Norepinephrine is a chemical in our bodies that acts as a messenger, helping to transmit signals between nerve cells. It plays a key role in regulating our mood, attention, and the body's response to stress and danger. Full definition
Catechins work by increasing levels of norepinephrine in order to promote fat burning, the most potent of Catechin is ECGG, it's been shown to kickstart enzymes that trigger adipose cells to release fat. (leanbeanofficial.com)
[2] Taking the amino acid l - tyrosine, a precursor of catecholamines, can increase depleted levels of norepinephrine in the brain, reducing stress and anxiety and improving mood and performance. (ahealthblog.com)
They tested the idea by either injecting healthy mice with adrenaline or exposing them to fox urine, both of which increase norepinephrine levels in brain. (hopkinsmedicine.org)