How to read a standardization statement

A standardization statement is the single most quoted line on any branded ingredient specification, and the single most often misread. It usually looks something like “Standardized to minimum 95% piperine” — eleven characters of number and two words of chemistry, carrying a surprising amount of load. This is what each part of it is actually promising.

The marker is what is measured, not what the product is

The marker is the compound the assay looks for. On BioPerine® it is piperine; on a boswellia extract like 5-Loxin® it is AKBA, one specific boswellic acid among several the plant produces. A marker is chosen because it can be measured reliably and because it is believed to matter, and those two reasons are not always the same reason.

This has a practical consequence that catches people out: two extracts of the same botanical, standardized to different markers, cannot be compared on their percentages at all. A boswellia standardized to 65% total boswellic acids and one standardized to 30% AKBA are not 65% and 30% of the same thing. They are measurements of different things that happen to be expressed in the same unit.

The minimum is a floor, not a target

“Minimum 95%” means the supplier will not release material below 95%. It does not mean the material is 95%, and batches commonly run above it. That is good news for consistency and bad news for anyone reverse-engineering a dose: if you formulate assuming the label figure, you are formulating against the worst batch you are contractually entitled to receive, which is the correct thing to do.

Where a specification states a maximum instead of a minimum, it is usually a limit rather than a guarantee — a ceiling on something you do not want much of, not a promise of something you do.

The test method is the part that is usually missing

A complete standardization statement names the method: HPLC, UV, gravimetric, with the internal method code where one exists. Across this directory, almost none of them do. The catalogue reports what suppliers publish, and what suppliers publish is overwhelmingly the marker and the number without the method behind them.

That matters more than it sounds. UV and HPLC can return materially different figures for the same material, because UV reads a broader absorbance and HPLC separates the specific compound first. Two products both claiming 95%, measured differently, are not making the same claim — and neither supplier has said anything untrue.

This is why the compare page prints a comparability warning rather than lining two figures up silently, and why a missing method shows as a dash rather than being quietly assumed to match. Ask for the method before you treat two numbers as equivalent. It is a reasonable question and any supplier can answer it.

What to ask for

• The Certificate of Analysis for a recent production batch, not the specification sheet.
• The test method and, where one exists, its internal reference code.
• The basis: whether the percentage is on the dry extract, the finished powder, or a carrier-loaded grade. A 20% figure on the extract and on a blended powder are different materials.
• Batch-to-batch assay data over several lots, which tells you where inside the range material actually lands.

None of this is adversarial. It is the ordinary due diligence that turns a marketing figure into a specification you can formulate against — and every supplier who documents their material properly would rather be asked.