Answer first
Go into a hair consultation with a few questions: what is likely causing my thinning, what realistic change can I expect and by when, what exactly is included and what it costs over a year, and when should I see a doctor instead. A good consultant answers plainly and doesn't push you to decide on the spot.
About the cause
What do you see on my scalp? Should I get a blood test first?
About the plan
What would you start with, and why? How will we measure progress?
About cost and comfort
What's the total over a year? What are the side effects to watch for?
Questions
Can I bring someone?
Yes, a family member or friend is welcome.
What should I bring?
A list of products and medicines you use, and any recent blood test results.