Percentile
The value below which a given percentage of a data set falls. The 90th percentile of declared doses for a compound is the dose that's higher than 90% of products declaring it, and lower than the remaining 10%.
Example
Compound pages with enough dose data (all except probiotics) have a "Where does your dose rank?" tool that looks up the whole-number percentile for any dose you enter, using the same underlying percentile data.