FGF-21

FGF-21 (Fibroblast Growth Factor 21) acts as an endocrine hormone regulating metabolism, particularly glucose and lipid homeostasis. It is a promising therapeutic target for metabolic diseases like type 2 diabetes and non-alcoholic fatty liver disease.

In the literature, FGF-21 appears most often in work focused on metabolism, blood sugar and fat loss. Studies in this area tend to look at mechanisms and observed effects in laboratory and preclinical settings rather than outcomes in people, so the picture is best read as a map of where researchers have been curious — not as evidence of any benefit.

Because it is catalogued here under powder peptides, FGF-21 also shows up in discussions of insulin sensitivity. Coverage across those topics varies widely in quality and depth, and much of it is early-stage. Reading the underlying research directly is the only way to judge how strong any particular finding is.