How to use this directory
Category pages cover when a step helps, when to skip it, and what to check before you open product cards. Product pages add formula notes, limits, and how that bottle fits a short routine.
Browse by category first if you are unsure you need the step. Use skin-type or concern filters only to narrow the list — concern filters stay on this hub; published concern guides live under Skin Concerns.
Same-category compare (from a card or a category page) is for reading differences in role and ingredients. Prices and ratings are not part of these notes. Purchase links appear only when a verified destination is active.