- Vitamin C assay (HPLC or titration)
- Ascorbic acid by HPLC or titration, stated as a percentage of the powder. The method should appear on the COA.
- Identity
- Organoleptic checks and an HPLC or HPTLC profile compared with acerola reference material, to catch blending with synthetic ascorbic acid.
- Heavy metals
- Lead, arsenic, cadmium and mercury by ICP-MS, checked against the buyer's limits and any Prop 65 exposure targets.
- Microbiology
- Total plate count, yeast and mold, E. coli and Salmonella (often Staphylococcus aureus too).
- Physical tests
- Loss on drying, mesh or particle size, bulk density, color and odor against the spec. Record the carrier and its percentage.