There was a talk in DEFCON about different substances that could stimulate neurogenisis and potential risks. The speaker mentioned the 1986 Nobel laureate Rita Levi-Montalcini who found NGF gave herself some dosage of NGF. The lady lived to 103 years old but the remarkable thing is that she is very productive in very old age. Later I found those peptids are extremly expinsive for normal people to consume
https://www.youtube.com/watch?v=KPwjn17XQfs