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(PubMed) Caprio AM, Umano GR, Luongo C, et al

Hepatocyte growth factor (HGF) binds to the c-Met receptor on neurons, triggering downstream signaling cascades that promote cell survival, axon growth, and the formation of new synapses

A loss of red blood cell production will create symptoms of low energy and inability to concentrate

Fast forward 25 years and this new model of performance enhancers are, in some cases, just as difficult to detect but as easy to purchase as clicking a few buttons on a computer

However, while you can get them through natural sources, some people are still not getting enough vitamin B12 daily (like vegetarians or vegans)