They are. I went through pre-med for my postmortem science degree and am still close with my doctor/dentist friends from the program. They get kickbacks from companies if they successfully sell a brand. Sometimes the results are great, like Wakix (my Narcolepsy medication that actually helped), but other times, it’s a garbage product. If the medical professional has a fancy pamphlet or offers you coupons for the product, that means the company is paying them.