Nervous acid, also known as shark acid, is an unsaturated fatty acid with 24 carbon atoms and 1 double bond that exists in nerve tissue and fish oil. It is named after it was first discovered in shark brain. It is a component of cerebroside with a melting point of 42 °C. Mainly derived from shark brain and shark oil. Developed countries hunt and kill sharks in large numbers in order to obtain nervonic acid. With international organizations calling for a ban on shark fishing, nervonic acid resources are in short supply. Countries such as Europe and the United States attach great importance to the discovery of nervonic acid from plants, and preliminary results have been achieved. Nervous acid is recognized by scientists from all over the world as the world's first and only dual-effect miraculous substance that can repair and unblock damaged nerve pathways in the brain -- nerve fibers, and promote nerve cell regeneration. Nervous acid is the core natural component of nerve fibers and nerve cells in the brain. The lack of nervonic acid will cause cerebral diseases such as stroke sequelae, senile dementia, cerebral palsy, brain atrophy, memory loss, insomnia and forgetfulness. Nervous acid is difficult to generate by the human body itself, and can only be supplemented by external intake.