It's a scam. There have been various attempts at scalp injections for baldness- Pete Townsend tried it- look at his hair! And he has tons of money to spend. If it worked, Jason Statham and Bruce Willis would get their hair back. They do ok without it, but believe me, they would do it if it worked.
When you are curious, just put the type of treatment in google and put the words ripoff scam waste con next to it and see what comes up! I do this with people trying to sell me stuff and it works pretty well. While I realize that google has it's limits, this is one of the good things it does.