FGF21 (Fibroblast growth factor 21)

FGF21 (Fibroblast Growth Factor 21) is a hormone produced mainly by the liver that plays a key role in regulating metabolism. It helps control how your body uses and stores energy, influencing processes like fat burning, sugar balance, and insulin sensitivity. FGF21 levels can increase in response to fasting, exercise, or certain dietary patterns, and it’s being studied for potential treatments for obesity, diabetes, and metabolic disorders. Overall, FGF21 acts as a messenger that helps your body adapt to different metabolic states and maintain energy balance.