“If you wanted to change the regeneration potential of an organ, for example, you wouldn’t have to stimulate or suppress the activity of those neurons. Instead, you could just figure out what neurotransmitters are controlling proliferation and then get that chemical to those stem cells with targeted drug delivery,” …. I believe the answer is not pharmaceuticals…. In the case of neurotransmitters, many instances of imbalance are a result of lack of certain specific amino acids.. for instance, L glutamine helps restore the lining of the intestines, and the body will break down its own tissues in times of stress to supply the required amino acids for neurotransmitter production, in order of importance to the body functions, so muscle and soft tissue gets broken down and if not supplemented during times of stress with those aminos, the tissue does not repair itself, then you get things like “leaky gut” and other chronic illness