Source? which studies prove this?
Also most clinics i've visited either refuse to reveal their formulation (which is pretty damn stupid and you shouldn't give them your money) or are using simply water for injection. A liposomated alternative for injection exists but I don't have the details.
It's petty simple
If they inject at 4mm they use saline solution. If they use dermapen at 2mm (like Dr Pelo, the most popular and the one with best results) they use trichosol.
Anyways, you can do this yourself. It's 100% exactly the same as paying a clinic