How ingredients are specified: marker compounds, assay methods, grade conventions, and what a percentage on a datasheet actually means.
The 85% on an SCI quotation is active content, not purity - the balance is declared free fatty acid and sodium isethionate. And noodles, granules and powder often share one specification sheet, so the paperwork cannot tell you which form you are getting.
Four of the five common organic UV filters are liquids, not powders, and their assay specifications legitimately exceed 100%. What that means for specifying a filter combination, reading a range, and comparing offers.
A 10:1 and a 20% by HPLC are not competing offers for the same thing. One describes a process, the other a content, and there is no conversion between them. How to read each, spot the native-ratio trap, and compare offers that mix the two.
Madecassoside is the glycoside of madecassic acid, one of the two principal triterpene glycosides in Centella asiatica. It is rarely sold alone: trade grades are usually a combined madecassoside + asiaticoside B assay, and the difference matters.
Asiatic acid and madecassic acid are the genins of asiaticoside and madecassoside - distinct molecules, not interchangeable percentages. How to specify them, what a free genins grade means, and the commercial grades available.
Gotu Kola and Centella asiatica are the same plant, but its grades are expressed in three incompatible ways. How to specify asiaticoside, madecassoside, asiatic acid and madecassic acid so your quotes are comparable.
