Brand plus a place name is the phrase that converts. It comes from somebody who has already been told what to buy and only needs to know who has it nearby.
Problem-led searches reach people earlier: dry skin, hair loss, joint supplements. They have not chosen a product, which makes the advice on the page the thing that decides the purchase.
The baby category is urgent and repeats. Formula and creams are searched at inconvenient hours by someone who needs them today and will not go far to find them.
The seasons are predictable to the week. Sun protection climbs from May, winter skin problems from November, and both reward pages that were already there.