You would make a tea with the powder. Then, if you filtered the solids left after and evaporated the water, the residue would be an extract. Extracts are usually more potent than just turning into powder the interesting part of the plant.
I think people have pre-dispositions to pfs. I don’t think the damage is irreversible although for some, the time and right, ideal conditions have to be tuned in even further.
I’m currently studying brain cell regeneration in the Hyppocampus area. People can say there is damage elsewhere in the body but in my opinion, considering that people get pretty much in the same state with anti-depressant, whatever drug was taken unbalanced the neural and endocrine system (the guts having lots of neurons as well as most of the serotonin) and that is the source of it all.
Initially it could be too much serotonin (with SSRI) or not enough GABA (with fin) but the end result is the Hypophysis and Hypothalamus are not regulated and those are the ones regulating hormones, neurotransmitters (Enzymes, neuropeptides, neurosteroids etc…). So from that point on, it’s like having a truck driven by a monkey. Our hormones and neurotransmitters range all over the spectrum until we get stuck in an uncomfortable, somewhat stable balance that is easy to upset.
Good news, I believe specific diets, exercises and supplements can be undertaken to correct the imbalances, generate new cells in the Hyppocampus area and improve the overall health. If I was in the US, I would visit a Daniel Amen clinic. He does brain scans (as a matter of fact, he’s the world’s leading psychiatrist doing brain scan) and has a balanced approach to fix the problem that mostly focus on diets, exercise and supplements, along with some changes in attitudes and thinking habits, leaving drugs only for the most urgent and extreme symptoms.
I suggest doing some research on Dr. Daniel Amen. There’s a lots of videos, articles and books by him.