and regulatory limits that matter for the intended market.
Residual solvents and processing aids
Extraction method matters. Review declared extraction solvents, carrier materials and appropriate residual-solvent limits. An aqueous extract and an extract produced with organic solvents do not have identical risk questions.
Microbiological quality
Incoming botanical extract, cellulose, flavors and the finished moist system each contribute risk. Specifications commonly address total counts and objectionable organisms based on product type and market. Water activity, hygiene and packaging controls support microbiological stability; end-product testing alone cannot compensate for a weak process.
Identity remains a separate test
USP’s work on guarana standards uses caffeine together with characteristic flavonoid markers and chromatographic profiles. A powder containing caffeine is not automatically authentic Paullinia cupana. Identity, potency and contamination are three separate quality questions.
Sampling and supplier qualification
Test the actual lot, connect the result to traceable batch records and retain samples. Trend suppliers over time and require change notification for origin, extraction site, solvent, carrier or method. Verification frequency can be risk-adjusted only after credible history is established.