“Standardised” means the manufacturer adjusts the extraction process and verifies each production batch so that the finished extract powder contains a defined, repeatable range of the key marker compounds — primarily alliin (the stable precursor) and the allicin yield potential, plus related thiosulphinates. Without standardisation, a garlic powder or oil can vary tenfold in active content depending on the harvest, drying method, and storage time.
The 2 mg per capsule refers to the weight of this standardised extract powder, not to a guaranteed milligram amount of allicin. Allicin itself is volatile and short-lived; what the extract preserves is the alliin–alliinase system and the downstream thiosulphinates in a stable matrix that releases them predictably after ingestion. Reputable producers test each batch by HPLC or GC-MS against a reference standard and provide a certificate of analysis on request.
For you as a user, standardisation translates to reliability: the capsule you take in month three delivers the same sulphur-compound profile as the one you took on day one. It also means you are not paying for inert filler — the extract is concentrated specifically for those constituents. If you need the exact analytical specification (e.g., % alliin, allicin release potential), contact the brand’s customer service and ask for the current batch CoA; legitimate supplement companies will supply it.