Nutritional agent for reinforcing brain, protecting eye and strengthening body and preparation method and application thereof

The invention relates to a nutritional agent for reinforcing brain, protecting eye and strengthening body and a preparation method and an application thereof. The composition of the nutritional agent is scientific; ratio is reasonable; and the functions of reinforcing brain, protecting eye and strengthening body are maximized. The multiple theoretical functions of the composition are synergistic and have practical value. According to the invention, DHA algal oil, theanine, blueberry powder, xanthophylls, vitamin C, zinc and collagen are combined as a whole for the first time. Efficacy of the main functions is remarkably enhanced; the multiple theoretical functions produce practical value; and more maximized daily regimen is realized. Multiple forms of preparations which are convenient to eat and easy to accept and love can be prepared. Production cost is low; the technology is simple and feasible; raw materials are rich and easy to purchase and have no toxic or side effect; regimen and treatment effects are s