In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons) is a polyhedron composed of four triangular faces, three of which meet at each corner or vertex. It has six edges and four vertices. The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces. The tetrahedron is the three-dimensional case of the more general concept of a Euclidean simplex.
Research shows that B vitamins improve memory by creating a protective shield for the neurons in the brain. B vitamins break down homocysteine, which is an amino acid that is a toxic poison to nerve cells. These vitamins also aid in the production of red blood cells, which carry oxygen, an important brain nutrient. The most important B vitamins for memory include B6, B12, and Folic Acid (B9).
In fact, each B vitamin plays its own role in preserving brain function and mental acuity. Starting from folic acid (a B complex), which helps in the early brain development, these vitamins help in many aspects of metabolism. A few recent studies have shown a link between declines in memory and Alzheimer's disease in the elderly and inadequate levels of folic acid, vitamin B12, and vitamin B6.