Answer:
Eating enough protein is important for hair growth because hair follicles are made of mostly protein, and lack of protein in the diet would promote hair loss. Biotin is essential for the production of a hair protein called keratin, biotin supplements are often marketed for hair growth.
Hope this helps!!!!!
Epinephrine is the answer you're looking for. A more common and more used terms would be adrenaline.
I think that you are 13-15 I’m still typing have a food day if your reading this