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People who, in preparation for exams or competitive examinations, need to reason clearly and increase their ability to stay focused. People who require great mental effort due to the pace of life, work, and/or age. Phosphoserine is the phosphorylated amino acid serine. Serine is one of the 20 amino acids in animal proteins. It forms part of cell membranes and is involved in cell proliferation. It also contains the amino acids L-Glutamine and L-Asparagine, which, together with phosphoserine, act at the brain level. Vitamin B6 contributes to normal psychological function, normal energy-yielding metabolism, and helps reduce tiredness and fatigue.