An excess of omega-3s caused mice to go bald.

Researchers from China and the United States accidentally noticed that mice whose diet is rich in fish oil lose hair. An in-depth study showed that a protein that binds fatty acids and is expressed in skin macrophages is to blame. It sets off a cascade of reactions that causes other macrophages to accumulate around the hair follicles - this causes inflammation and hair loss. Thus, fish oil in large quantities can hardly be considered beneficial for hair loss.