People without a medical background greatly exaggerate the ability of perception to alter bological function. These are the people who think prayer can cure their cancer so they forego chemotherapy. There are much more plausible explanations for placebo growth, as I previously mentioned. I was very happy when I started losing my hair. It came out of nowhere and was never expected. If changing my frame of mind, through reducing cortisol or whatever would have cured it then it never would've happened in the first place. This is pointless. When a hair loss drug actually works you will know. You won't have to debate endlessly about placebo effects and whether or not you see an improvement
And the same concept can actually be applied to the negative side effects of drugs, whereby people love to say ones sexual sides are "placebo bro" but if the only factor thats changed once someone started using a drug, was the use of the drug itself, and one of the side effects are sexual side effects, then its the drug that's the cause. I'm not mentioning any specific drug because there's a few we all know.