Can fasting for 16 hours and in combination with exercising at the end of fast help stimulate growth hormone?

No, this is unlikely to stimulate hair growth. Prp is effective, but I have a very specific protocol, every 3-4 weeks for 6 months with prp therapy. I also add in progesterone to speed the healing process.  After that the injections are tailored down. You should also be on viviscal and other growth promoting ingredients. Cost will vary. See an expert for a formal evaluation. Best, Dr. Emer

Intermittent fasting increases growth hormone secretion, it also decreases the hormone leptin levels which boosts testosterone levels. So yes, done right intermittent fasting stabilizes blood sugar levels, improves cellular metabolism, helps with weight loss, increases anabolic hormones  and long term it is associated with longevity.I’m not sure drawing blood at the end of fasting and injecting PRP will make a difference.

This is unlikely to have any benefit at all. I would recommend against that at present based on what we understand.