The recipe begins
before the jar.
Species, plant part, harvest, processing and storage can matter as much as the preparation method. “Natural” is not a quality specification.
Identity first
Use the accepted botanical name, the intended plant part and a supplier that can trace the material. Common names can refer to more than one species.
Ask what happened before purchase
Origin, cultivation or wild-harvest practice, harvest date, drying conditions, milling and storage all affect the final material. Concentrated extracts also need a clear extraction ratio and solvent description.
Look for proportionate testing
The relevant checks depend on the plant and product. They may include identity testing, microbial limits, pesticide residues, heavy metals, foreign matter or adulteration. A certificate is useful only when it refers to the actual batch.
Store like ingredients matter
Keep botanicals dry, labelled, protected from light and separated from household chemicals. Discard material with mould, insects, unexpected moisture, rancid odour or an uncertain identity.
Do not rescue uncertain material
When the species, plant part, contamination status or storage history is unclear, the safest preparation method is not to use it.