An INCI list is a legal document, not a marketing one, which makes it the most honest part of most packaging. It still needs reading carefully.
Order and the 1% line
Ingredients are listed in descending order of concentration down to 1%. Below that, they can be listed in any order. So an ingredient sitting after the preservative is almost certainly present below 1%, which is fine for a potent active and meaningless for a botanical extract being sold as the hero.
Where actives usually sit
Niacinamide at a meaningful level appears early. A peptide complex will appear late and that is normal, because peptides work at very low concentrations. Learning which is which is most of the skill.
Fragrance hides in several places
Parfum is the obvious one. Essential oils are listed by their botanical name and are functionally fragrance for the purposes of irritation. A product marketed as unscented can still contain a masking fragrance.
What a list cannot tell you
It cannot tell you the pH, the exact concentration of anything above the 1% line, whether the vehicle actually delivers the active into skin, or whether the formula is stable. Those are formulation questions, and the only real answer is a brand willing to publish the numbers.
What we publish
The concentration of every active that matters, the pH where it is relevant, and the full list on the carton rather than only online. If a number is missing from one of our pages, ask and we will either publish it or explain why we cannot.