Most customers are not looking for "a cream"; they are looking for a fix: oily skin, breakouts, dryness. A store that makes the right product easy to reach, with filters by skin type and concern, sells more because it removes the hesitation that leads customers to ask, wait, and sometimes leave.
Product pages in this field must be honest and detailed: ingredients, how to use it, who it suits and who it does not. That honesty reduces returns and complaints, and builds the trust that lets a customer buy the next product without asking.
And cosmetics run out. A cream that lasts two months means the customer will need it again at a predictable time. A reminder at that moment — with a small discount — recovers sales that would otherwise go to whichever store appeared in her feed.