Amino acid brain tonic, is it true or false, you guess?

Various brain tonic products are popular in the market, among which amino acids have become popular "brain tonic health products" There was a media report that a senior three student in a senior high school played an amino acid bottle to "nourish the brain", so can amino acids really nourish the brain?
What is amino acid? The word amino acid sounds very professional, so many parents can't believe it when they face the word "tall and high" In fact, amino acids are the three major nutrients needed by the human body, responsible for the synthesis of proteins The DNA in the nucleus is first translated into RNA and secreted outside the nucleus (i.e inside the cytoplasm) Then, under the command of RNA, amino acids form polypeptide chains in a certain order, and then these polypeptide chains fold and curl continuously under the command to form macromolecular proteins Proteins participate in the formation of human body structure, and can play a biological activity in the body to complete basic life activities The human body can't absorb macromolecular protein After oral protein enters the intestine, it will hydrolyze to amino acid and then be absorbed by the human body
Can amino acids nourish the brain? "Improve sleep, improve immunity, enhance brain vitality" is the main selling point of amino acid products But none of these functions have been confirmed The brain has a high demand for energy Glucose, fat and protein are three major sources of energy However, when the human body has sufficient reserves, the human body will use glucose, fat and protein in order to supply energy Even if more amino acids are added and proteins are synthesized, the brain will preferentially use glucose for energy supply In addition, there is a barrier in the brain called blood brain barrier, which can effectively protect the exchange of materials between the brain and the outside world, so that some foreign materials can not easily enter the brain, reducing infection and brain damage Only small molecules or high liposoluble substances can enter the blood-brain barrier The active transport of amino acids through the blood-brain barrier has certain saturation When the carrier is saturated, the excess amino acids can not enter the brain It's like transporting goods Trucks can only transport one ton of goods into the factory, but there are two tons of goods outside the factory, so only one ton of goods can enter the factory
Even if it can't, it's OK to add more amino acids? Some people think that amino acids are substances in the body, even if there is no extra benefit, there is no harm in adding more amino acids Is that true? In fact, the amount of amino acids needed in the human body is relatively constant If the amount of amino acids added exceeds the amount needed by the human body, the human body will discharge the excess amino acids from the body, which will increase the burden on the kidney and liver In addition, amino acid injection is easy to cause pain and phlebitis at injection site due to its high osmotic pressure Therefore, amino acids are not recommended to be injected alone Generally, they need to be used together with parenteral fat emulsion, glucose, microelements, vitamins and other preparations for parenteral nutrition.