A concentration can describe an ingredient's amount when it is verified. By itself, it does not establish the performance of a finished formula.
Ask what the number measures
A headline might refer to a named ingredient, a solution or a blend. Without that context, two numbers on different products may not describe the same thing.
Even a clearly stated amount does not tell you everything about the ingredients around it, the directions or how the product will agree with you.
Do not turn position into arithmetic
You cannot reliably calculate a concentration from where an ingredient appears in a list. US labeling rules include exceptions to simple descending order.
The complete list is still useful. It lets you identify ingredients and compare formulas without pretending to reconstruct the recipe.
Our approach
We do not print a percentage we cannot verify. We publish the ingredient names, the product's role and its directions instead.
Read those details together. Choosing something practical for your routine is more useful than treating the largest number as an automatic upgrade.
Further reading: FDA: cosmetic labeling guide
Photography: Annie Spratt / Unsplash. Editorial photograph.